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45 lines
1.3 KiB
45 lines
1.3 KiB
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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