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42 lines
1.3 KiB
JavaScript
42 lines
1.3 KiB
JavaScript
var arrayPush = require('./arrayPush'),
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isArguments = require('../lang/isArguments'),
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isArray = require('../lang/isArray'),
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isArrayLike = require('./isArrayLike'),
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isObjectLike = require('./isObjectLike');
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/**
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* The base implementation of `_.flatten` with added support for restricting
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* flattening and specifying the start index.
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*
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* @private
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* @param {Array} array The array to flatten.
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* @param {boolean} [isDeep] Specify a deep flatten.
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* @param {boolean} [isStrict] Restrict flattening to arrays-like objects.
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* @param {Array} [result=[]] The initial result value.
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* @returns {Array} Returns the new flattened array.
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*/
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function baseFlatten(array, isDeep, isStrict, result) {
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result || (result = []);
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var index = -1,
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length = array.length;
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while (++index < length) {
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var value = array[index];
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if (isObjectLike(value) && isArrayLike(value) &&
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(isStrict || isArray(value) || isArguments(value))) {
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if (isDeep) {
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// Recursively flatten arrays (susceptible to call stack limits).
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baseFlatten(value, isDeep, isStrict, result);
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} else {
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arrayPush(result, value);
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}
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} else if (!isStrict) {
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result[result.length] = value;
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}
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}
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return result;
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}
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module.exports = baseFlatten;
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