Basic constructs i
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The document discusses basic constructs in the Go programming language including filenames, identifiers, keywords, functions, function formatting, parameters, comments, and references. Filenames can contain lowercase letters and underscores but no spaces or special characters. Identifiers are case-sensitive and begin with a letter or underscore followed by letters or digits. Go has 25 reserved keywords. Functions are declared with the func keyword followed by the name and parameters in parentheses. Functions must have a main function and braces enclose the body. Comments can be single line with // or multiline between /* and */.
Basic constructs i
- 1. Development with Go - Manjitsing K. Valvi
- 2. Basic constructs 1. Filenames ● Lower case letters ● ‘_’ allowed ● spaces or any other special characters not allowed
- 3. Basic constructs 2. Identifiers ● Case-sensitive ● begin with a letter (a letter is every letter in Unicode UTF-8 or _ ), ● followed by 0 or more letters or Unicode digits ○ like: X56, group1, _x23, i, өԑ12 ● Keywords and operators not allowed ● ‘_’ : the blank identifier ● Sometimes variables, types or functions have no name
- 4. Basic constructs 3. Keywords ● 25 keywords or reserved words in GO ● kept deliberately small to simplify the code-parsing ● A keyword cannot be used as an identifier
- 5. Basic constructs Functions ● format: func functionName() ● no, one, or more parameters (separated by , ) can be given as input to the function inside parentheses ● A main function as starting is required ● main has no parameters and no return type ● Function body is enclosed between braces: { } ● The first { must be on the same line as the func-declaration ○ imposed by the compiler and gofmt ● The last } is positioned after the function-code in the column beneath function ● Name PasalCasing => to be used outside function
- 6. Basic constructs Functions - format func functionName(parameter_list) (return_value_list) { ... } where parameter_list is of the form (param1 type1, param2 type2, ...) and return_value_list is of the form (ret1 type1, ret2 type2, ...)
- 7. Basic constructs Comments ● One line : // ● Block : /* … */ ● a package comment, provides information relevant to the package and its functionality as a whole (using godoc)
- 8. Installation (shown for Windows) Download the installer of GO and follow the steps
- 10. STEP 3 STEP 4
- 11. STEP 5 STEP 6
- 13. References ● “The Way to Go: A Thorough Introduction to the Go Programming Language”, Ivo Balbaert ● “The Go Programming Language”, Alan Donovan, Brian Kernighan, Addison-Wesley