40 lines
1.0 KiB
JavaScript
40 lines
1.0 KiB
JavaScript
/**
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* Iterates over elements of `array`, returning an array of all elements
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* `predicate` returns truthy for. The predicate is invoked with three
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* arguments: (value, index, array).
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*
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* **Note:** Unlike `remove`, this method returns a new array.
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*
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* @since 5.0.0
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* @category Array
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* @param {Array} array The array to iterate over.
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* @param {Function} predicate The function invoked per iteration.
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* @returns {Array} Returns the new filtered array.
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* @see pull, pullAll, pullAllBy, pullAllWith, pullAt, remove, reject
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* @example
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*
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* const users = [
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* { 'user': 'barney', 'active': true },
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* { 'user': 'fred', 'active': false }
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* ]
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*
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* filter(users, ({ active }) => active)
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* // => objects for ['barney']
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*/
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function filter(array, predicate) {
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let index = -1
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let resIndex = 0
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const length = array == null ? 0 : array.length
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const result = []
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while (++index < length) {
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const value = array[index]
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if (predicate(value, index, array)) {
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result[resIndex++] = value
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}
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}
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return result
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}
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export default filter
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