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var isArray = require('../lang/isArray'); var append = require('./append'); /* * Helper function to flatten to a destination array. * Used to remove the need to create intermediate arrays while flattening. */ function flattenTo(arr, result, level) { if (level === 0) { append(result, arr); return result; } var value, i = -1, len = arr.length; while (++i < len) { value = arr[i]; if (isArray(value)) { flattenTo(value, result, level - 1); } else { result.push(value); } } return result; } /** * Recursively flattens an array. * A new array containing all the elements is returned. * If level is specified, it will only flatten up to that level. */ function flatten(arr, level) { if (arr == null) { return []; } level = level == null ? -1 : level; return flattenTo(arr, [], level); } module.exports = flatten;
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