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rOACCT/node_modules/array-flatten/array-flatten.js
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array-flatten.js
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			'use strict'

			/**
			* Expose `arrayFlatten`.
			*/
			module.exports = flatten
			module.exports.from = flattenFrom
			module.exports.depth = flattenDepth
			module.exports.fromDepth = flattenFromDepth

			/**
			* Flatten an array.
			*
			* @param {Array} array
			* @return {Array}
			*/
			function flatten (array) {
			if (!Array.isArray(array)) {
			throw new TypeError('Expected value to be an array')
			}

			return flattenFrom(array)
			}

			/**
			* Flatten an array-like structure.
			*
			* @param {Array} array
			* @return {Array}
			*/
			function flattenFrom (array) {
			return flattenDown(array, [])
			}

			/**
			* Flatten an array-like structure with depth.
			*
			* @param {Array} array
			* @param {number} depth
			* @return {Array}
			*/
			function flattenDepth (array, depth) {
			if (!Array.isArray(array)) {
			throw new TypeError('Expected value to be an array')
			}

			return flattenFromDepth(array, depth)
			}

			/**
			* Flatten an array-like structure with depth.
			*
			* @param {Array} array
			* @param {number} depth
			* @return {Array}
			*/
			function flattenFromDepth (array, depth) {
			if (typeof depth !== 'number') {
			throw new TypeError('Expected the depth to be a number')
			}

			return flattenDownDepth(array, [], depth)
			}

			/**
			* Flatten an array indefinitely.
			*
			* @param {Array} array
			* @param {Array} result
			* @return {Array}
			*/
			function flattenDown (array, result) {
			for (var i = 0; i < array.length; i++) {
			var value = array[i]

			if (Array.isArray(value)) {
			flattenDown(value, result)
			} else {
			result.push(value)
			}
			}

			return result
			}

			/**
			* Flatten an array with depth.
			*
			* @param {Array} array
			* @param {Array} result
			* @param {number} depth
			* @return {Array}
			*/
			function flattenDownDepth (array, result, depth) {
			depth--

			for (var i = 0; i < array.length; i++) {
			var value = array[i]

			if (depth > -1 && Array.isArray(value)) {
			flattenDownDepth(value, result, depth)
			} else {
			result.push(value)
			}
			}

			return result
			}