26 lines
646 B
JavaScript
26 lines
646 B
JavaScript
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var isArray = require('../type/is-array');
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/**
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* Flattens `array` a single level deep.
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*
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* @param {Array} arr The array to flatten.
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* @param {Array} result The array to return.
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* @return {Array} Returns the new flattened array.
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* @example
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*
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* flattenDeep([1, [2, [3, [4]], 5]]); // => [1, 2, 3, 4, 5]
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*/
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var flattenDeep = function flattenDeep(arr) {
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var result = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : [];
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if (!isArray(arr)) {
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result.push(arr);
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} else {
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for (var i = 0; i < arr.length; i += 1) {
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flattenDeep(arr[i], result);
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}
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}
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return result;
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};
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module.exports = flattenDeep;
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