Nix (language): Difference between revisions
imported>Vincentbernat "@" pattern captures all arguments, not only the extra ones |
imported>Pdinges m Fix minor typos. |
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==== Destructuring ==== | ==== Destructuring ==== | ||
In nix it happens that sets are given as arguments to functions. Say that we declare a function which returns the | In nix it happens that sets are given as arguments to functions. Say that we declare a function which returns the concatenation of attributes a and b of a set like: | ||
<syntaxHighlight lang=nix> | <syntaxHighlight lang=nix> | ||
concat_a_and_b = set: set.a + set.b | concat_a_and_b = set: set.a + set.b | ||
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==== <code>let ... in</code> statement ==== | ==== <code>let ... in</code> statement ==== | ||
With <code>let</code> you can define local variables which can also reference to self without the need of the <code>rec</code> construct. This feature is | With <code>let</code> you can define local variables which can also reference to self without the need of the <code>rec</code> construct. This feature is used inside expressions to prepare variables which become part of an output. | ||
The usage of <code>let</code> is comparable to the [http://zvon.org/other/haskell/Outputsyntax/letQexpressions_reference.html Haskell let expression] | The usage of <code>let</code> is comparable to the [http://zvon.org/other/haskell/Outputsyntax/letQexpressions_reference.html Haskell let expression] | ||
<syntaxHighlight lang=nix> | <syntaxHighlight lang=nix> | ||