45 lines
1.3 KiB
JavaScript
45 lines
1.3 KiB
JavaScript
var baseIteratee = require('./_baseIteratee'),
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baseWhile = require('./_baseWhile');
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/**
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* Creates a slice of `array` with elements taken from the beginning. Elements
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* are taken until `predicate` returns falsey. The predicate is invoked with
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* three arguments: (value, index, array).
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*
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* @static
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* @memberOf _
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* @since 3.0.0
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* @category Array
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* @param {Array} array The array to query.
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* @param {Function} [predicate=_.identity] The function invoked per iteration.
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* @returns {Array} Returns the slice of `array`.
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* @example
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*
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* var users = [
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* { 'user': 'barney', 'active': false },
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* { 'user': 'fred', 'active': false },
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* { 'user': 'pebbles', 'active': true }
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* ];
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*
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* _.takeWhile(users, function(o) { return !o.active; });
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* // => objects for ['barney', 'fred']
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*
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* // The `_.matches` iteratee shorthand.
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* _.takeWhile(users, { 'user': 'barney', 'active': false });
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* // => objects for ['barney']
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*
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* // The `_.matchesProperty` iteratee shorthand.
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* _.takeWhile(users, ['active', false]);
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* // => objects for ['barney', 'fred']
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*
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* // The `_.property` iteratee shorthand.
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* _.takeWhile(users, 'active');
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* // => []
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*/
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function takeWhile(array, predicate) {
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return (array && array.length)
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? baseWhile(array, baseIteratee(predicate, 3))
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: [];
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}
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module.exports = takeWhile;
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