STDERR

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The standard error output. The default value for $stderr

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Special constants in Ruby:

*Special Constants in Ruby

*FILE

*dir

*PROGRAM NAME or 0

*

*etc

*ARGV or

*STDIN

*STDOUT

*STDERR

*stderr

*stdout

*stdin

*ENV

Table Of Contents

0Getting started

1Casting type conversions

2Arrays

3Classes

4Hashes

5Blocks and procs and lambdas

6Inheritance

7Control flow

8Strings

9Symbols

10Exceptions

11Thread

12Methods

13Method missing

14Numbers

15Iteration

16Regular Expressions and regex based operations

17Comparable

18Gem usage

19Design patterns and idioms

20Loading source files

21Range

22Comments

23Operators

24Operators

25Special constants in Ruby

26Modules

27Ruby version manager

28Gem creation / management

29Constants

30Variable scope and visibility

31rbenv

32Environment variables

33Singletons

34File I/O

35Time

36Queue

37Destructuring

38IRB

39Enumerators

40C extensions

41Struct

42Metaprogramming

43Dynamic evaluation

44instance eval

45Message passing

46Keyword arguments

47DateTime

48Truthiness

49JSON with Ruby

50Implicit receives, understanding

51Monkey patching

52Introspection

53Monkey patching

54Refinements

55Monkey patching in Ruby

56Catching exceptions with begin rescue

57Command line apps

58Debugging

59Pure RSpec JSON API testing

60Recursion

61Installation

62ERB

63Introspection

64Random numbers

65Getting started with Hanami

66OptionParser

67Splat operator

68Multidimensional Arrays

69Enumerable

70Ruby access modifiers

71Operating system or shell commands

72Contributors