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38 lines
1.2 KiB
38 lines
1.2 KiB
var arrayPush = require('./_arrayPush'), |
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isFlattenable = require('./_isFlattenable'); |
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/** |
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* The base implementation of `_.flatten` with support for restricting flattening. |
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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 {number} depth The maximum recursion depth. |
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* @param {boolean} [predicate=isFlattenable] The function invoked per iteration. |
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* @param {boolean} [isStrict] Restrict to values that pass `predicate` checks. |
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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, depth, predicate, isStrict, result) { |
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var index = -1, |
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length = array.length; |
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predicate || (predicate = isFlattenable); |
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result || (result = []); |
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while (++index < length) { |
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var value = array[index]; |
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if (depth > 0 && predicate(value)) { |
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if (depth > 1) { |
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// Recursively flatten arrays (susceptible to call stack limits). |
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baseFlatten(value, depth - 1, predicate, 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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