Tuesday, February 26th, 2008
JavaScript Functional Pattern Matching
Category: JavaScript
Take a look at the examples such as writing a factorial via matching:
JAVASCRIPT:
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function fact (n) {
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return m.match(n,
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[
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[ 0 , function ( ) { return 1 }],
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[ _("n"), function (a) { return (a.n * fact(a.n -1)) }]
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]);
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}
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or working with complex structures:
JAVASCRIPT:
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function go_deep(ob) {
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return m.match(ob,
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[
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[{foo:{bar:{baz:'foo'}}, baz:_('b')}, function (a) { return a.b }],
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[_('_') , function ( ) { return null }]
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]);
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}
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When is this useful? Adrien is "sure some genius out there would find a cool use for it : dom navigation ? input validation ? json validation ? you name it :)"
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