jQuery Arrays — a practical guide to jQuery arrays map grep with clear examples you can reuse in real projects.
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Short description
Modern JS array methods often replace these helpers.
Array helpers
var doubled = $.map([1, 2, 3], function (n) { return n * 2; });
var evens = $.grep([1, 2, 3, 4], function (n) { return n % 2 === 0; });