'use strict'
module.exports = flatten
module.exports.from = flattenFrom
module.exports.depth = flattenDepth
module.exports.fromDepth = flattenFromDepth
function flatten (array) {
if (!Array.isArray(array)) {
throw new TypeError('Expected value to be an array')
}
return flattenFrom(array)
}
function flattenFrom (array) {
return flattenDown(array, [])
}
function flattenDepth (array, depth) {
if (!Array.isArray(array)) {
throw new TypeError('Expected value to be an array')
}
return flattenFromDepth(array, depth)
}
function flattenFromDepth (array, depth) {
if (typeof depth !== 'number') {
throw new TypeError('Expected the depth to be a number')
}
return flattenDownDepth(array, [], depth)
}
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
}
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
}