65 lines
1.2 KiB
JavaScript
65 lines
1.2 KiB
JavaScript
'use strict';
|
|
|
|
/**
|
|
* Expose `arrayFlatten`.
|
|
*/
|
|
module.exports = arrayFlatten;
|
|
|
|
/**
|
|
* Recursive flatten function with depth.
|
|
*
|
|
* @param {Array} array
|
|
* @param {Array} result
|
|
* @param {Number} depth
|
|
* @return {Array}
|
|
*/
|
|
function flattenWithDepth(array, result, depth) {
|
|
for (var i = 0; i < array.length; i++) {
|
|
var value = array[i];
|
|
|
|
if (depth > 0 && Array.isArray(value)) {
|
|
flattenWithDepth(value, result, depth - 1);
|
|
} else {
|
|
result.push(value);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Recursive flatten function. Omitting depth is slightly faster.
|
|
*
|
|
* @param {Array} array
|
|
* @param {Array} result
|
|
* @return {Array}
|
|
*/
|
|
function flattenForever(array, result) {
|
|
for (var i = 0; i < array.length; i++) {
|
|
var value = array[i];
|
|
|
|
if (Array.isArray(value)) {
|
|
flattenForever(value, result);
|
|
} else {
|
|
result.push(value);
|
|
}
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
/**
|
|
* Flatten an array, with the ability to define a depth.
|
|
*
|
|
* @param {Array} array
|
|
* @param {Number} depth
|
|
* @return {Array}
|
|
*/
|
|
function arrayFlatten(array, depth) {
|
|
if (depth == null) {
|
|
return flattenForever(array, []);
|
|
}
|
|
|
|
return flattenWithDepth(array, [], depth);
|
|
}
|