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