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