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32 lines
986 B
32 lines
986 B
3 years ago
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import getLength from './_getLength.js';
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import isArrayLike from './_isArrayLike.js';
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import isArray from './isArray.js';
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import isArguments from './isArguments.js';
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// Internal implementation of a recursive `flatten` function.
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export default function flatten(input, depth, strict, output) {
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output = output || [];
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if (!depth && depth !== 0) {
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depth = Infinity;
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} else if (depth <= 0) {
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return output.concat(input);
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}
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var idx = output.length;
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for (var i = 0, length = getLength(input); i < length; i++) {
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var value = input[i];
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if (isArrayLike(value) && (isArray(value) || isArguments(value))) {
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// Flatten current level of array or arguments object.
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if (depth > 1) {
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flatten(value, depth - 1, strict, output);
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idx = output.length;
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} else {
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var j = 0, len = value.length;
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while (j < len) output[idx++] = value[j++];
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}
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} else if (!strict) {
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output[idx++] = value;
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}
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}
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return output;
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}
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