60 lines
2.0 KiB
JavaScript
60 lines
2.0 KiB
JavaScript
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var baseCallback = require('../internal/baseCallback'),
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baseWhile = require('../internal/baseWhile');
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/**
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* Creates a slice of `array` excluding elements dropped from the beginning.
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* Elements are dropped until `predicate` returns falsey. The predicate is
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* bound to `thisArg` and invoked with three arguments: (value, index, array).
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*
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* If a property name is provided for `predicate` the created `_.property`
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* style callback returns the property value of the given element.
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*
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* If a value is also provided for `thisArg` the created `_.matchesProperty`
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* style callback returns `true` for elements that have a matching property
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* value, else `false`.
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*
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* If an object is provided for `predicate` the created `_.matches` style
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* callback returns `true` for elements that have the properties of the given
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* object, else `false`.
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*
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* @static
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* @memberOf _
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* @category Array
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* @param {Array} array The array to query.
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* @param {Function|Object|string} [predicate=_.identity] The function invoked
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* per iteration.
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* @param {*} [thisArg] The `this` binding of `predicate`.
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* @returns {Array} Returns the slice of `array`.
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* @example
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*
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* _.dropWhile([1, 2, 3], function(n) {
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* return n < 3;
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* });
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* // => [3]
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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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* // using the `_.matches` callback shorthand
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* _.pluck(_.dropWhile(users, { 'user': 'barney', 'active': false }), 'user');
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* // => ['fred', 'pebbles']
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*
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* // using the `_.matchesProperty` callback shorthand
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* _.pluck(_.dropWhile(users, 'active', false), 'user');
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* // => ['pebbles']
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*
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* // using the `_.property` callback shorthand
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* _.pluck(_.dropWhile(users, 'active'), 'user');
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* // => ['barney', 'fred', 'pebbles']
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*/
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function dropWhile(array, predicate, thisArg) {
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return (array && array.length)
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? baseWhile(array, baseCallback(predicate, thisArg, 3), true)
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: [];
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}
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module.exports = dropWhile;
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