W

W (nonword) regexp character class, Regular Expression Syntax

w (word) regexp character class, Regular Expression Syntax

“w” (writing) file mode, Opening files

-w command-line option, Common Options

-W command-line option, Warnings and Information Options

“w+” (writing and reading) file mode, Opening files

-W0 command-line option, Warnings and Information Options

-W2 command-line option, Warnings and Information Options

weak reference objects, ObjectSpace and GC

when keyword, case

while keyword, Operators

while loops, Blocks and Iterators, Expressions and Operators in Ruby, while and until, while and until As Modifiers, retry

modifiers, as, while and until As Modifiers

retry statements and, retry

whitespace, Whitespace

with_index (Enumerable), Enumerators and external iterators

with_index method, Enumerators