163 lines
4.6 KiB
Plaintext
163 lines
4.6 KiB
Plaintext
== Keywords
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The following keywords are used by Ruby.
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__ENCODING__::
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The script encoding of the current file. See Encoding.
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__LINE__::
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The line number of this keyword in the current file.
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__FILE__::
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The path to the current file.
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BEGIN::
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Runs before any other code in the current file. See {miscellaneous
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syntax}[rdoc-ref:syntax/miscellaneous.rdoc]
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END::
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Runs after any other code in the current file. See {miscellaneous
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syntax}[rdoc-ref:syntax/miscellaneous.rdoc]
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alias::
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Creates an alias between two methods (and other things). See {modules and
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classes syntax}[rdoc-ref:syntax/modules_and_classes.rdoc]
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and::
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Short-circuit Boolean and with lower precedence than <code>&&</code>
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begin::
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Starts an exception handling block. See {exceptions
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syntax}[rdoc-ref:syntax/exceptions.rdoc]
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break::
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Leaves a block early. See {control expressions
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syntax}[rdoc-ref:syntax/control_expressions.rdoc]
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case::
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Starts a +case+ expression. See {control expressions
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syntax}[rdoc-ref:syntax/control_expressions.rdoc]
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class::
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Creates or opens a class. See {modules and classes
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syntax}[rdoc-ref:syntax/modules_and_classes.rdoc]
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def::
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Defines a method. See {methods syntax}[rdoc-ref:syntax/methods.rdoc]
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defined?::
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Returns a string describing its argument. See {miscellaneous
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syntax}[rdoc-ref:syntax/miscellaneous.rdoc]
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do::
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Starts a block.
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else::
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The unhandled condition in +case+, +if+ and +unless+ expressions. See
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{control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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elsif::
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An alternate condition for an +if+ expression. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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end::
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The end of a syntax block. Used by classes, modules, methods, exception
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handling and control expressions.
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ensure::
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Starts a section of code that is always run when an exception is raised.
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See {exception handling}[rdoc-ref:syntax/exceptions.rdoc]
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false::
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Boolean false. See {literals}[rdoc-ref:syntax/literals.rdoc]
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for::
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A loop that is similar to using the +each+ method. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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if::
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Used for +if+ and modifier +if+ statements. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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in::
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Used to separate the iterable object and iterator variable in a +for+ loop.
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See {control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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It also serves as a pattern in a +case+ expression.
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See {pattern matching}[rdoc-ref:syntax/pattern_matching.rdoc]
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module::
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Creates or opens a module. See {modules and classes
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syntax}[rdoc-ref:syntax/modules_and_classes.rdoc]
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next::
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Skips the rest of the block. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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nil::
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A false value usually indicating "no value" or "unknown". See
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{literals}[rdoc-ref:syntax/literals.rdoc]
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not::
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Inverts the following boolean expression. Has a lower precedence than
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<code>!</code>
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or::
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Boolean or with lower precedence than <code>||</code>
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redo::
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Restarts execution in the current block. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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rescue::
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Starts an exception section of code in a +begin+ block. See {exception
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handling}[rdoc-ref:syntax/exceptions.rdoc]
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retry::
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Retries an exception block. See {exception
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handling}[rdoc-ref:syntax/exceptions.rdoc]
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return::
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Exits a method. See {methods}[rdoc-ref:syntax/methods.rdoc].
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If met in top-level scope, immediately stops interpretation of
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the current file.
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self::
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The object the current method is attached to. See
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{methods}[rdoc-ref:syntax/methods.rdoc]
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super::
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Calls the current method in a superclass. See
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{methods}[rdoc-ref:syntax/methods.rdoc]
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then::
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Indicates the end of conditional blocks in control structures. See
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{control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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true::
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Boolean true. See {literals}[rdoc-ref:syntax/literals.rdoc]
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undef::
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Prevents a class or module from responding to a method call.
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See {modules and classes}[rdoc-ref:syntax/modules_and_classes.rdoc]
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unless::
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Used for +unless+ and modifier +unless+ statements. See {control
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expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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until::
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Creates a loop that executes until the condition is true. See
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{control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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when::
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A condition in a +case+ expression. See
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{control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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while::
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Creates a loop that executes while the condition is true. See
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{control expressions}[rdoc-ref:syntax/control_expressions.rdoc]
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yield::
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Starts execution of the block sent to the current method. See
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{methods}[rdoc-ref:syntax/methods.rdoc]
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