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We are using only :: in a synopsis for fishscript examples given of the command being documented.
47 lines
1.5 KiB
ReStructuredText
47 lines
1.5 KiB
ReStructuredText
.. _cmd-for:
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for - perform a set of commands multiple times
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==============================================
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Synopsis
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--------
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**for** *VARNAME* in [*VALUES*...]; *COMMANDS*...; **end**
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Description
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-----------
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**for** is a loop construct. It will perform the commands specified by *COMMANDS* multiple times. On each iteration, the local variable specified by *VARNAME* is assigned a new value from *VALUES*. If *VALUES* is empty, *COMMANDS* will not be executed at all. The *VARNAME* is visible when the loop terminates and will contain the last value assigned to it. If *VARNAME* does not already exist it will be set in the local scope. For our purposes if the **for** block is inside a function there must be a local variable with the same name. If the **for** block is not nested inside a function then global and universal variables of the same name will be used if they exist.
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Much like :ref:`set <cmd-set>`, **for** does not modify $status, but the evaluation of its subordinate commands can.
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Example
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-------
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::
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for i in foo bar baz; echo $i; end
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# would output:
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foo
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bar
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baz
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Notes
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-----
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The ``VARNAME`` was local to the for block in releases prior to 3.0.0. This means that if you did something like this:
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::
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for var in a b c
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if break_from_loop
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break
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end
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end
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echo $var
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The last value assigned to ``var`` when the loop terminated would not be available outside the loop. What ``echo $var`` would write depended on what it was set to before the loop was run. Likely nothing.
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