Active Support Improvements in Rails 5
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The document discusses several improvements and additions to date, time, and array methods in Ruby. Some key improvements include adding methods like days_in_month and days_in_year to the Time class to get the number of days in a given month or year. For arrays, new methods like pluck, without, third_to_last, second_to_last, positive?, and negative? are added. A new ArrayInquirer class is also introduced that adds question-style methods like any? to arrays.
![©2014
• days_in_year
class Time
include DateAndTime::Calculations
COMMON_YEAR_DAYS_IN_MONTH = [nil, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
class << self
# Returns the number of days in the given month.
# If no year is specified, it will use the current year.
def days_in_month(month, year = current.year)
if month == 2 && ::Date.gregorian_leap?(year)
29
else
COMMON_YEAR_DAYS_IN_MONTH[month]
end
end
# Returns the number of days in the given year.
# If no year is specified, it will use the current year.
def days_in_year(year = current.year)
days_in_month(2, year) + 337
end
end
end
Improvements in Date, Time and DateTime](https://image.slidesharecdn.com/am-chennairb-160331065556/85/Active-Support-Improvements-in-Rails-5-3-320.jpg)
![©2014
• Pluck ( https://goo.gl/yjuBki )
module Enumerable
# Convert an enumerable to an array based on the given key.
#
# [{ name: "David" }, { name: "Rafael" }, { name: "Aaron" }].pluck(:name)
# => ["David", "Rafael", "Aaron"]
#
# [{ id: 1, name: "David" }, { id: 2, name: "Rafael" }].pluck(:id, :name)
# => [[1, "David"], [2, "Rafael"]]
def pluck(*keys)
if keys.many?
map { |element| keys.map { |key| element[key] } }
else
map { |element| element[keys.first] }
end
end
end](https://image.slidesharecdn.com/am-chennairb-160331065556/85/Active-Support-Improvements-in-Rails-5-4-320.jpg)
![©2014
• Without ( https://goo.gl/etJN7h )
class Array
# Returns a copy of the Array without the specified elements.
#
# people = ["David", "Rafael", "Aaron", "Todd"]
# people.without "Aaron", "Todd"
# => ["David", "Rafael"]
#
# Note: This is an optimization of `Enumerable#without` that uses `Array#-`
# instead of `Array#reject` for performance reasons.
def without(*elements)
self - elements
end
end](https://image.slidesharecdn.com/am-chennairb-160331065556/85/Active-Support-Improvements-in-Rails-5-5-320.jpg)
![©2014
• second_to_last (https://goo.gl/Ig0pOY )
• third_to_last
class Array
# Equal to <tt>self[-3]</tt>.
#
# %w( a b c d e ).third_to_last # => "c"
def third_to_last
self[-3]
end
# Equal to <tt>self[-2]</tt>.
#
# %w( a b c d e ).second_to_last # => "d"
def second_to_last
self[-2]
end
end](https://image.slidesharecdn.com/am-chennairb-160331065556/85/Active-Support-Improvements-in-Rails-5-6-320.jpg)
![©2014
• Inquiry ( https://goo.gl/47bjv7 , https://goo.gl/QpVmU3 )
class ArrayInquirer < Array
def any?(*candidates, &block)
if candidates.none?
super
else
candidates.any? do |candidate|
include?(candidate) || include?(candidate.to_sym)
end
end
end
private
def respond_to_missing?(name, include_private = false)
name[-1] == '?'
end
def method_missing(name, *args)
if name[-1] == '?'
any?(name[0..-2])
else
super
end
end
end](https://image.slidesharecdn.com/am-chennairb-160331065556/85/Active-Support-Improvements-in-Rails-5-8-320.jpg)
Active Support Improvements in Rails 5
- 2. ©2014 • https://goo.gl/ZTl8oO • prev_day • next_day • on_weekend • on_weekday • next_weekday • prev_weekday • prev_week(same_time: true) • next_week(same_time: true) Improvements in Date, Time and DateTime
- 3. ©2014 • days_in_year class Time include DateAndTime::Calculations COMMON_YEAR_DAYS_IN_MONTH = [nil, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31] class << self # Returns the number of days in the given month. # If no year is specified, it will use the current year. def days_in_month(month, year = current.year) if month == 2 && ::Date.gregorian_leap?(year) 29 else COMMON_YEAR_DAYS_IN_MONTH[month] end end # Returns the number of days in the given year. # If no year is specified, it will use the current year. def days_in_year(year = current.year) days_in_month(2, year) + 337 end end end Improvements in Date, Time and DateTime
- 4. ©2014 • Pluck ( https://goo.gl/yjuBki ) module Enumerable # Convert an enumerable to an array based on the given key. # # [{ name: "David" }, { name: "Rafael" }, { name: "Aaron" }].pluck(:name) # => ["David", "Rafael", "Aaron"] # # [{ id: 1, name: "David" }, { id: 2, name: "Rafael" }].pluck(:id, :name) # => [[1, "David"], [2, "Rafael"]] def pluck(*keys) if keys.many? map { |element| keys.map { |key| element[key] } } else map { |element| element[keys.first] } end end end
- 5. ©2014 • Without ( https://goo.gl/etJN7h ) class Array # Returns a copy of the Array without the specified elements. # # people = ["David", "Rafael", "Aaron", "Todd"] # people.without "Aaron", "Todd" # => ["David", "Rafael"] # # Note: This is an optimization of `Enumerable#without` that uses `Array#-` # instead of `Array#reject` for performance reasons. def without(*elements) self - elements end end
- 6. ©2014 • second_to_last (https://goo.gl/Ig0pOY ) • third_to_last class Array # Equal to <tt>self[-3]</tt>. # # %w( a b c d e ).third_to_last # => "c" def third_to_last self[-3] end # Equal to <tt>self[-2]</tt>. # # %w( a b c d e ).second_to_last # => "d" def second_to_last self[-2] end end
- 7. ©2014 • positive? (https://goo.gl/UsTnWl ) • negative? class Integer # Returns true if the number is positive. # # 1.positive? # => true # 0.positive? # => false # -1.positive? # => false def positive? self > 0 end # Returns true if the number is negative. # # -1.positive? # => true # 0.positive? # => false # 1.positive? # => false def negative? self < 0 end end
- 8. ©2014 • Inquiry ( https://goo.gl/47bjv7 , https://goo.gl/QpVmU3 ) class ArrayInquirer < Array def any?(*candidates, &block) if candidates.none? super else candidates.any? do |candidate| include?(candidate) || include?(candidate.to_sym) end end end private def respond_to_missing?(name, include_private = false) name[-1] == '?' end def method_missing(name, *args) if name[-1] == '?' any?(name[0..-2]) else super end end end
- 9. ©2014 Q&A ? Question and Answers
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