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underscore
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cjs
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Editing: _flatten.js
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var _getLength = require('./_getLength.js'); var _isArrayLike = require('./_isArrayLike.js'); var isArray = require('./isArray.js'); var isArguments = require('./isArguments.js'); // Internal implementation of a recursive `flatten` function. 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; } module.exports = flatten;
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