[Vlasenko Fedor]

тесты

var arrA = [...Array(1000000).keys()];
var arrB = [...Array(1000000).keys()];
var arrC = [...Array(1000000).keys()];

var resA = [];
var resB = [];
var resC = [];

function testSplice(){
	return arrA.splice(0, 1);
}
function testSpliceEnd(){
	return arrB.splice(arrB.length - 1);
}
function testSpliceX(){
	var arr = arrC.slice(arrC.length - 1);
    arrC.length -= 1;
    return arr;
}
console.time('splice');
for (var i=0; i < 50000; i++){
	resA.push(testSplice());
}
console.timeEnd('splice');

console.time('spliceEnd');
for (var i=0; i < 50000; i++){
	resB.push(testSpliceEnd());
}
console.timeEnd('spliceEnd');

console.time('spliceX');
for (var i=0; i < 50000; i++){
	resC.push(testSpliceX());
}
console.timeEnd('spliceX');

console.log(arrA.length, arrB.length, arrC.length);