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React and React Native
Copyright © 2024 Packt Publishing
All rights reserved. No part of this book may be reproduced, stored in a
retrieval system, or transmitted in any form or by any means, without the
prior written permission of the publisher, except in the case of brief
quotations embedded in critical articles or reviews.
Every effort has been made in the preparation of this book to ensure the
accuracy of the information presented. However, the information contained in
this book is sold without warranty, either express or implied. Neither the
author, nor Packt Publishing, and its dealers and distributors will be held
liable for any damages caused or alleged to be caused directly or indirectly
by this book.
Packt Publishing has endeavored to provide trademark information about all
of the companies and products mentioned in this book by the appropriate use
of capitals. However, Packt Publishing cannot guarantee the accuracy of this
information.
Early Access Publication: React and React Native
Early Access Production Reference: B19636
Published by Packt Publishing Ltd.
Livery Place
35 Livery Street
Birmingham
B3 2PB, UK
ISBN: 978-1-80512-730-7

Table of Contents
1. React and React Native, Fifth Edition: Build cross-platform JavaScript
and TypeScript apps for the web, desktop, and mobile
2. 1 Why React?
I. Before you begin: Join our book community on Discord
II. What is React?
III. React is just the view layer
IV. Simplicity is good
V. Declarative UI structures
VI. Data changes over time
VII. Performance matters
VIII. The right level of abstraction
IX. What's new in React?
X. Setup a new React project
i. Using Web Bundlers
ii. Using Frameworks
iii. Online Code Editors
XI. Summary
3. 2 Rendering with JSX
II. Technical requirements
III. Your first JSX content
i. Hello JSX
ii. Declarative UI structures
IV. Rendering HTML
i. Built-in HTML tags
ii. HTML tag conventions
iii. Describing UI structures
V. Creating your own JSX elements
i. Encapsulating HTML
ii. Nested elements
iii. Namespaced components
VI. Using JavaScript expressions
i. Dynamic property values and text

ii. Handling events
iii. Mapping collections to elements
VII. Building fragments of JSX
i. Using wrapper elements
ii. Using fragments
VIII. Summary
4. 3 Understanding React Components and Hooks
III. Introduction to React Components
IV. What are component properties?
i. Passing property values
ii. Default property values
V. What is component state?
VI. React Hooks
VII. Maintaining state using Hooks
i. Initial state values
ii. Updating state values
VIII. Performing initialization and cleanup actions
i. Fetching component data
ii. Canceling actions and resetting state
iii. Optimizing side-effect actions
IX. Sharing data using context Hooks
X. Memoization with Hooks
i. useMemo Hook
ii. useCallback Hook
iii. useRef Hook
XI. Summary
5. 4 Event Handling, the React Way
III. Declaring event handlers
i. Declaring handler functions
ii. Multiple event handlers
IV. Declaring inline event handlers
V. Binding handlers to elements
VI. Using synthetic event objects

VII. Understanding event pooling
VIII. Summary
6. 5 Crafting Reusable Components
III. Reusable HTML elements
IV. The difficulty with monolithic components
i. The JSX markup
ii. Initial state
iii. Event handler implementation
V. Refactoring component structures
i. Starting with the JSX
ii. Implementing an article list component
iii. Implementing an article item component
iv. Implementing an add article component
VI. Render props
VII. Rendering component trees
VIII. Feature components and utility components
IX. Summary
7. 6 Type Checking and Validation with TypeScript
III. Knowing What to Expect
i. The Importance of Props Validation
ii. Potential Issues Without Proper Validation
iii. Options for Props Validation
IV. Introduction to TypeScript
i. Why Use TypeScript?
ii. Setting Up TypeScript in a Project
iii. Basic Types in TypeScript
iv. Interfaces and Type Aliases
V. Comparing PropTypes and TypeScript
VI. Using TypeScript in React
i. Type Checking Props in React Components
ii. Typing State
iii. Typing Event Handlers
iv. Typing Context

v. Typing Refs
VII. Summary
8. 7 Handling Navigation with Routes
III. Declaring routes
i. Hello route
ii. Decoupling route declarations
IV. Handling route parameters
i. Resource IDs in routes
ii. Query parameters
V. Using link components
i. Basic linking
ii. URL and query parameters
VI. Summary
9. 8 Code Splitting Using Lazy Components and Suspense
III. Using the lazy API
i. Dynamic imports and bundles
ii. Making components lazy
IV. Using the Suspense component
i. Top-level Suspense components
ii. Working with spinner fallbacks
V. Avoiding lazy components
VI. Exploring lazy pages and routes
VII. Summary
10. 9 User Interface Framework Components
III. Layout and organization
i. Using containers
ii. Building responsive grid layouts
IV. Using navigation components
i. Navigating with drawers
ii. Navigating with tabs
V. Collecting user input

i. Checkboxes and radio buttons
ii. Text inputs and select inputs
iii. Working with buttons
VI. Working with styles and themes
i. Making styles
ii. Customizing themes
VII. Summary
11. 10 High-Performance State Updates
III. Batching state updates
IV. Prioritizing state updates
V. Handling asynchronous state updates
VI. Summary
12. 15 Why React Native?
III. What is React Native?
IV. React and JSX are familiar
V. The mobile browser experiences
VI. Android and iOS – different yet the same
VII. The case for mobile web apps
VIII. Summary
13. 16 React Native under the Hood
III. Exploring React Native architecture
i. The state of web and mobile apps in the past
ii. React Native current architecture
iii. React Native future architecture
IV. Explaining JS and Native modules
i. React Navigation
ii. UI component libraries
iii. Splash screen
iv. Icons
v. Handling errors
vi. Push notifications

vii. Over the air updates
viii. JS libraries
V. Exploring React Native components and APIs
VI. Summary
14. 17 Kick-Starting React Native Projects
III. Exploring React Native CLI tools
IV. Installing and using the Expo command-line tool
V. Viewing your app on your phone
VI. Viewing your app on Expo Snack
VII. Summary
15. 18 Building Responsive Layouts with Flexbox
III. Introducing Flexbox
IV. Introducing React Native styles
V. Using the Styled Components library
VI. Building Flexbox layouts
i. Simple three-column layout
ii. Improved three-column layout
iii. Flexible rows
iv. Flexible grids
v. Flexible rows and columns
VII. Summary
16. 19 Navigating Between Screens
III. Navigation basics
IV. Route parameters
V. The navigation header
VI. Tab and drawer navigation
VII. File-based navigation
VIII. Summary
17. 20 Rendering Item Lists

III. Rendering data collections
IV. Sorting and filtering lists
V. Fetching list data
VI. Lazy list loading
VII. Implementing pull to refresh
VIII. Summary
18. 21 Showing Progress
III. Understanding progress and usability
IV. Indicating progress
V. Measuring progress
VI. Exploring navigation indicators
VII. Step progress
VIII. Summary
19. 22 Geolocation and Maps
III. Using Location API
IV. Rendering the Map
V. Annotating points of interest
i. Plotting points
ii. Plotting overlays
VI. Summary
20. 23 Collecting User Input
III. Collecting text input
IV. Selecting from a list of options
V. Toggling between on and off
VI. Collecting date/time input
VII. Summary
21. 24 Displaying Modal Screens
III. Important information
IV. Getting user confirmation

i. Displaying a success confirmation
V. Error confirmation
VI. Passive notifications
VII. Activity modals
VIII. Summary
22. 25 Responding to User Gestures
III. Scrolling with your fingers
IV. Giving touch feedback
V. Using Swipeable and cancellable components
VI. Summary
23. 26 Using Animations
III. Using React Native Reanimated
i. Animated API
ii. React Native Reanimated
IV. Installing the React Native Reanimated library
V. Animating layout components
VI. Animating styling components
VII. Summary
24. 27 Controlling Image Display
III. Loading images
IV. Resizing images
V. Lazy image loading
VI. Rendering icons
VII. Summary
25. 29 Selecting Native UI Components Using Tamagui
III. Application containers
IV. Headers and footers
V. Using layout components
VI. Collecting input using form components

VII. Summary
VIII. Further reading

React and React Native, Fifth
Edition: Build cross-platform
JavaScript and TypeScript apps for
the web, desktop, and mobile
Welcome to Packt Early Access. We’re giving you an exclusive preview of
this book before it goes on sale. It can take many months to write a book, but
our authors have cutting-edge information to share with you today. Early
Access gives you an insight into the latest developments by making chapter
drafts available. The chapters may be a little rough around the edges right
now, but our authors will update them over time.You can dip in and out
of this bookor follow alongfrom start to finish; Early Access is designed to
be flexible. We hope you enjoy getting to know more about the process of
writing a Packt book.
1. Chapter 1: Why React?
2. Chapter 2: Rendering with JSX
3. Chapter 3: Understanding React Components and Hooks
4. Chapter 4: Event Handling, the React Way
5. Chapter 5: Crafting Reusable Components
6. Chapter 6: Type Checking and Validation with TypeScript
7. Chapter 7: Handling Navigation with Routes
8. Chapter 8: Code Splitting Using Lazy Components and Suspense
9. Chapter 9: User Interface Framework Components
10. Chapter 10: High-Performance State Updates
11. Chapter 11: User Interface Framework Components
12. Chapter 12: High-Performance State Updates
13. Chapter 13: Unit Testing in React
14. Chapter 14: Server Rendering and Static Site Generation with React
Frameworks
15. Chapter 15: Why React Native?

16. Chapter 16: React Native under the Hood
17. Chapter 17: Kick-Starting React Native Projects
18. Chapter 18: Building Responsive Layouts with Flexbox
19. Chapter19: Navigating Between Screens
20. Chapter20: Rendering Item Lists
21. Chapter 21: Showing Progress
22. Chapter 22: Geolocation and Maps
23. Chapter 23: Collecting User Input
24. Chapter 24: Displaying Modal Screens
25. Chapter 25: Responding to User Gestures
26. Chapter 26: Using Animations
27. Chapter 27: Controlling Image Display
28. Chapter 28: Going Offline
29. Chapter 29: Selecting Native UI Components Using Tamagui

Another random document with
no related content on Scribd:

Broward sat down by Ingrid Nashdoi. She was a short dark and petite
woman of about thirty-three. Not very good-looking but, usually,
witty and vivacious. Now, she stared at the floor, her face frozen.
"I'm sorry about Jim," he said. "But we don't have time to grieve
now. Later, perhaps."
She did not look at him but replied in a low halting voice. "He may
have been dead before the war started. I never even got to say
goodbye to him. You know what that means. What it probably did
mean."
"I don't think they got anything out of him. Otherwise, you and I
would have been arrested, too."
He jerked his head towards Scone and said, "He doesn't know you're
one of us. I want him to think you're a candidate for the Nationalists.
After this struggle with the Russ is over, we may need someone who
can report on him. Think you can do it?"
She nodded her head, and Broward returned to Scone. "She hates
the Russians," he said. "You know they took her husband away. She
doesn't know why. But she hates Ivan's guts."
"Good. Ah, here we go."
After the destroyer had berthed at Clavius, and the three entered the
base, events went swiftly if not smoothly. Scone talked to the entire
personnel over the IP, told them what had happened. Then he went
to his office and issued orders to have the arsenal cleaned out of all
portable weapons. These were transferred to the four destroyers the
Russians had assigned to Clavius as a token force.
Broward then called in his four Athenians and Scone, his five
Nationalists. The situation was explained to them, and they were

informed of what was expected of them. Even Broward was startled,
but didn't protest.
After the weapons had been placed in the destroyers, Scone ordered
the military into his office one at a time. And, one at a time, they
were disarmed and escorted by another door to the arsenal and
locked in. Three of the soldiers asked to join Scone, and he accepted
two. Several protested furiously and denounced Scone as a traitor.
Then, Scone had the civilians assembled in the large auditorium.
(Technically, all personnel were in the military, but the scientists were
only used in that capacity during emergencies.) Here, he told them
what he had done, what he planned to do—except for one thing—
and asked them if they wished to enlist. Again, he got a violent
demonstration from some and sullen silence from others. These were
locked up in the arsenal.
The others were sworn in, except for one man, Whiteside. Broward
pointed him out as an agent and informer for both the Russians and
Chinese. Scone admitted that he had not known about the triple-
dealer, but he took Broward's word and had Whiteside locked up, too.
Then, the radios of the two scout ships were smashed, and the
prisoners marched out and jammed into them. Scone told them they
were free to fly to the Russian base. Within a few minutes, the scouts
hurtled away from Clavius towards the north.
"But, Colonel," said Broward, "they can't give the identifying code to
the Russians. They'll be shot down."
"They are traitors; they prefer the Russky to us. Better for us if they
are shot down. They'll not fight for Ivan."
Broward did not have much appetite when he sat down to eat and to
listen to Scone's detailing of his plan.
"The Zemlya," he said, "has everything we need to sustain us here.
And to clothe the Earth with vegetation and replace her animal life in
the distant future when the radiation is low enough for us to return.
Her deepfreeze tanks contain seeds and plants of thousands of

different species of vegetation. They also hold, in suspended
animation, the bodies of cattle, sheep, horses, rabbits, dogs, cats,
fowl, birds, useful insects and worms. The original intention was to
reanimate these and use them on any Terrestrial-type planet the
Zemlya might find.
"Now, our bases here are self-sustaining. But, when the time comes
to return to Earth, we must have vegetation and animals. Otherwise,
what's the use?
"So, whoever holds the Zemlya holds the key to the future. We must
be the ones who hold that key. With it, we can bargain; the Russians
and the Chinese will have to agree to independence if they want to
share in the seeds and livestock."
"What if the Zemlya's commander chooses destruction of his vessel
rather than surrender?" said Broward. "Then, all of humanity will be
robbed. We'll have no future."
"I have a plan to get us aboard the Zemlya without violence."
An hour later, the four USAF destroyers accelerated outwards towards
Earth. Their radar had picked up the Zemlya; it also had detected five
other Unidentified Space Objects. These were the size of their own
craft.
Abruptly, the Zemlya radioed that it was being attacked. Then,
silence. No answer to the requests from Eratosthenes for more
information.
Scone had no doubt about the attackers' identity. "The Axis leaders
wouldn't have stayed on Earth to die," he said. "They'll be on their
way to their big base on Mars. Or, more likely, they have the same
idea as us. Capture the Zemlya."
"And if they do?" said Broward.
"We take it from them."

The four vessels continued to accelerate in the great curve which
would take them out away from the Zemlya and then would bring
them around towards the Moon again. Their path was computed to
swing them around so they would come up behind the interstellar
ship and overtake it. Though the titanic globe was capable of
eventually achieving far greater speeds than the destroyers, it was
proceeding at a comparatively slow velocity. This speed was
determined by the orbit around the Moon into which the Zemlya
intended to slip.
In ten hours, the USAF complement had curved around and were
about 10,000 kilometers from the Zemlya. Their speed was
approximately 20,000 kilometers an hour at this point, but they were
decelerating. The Moon was bulking larger; ahead of them, visible by
the eye, were two steady gleams. The Zemlya and the only Axis
vessel which had not been blown to bits or sliced to fragments.
According to the Zemlya, which was again in contact with the Russian
base, the Axis ship had been cut in two by a tongue from Zemlya.
But the interstellar ship was now defenseless. It had launched every
missile and anti-missile in its arsenal. And the fuel for the tongue-
generators was exhausted.
"Furthermore," said Shaposhnikov, commander of the Zemlya, "new
USO has been picked up on the radar. Four coming in from Earth. If
these are also Axis, then the Zemlya has only two choices. Surrender.
Or destroy itself."
"There is nothing we can do," replied Eratosthenes. "But we do not
think those USO are Axis. We detected four destroyer-sized objects
leaving the vicinity of the USAF base, and we asked them for
identification. They did not answer, but we have reason to believe
they are North American."
"Perhaps they are coming to our rescue," suggested Shaposhnikov.
"They left before anyone knew you were being attacked. Besides,
they had no orders from us."
"What do I do?" said Shaposhnikov.

Scone, who had tapped into the tight laser beam, broke it up by
sending random pulses into it. The Zemlya discontinued its beam,
and Scone then sent them a message through a pulsed tongue which
the Russian base could tap into only through a wild chance.
After transmitting the proper code identification, Scone said, "Don't
renew contact with Eratosthenes. It is held by the Axis. They're trying
to lure you close enough to grab you. We escaped the destruction of
our base. Let me aboard where we can confer about our next step.
Perhaps, we may have to go to Alpha Centaurus with you."
For several minutes, the Zemlya did not answer. Shaposhnikov must
have been unnerved. Undoubtedly, he was in a quandary. In any
case, he could not prevent the strangers from approaching. If they
were Axis, they had him at their mercy.
Such must have been his reasoning. He replied, "Come ahead."
By then, the USAF dishes had matched their speeds to that of the
Zemlya's. From a distance of only a kilometer, the sphere looked like
a small Earth. It even had the continents painted on the surface,
though the effect was spoiled by the big Russian letters painted on
the Pacific Ocean.
Scone gave a lateral thrust to his vessel, and it nudged gently into
the enormous landing-port of the sphere. Within five minutes, his
crew of ten were in the control room.
Scone did not waste any time. He drew his gun; his men followed
suit; he told Shaposhnikov what he meant to do. The Russian, a tall
thin man of about fifty, seemed numbed. Perhaps, too many
catastrophes had happened in too short a time. The death of Earth,
the attack by the Axis ships, and, now, totally unexpected, this. The
world was coming to an end in too many shapes and too swiftly.
Scone cleared the control room of all Zemlya personnel except the
commander. The others were locked up with the forty-odd men and

women who were surprised at their posts by the Americans.
Scone ordered Shaposhnikov to set up orders to the navigational
computer for a new path. This one would send the Zemlya at the
maximum acceleration endurable by the personnel towards a point in
the south polar region near Clavius. When the Zemlya reached the
proper distance, it would begin a deceleration equally taxing which
would bring it to a halt approximately half a kilometer above the
surface at the indicated point.
Shaposhnikov, speaking disjointedly like a man coming up out of a
nightmare, protested that the Zemlya was not built to stand such a
strain. Moreover, if Scone succeeded in his plan to hide the great
globe at the bottom of a chasm under an overhang.... Well, he could
only predict that the lower half of the Zemlya would be crushed
under the weight—even with the Moon's weak gravity.
"That won't harm the animal tanks," said Scone. "They're in the
upper levels. Do as I say. If you don't, I'll shoot you and set up the
computer myself."
"You are mad," said Shaposhnikov. "But I will do my best to get us
down safely. If this were ordinary war, if we weren't man's—Earth's—
last hope, I would tell you to go ahead, shoot. But...."
Ingrid Nashdoi, standing beside Broward, whispered in a trembling
voice, "The Russian is right. He is mad. It's too great a gamble. If we
lose, then everybody loses."
"Exactly what Scone is betting on," murmured Broward. "He knows
the Russians and Chinese know it, too. Like you, I'm scared. If I
could have foreseen what he was going to do, I think I'd have put a
bullet in him back at Eratosthenes. But it's too late to back out now.
We go along with him no matter what."
The voyage from the Moon and the capture of the Zemlya had taken
twelve hours. Now, with the Zemlya's mighty drive applied—and the

four destroyers riding in the landing-port—the voyage back took three
hours. During this time, the Russian base sent messages. Scone
refused to answer. He intended to tell all the Moon his plans but not
until the Zemlya was close to the end of its path. When the globe
was a thousand kilometers from the surface, and decelerating with
the force of 3g's, he and his men returned to the destroyers. All
except three, who remained with Shaposhnikov.
The destroyers streaked ahead of the Zemlya towards an entrance to
a narrow canyon. This led downwards to a chasm where Scone
intended to place the Zemlya beneath a giant overhang.
But, as the four sped towards the opening two crags, their radar
picked up four objects coming over close to the mountains to the
north. A battlebird and three destroyers. Scone knew that the
Russians had another big craft and three more destroyers available.
But they probably did not want to send them out, too, and leave the
base comparatively defenseless.
He at once radioed the commander of the Lermontov and told him
what was going on.
"We declare independence, a return to Nationalism," he concluded.
"And we call on the other bases to do the same."
The commander roared, "Unless you surrender at once, we turn on
the bonephones! And you will writhe in pain until you die, you
American swine!"
"Do that little thing," said Scone, and he laughed.
He switched on the communication beams linking the four ships and
said, "Hang on for a minute or two, men. Then, it'll be all over. For us
and for them."
Two minutes later, the pain began. A stroke of heat like lightning that
seemed to sear the brains in their skulls. They screamed, all except

Scone, who grew pale and clutched the edge of the control panel.
But the dishes were, for the next two minutes, on automatic,
unaffected by their pilots' condition.
And then, just as suddenly as it had started, the pain died. They were
left shaking and sick, but they knew they would not feel that
unbearable agony again.
"Flutter your craft as if it's going out of control," said Scone. "Make it
seem we're crashing into the entrance to the canyon."
Scone himself put the lead destroyer through the simulation of a craft
with a pain-crazed pilot at the controls. The others followed his
maneuvers, and they slipped into the canyon.
From over the top of the cliff to their left rose a glare that would
have been intolerable if the plastic over the portholes had not
automatically polarized to dim the brightness.
Broward, looking through a screen which showed the view to the
rear, cried out. Not because of the light from the atomic bomb which
had exploded on the other side of the cliff. He yelled because the top
of the Zemlya had also lit up. And he knew in that second what had
happened. The light did not come from the warhead, for an
extremely high mountain was between the huge globe and the blast.
If the upper region of the Zemlya glowed, it was because a tongue
from a Russian ship had brushed against it.
It must have been an accident, for the Russians surely had no wish
to wreck the Zemlya. If they defeated the USAF, they could recapture
the globe with no trouble.
"My God, she's falling!" yelled Broward. "Out of control!"
Scone looked once and quickly. He turned away and said, "All craft
land immediately. All personnel transfer to my ship."

The maneuver took three minutes, for the men in the other dishes
had to connect air tanks to their suits and then run from their ships
to Scone's. Moreover, one man in each destroyer was later than his
fellows since he had to set up the controls on his craft.
Scone did not explain what he meant to do until all personnel had
made the transfer. In the meantime, they were at the mercy of the
Russians if the enemy had chosen to attack over the top of the cliff.
But Scone was gambling that the Russians would be too horrified at
what was happening to the Zemlya. His own men would have been
frozen if he had not compelled them to act. The Earth dying twice
within twenty-four hours was almost more than they could endure.
Only the American commander, the man of stone, seemed not to feel.
Scone took his ship up against the face of the cliff until she was just
below the top. Here the cliff was thin because of the slope on the
other side. And here, hidden from view of the Russians, he drove a
tongue two decimeters wide through the rock.
And, at the moment three Russian destroyers hurtled over the edge,
tongues of compressed light lashing out on every side in the classic
flailing movement, Scone's beam broke through the cliff.
The three empty USAF ships, on automatic, shot upwards at a speed
that would have squeezed their human occupants into jelly—if they
had had occupants. Their tongues shot out and flailed, caught the
Russian tongues, twisted, shot out and flailed, caught the Russian
tongues, twisted as the generators within the USAF vessels strove to
outbend the Russian tongues.
Then, the American vessels rammed into the Russians, drove them
upwards, flipped them over. And all six craft fell along the cliff's face,
Russian and American intermingled, crashing into each other,
bouncing off the sheer face, exploding, their fragments colliding, and
smashed into the bottom of the canyon.

Scone did not see this, for he had completed the tongue through the
tunnel, turned it off for a few seconds, and sent a video beam
through. He was just in time to see the big battlebird start to float off
the ground where it had been waiting. Perhaps, it had not
accompanied the destroyers because of Russian contempt for
American ability. Or, perhaps, because the commander was under
orders not to risk the big ship unless necessary. Even now, the
Lermontov rose slowly as if it might take two paths: over the cliff or
towards the Zemlya. But, as it rose, Scone applied full power.
Some one, or some detecting equipment, on the Lermontov must
have caught view of the tongue as it slid through space to intercept
the battlebird. A tongue shot out towards the American beam. But
Scone, in full and superb control, bent the axis of his beam, and the
Russian missed. Then Scone's was in contact with the hull, and a hole
appeared in the irradiated plastic.
Majestically, the Lermontov continued rising—and so cut itself almost
in half. And, majestically, it fell.
Not before the Russian commander touched off all the missiles
aboard his ship in a last frenzied defense, and the missiles flew out in
all directions. Two hit the slope, blew off the face of the mountain on
the Lermontov's side, and a jet of atomic energy flamed out through
the tunnel created by Scone.
But he had dropped his craft like an elevator, was halfway down the
cliff before the blasts made his side of the mountain tremble.
Half an hour later, the base of Eratosthenes sued for peace. For the
sake of human continuity, said Panchurin, all fighting must cease
forever on the moon.
The Chinese, who had been silent up to then despite their comrades'
pleas for help, also agreed to accept the policy of Nationalism.
Now, Broward expected Scone to break down, to give way to the
strain. He would only have been human if he had done so.
He did not. Not, at least, in anyone's presence.

Broward awoke early during a sleep-period. Unable to forget the
dream he had just had, he went to find Ingrid Nashdoi. She was not
in her lab; her assistant told him that she had gone to the dome with
Scone.
Jealous, Broward hurried there and found the two standing there and
looking up at the half-Earth. Ingrid was holding a puppy in her arms.
This was one of the few animals that had been taken unharmed from
the shattered tanks of the fallen Zemlya.
Broward, looking at them, thought of the problems that faced the
Moon people. There was that of government, though this seemed for
the moment to be settled. But he knew that there would be more
conflict between the bases and that his own promotion of the
Athenian ideology would cause grave trouble.
There was also the problem of women. One woman to every three
men. How would this be solved? Was there any answer other than
heartaches, frustration, hate, even murder?
"I had a dream," said Broward to them. "I dreamed that we on the
Moon were building a great tower which would reach up to the Earth
and that was our only way to get back to Earth. But everybody spoke
a different tongue, and we couldn't understand each other. Therefore,
we kept putting the bricks in the wrong places or getting into furious
but unintelligible argument about construction."
He stopped, saw they expected more, and said, "I'm sorry. That's all
there was. But the moral is obvious."
"Yes," said Ingrid, stroking the head of the wriggling puppy. She
looked up at Earth, close to the horizon. "The physicists say it'll be
two hundred years before we can go back. Do you realize that,
barring accident or war, all three of us might live to see that day?
That we might return with our great-great-great-great-great-great
grandchildren? And we can tell them of the Earth that was, so they
will know how to build the Earth that must be."

"Two hundred years?" said Broward. "We won't be the same persons
then."
But he doubted that even the centuries could change Scone. The
man was made of rock. He would not bend or flow. And then
Broward felt sorry for him. Scone would be a fossil, a true stone man,
a petrified hero. Stone had its time and its uses. But leather also had
its time.
"We'll never get back unless we do today's work every day," said
Scone. "I'll worry about Earth when it's time to worry. Let's go; we've
work to do."
THE END

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