mirror of
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89 lines
3.3 KiB
JavaScript
89 lines
3.3 KiB
JavaScript
/**
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* lodash 3.1.1 (Custom Build) <https://lodash.com/>
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* Build: `lodash modern modularize exports="npm" -o ./`
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* Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
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* Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
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* Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
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* Available under MIT license <https://lodash.com/license>
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*/
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var baseCallback = require('lodash._basecallback'),
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baseSlice = require('lodash._baseslice');
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/**
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* The base implementation of `_.dropRightWhile`, `_.dropWhile`, `_.takeRightWhile`,
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* and `_.takeWhile` without support for callback shorthands and `this` binding.
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*
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* @private
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* @param {Array} array The array to query.
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* @param {Function} predicate The function invoked per iteration.
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* @param {boolean} [isDrop] Specify dropping elements instead of taking them.
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* @param {boolean} [fromRight] Specify iterating from right to left.
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* @returns {Array} Returns the slice of `array`.
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*/
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function baseWhile(array, predicate, isDrop, fromRight) {
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var length = array.length,
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index = fromRight ? length : -1;
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while ((fromRight ? index-- : ++index < length) && predicate(array[index], index, array)) {}
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return isDrop
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? baseSlice(array, (fromRight ? 0 : index), (fromRight ? index + 1 : length))
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: baseSlice(array, (fromRight ? index + 1 : 0), (fromRight ? length : index));
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}
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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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