js获取数组最后一位元素的五种方法及执行效率对比

const arrayTest = [11, 22, 33];//示例数组

let lastValue0 = arrayTest[arrayTest.length - 1];
console.log(lastValue0);

let lastValue1 = arrayTest.slice(-1);
console.log(lastValue1[0]);

let lastValue2 = arrayTest.pop();
console.log(lastValue2);

let lastValue3 = arrayTest.at(-1);
console.log(lastValue3);

let lastValue4 = arrayTest.reverse()[0];
console.log(lastValue4);

const arrayTest = [11, 22, 33];
console.time("===> length");
let lastValue0 = arrayTest[arrayTest.length - 1];
console.log(lastValue0);
console.timeEnd("===> length");
// ===> length: 0.120849609375 ms
console.log(arrayTest);
console.time("===> slice");
let lastValue1 = arrayTest.slice(-1);
console.log(lastValue1[0]);
console.timeEnd("===> slice");
// ===> slice: 0.053955078125 ms
console.log(arrayTest);
console.time("===> pop");
let lastValue2 = arrayTest.pop();
console.log(lastValue2);
console.timeEnd("===> pop");
// ===> pop: 0.048095703125 ms
console.log(arrayTest);
arrayTest.push(33);
console.time("===> atat");
let lastValue3 = arrayTest.at(-1);
console.log(lastValue3);
console.timeEnd("===> atat");
// ===> atat: 0.0439453125 ms
console.log(arrayTest);
console.time("===> reverse");
let lastValue4 = arrayTest.reverse()[0];
console.log(lastValue4);
console.timeEnd("===> reverse");
// ===> reverse: 0.072998046875 ms
console.log(arrayTest);