_slice.js•979 B
/**
* An optimized, private array `slice` implementation.
*
* @private
* @param {Arguments|Array} args The array or arguments object to consider.
* @param {Number} [from=0] The array index to slice from, inclusive.
* @param {Number} [to=args.length] The array index to slice to, exclusive.
* @return {Array} A new, sliced array.
* @example
*
* _slice([1, 2, 3, 4, 5], 1, 3); //=> [2, 3]
*
* var firstThreeArgs = function(a, b, c, d) {
* return _slice(arguments, 0, 3);
* };
* firstThreeArgs(1, 2, 3, 4); //=> [1, 2, 3]
*/
module.exports = function _slice(args, from, to) {
switch (arguments.length) {
case 1: return _slice(args, 0, args.length);
case 2: return _slice(args, from, args.length);
default:
var list = [];
var idx = 0;
var len = Math.max(0, Math.min(args.length, to) - from);
while (idx < len) {
list[idx] = args[from + idx];
idx += 1;
}
return list;
}
};