_concat.js•698 B
/**
* Private `concat` function to merge two array-like objects.
*
* @private
* @param {Array|Arguments} [set1=[]] An array-like object.
* @param {Array|Arguments} [set2=[]] An array-like object.
* @return {Array} A new, merged array.
* @example
*
* _concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
*/
module.exports = function _concat(set1, set2) {
set1 = set1 || [];
set2 = set2 || [];
var idx;
var len1 = set1.length;
var len2 = set2.length;
var result = [];
idx = 0;
while (idx < len1) {
result[result.length] = set1[idx];
idx += 1;
}
idx = 0;
while (idx < len2) {
result[result.length] = set2[idx];
idx += 1;
}
return result;
};