Array.prototype.pop()

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.

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pop() Array , . .

const plants = ["broccoli", "cauliflower", "cabbage", "kale", "tomato"];

console.log(plants.pop());
// Expected output: "tomato"

console.log(plants);
// Expected output: Array ["broccoli", "cauliflower", "cabbage", "kale"]

plants.pop();

console.log(plants);
// Expected output: Array ["broccoli", "cauliflower", "cabbage"]

pop()

. undefined .

pop() . pop() undefined .

Array.prototype.shift() pop() .

pop() . this . this arr.slice(0, -1) .

pop() . this length . , .

4 myFish .

const myFish = ["angel", "clown", "mandarin", "sturgeon"];

const popped = myFish.pop();

console.log(myFish); // ['angel', 'clown', 'mandarin' ]

console.log(popped); // 'sturgeon'

pop()

pop() this length . 0 length 0 ( undefined ). length - 1 .

const arrayLike = {
  length: 3,
  unrelated: "foo",
  2: 4,
};
console.log(Array.prototype.pop.call(arrayLike));
// 4
console.log(arrayLike);
// { length: 2, unrelated: 'foo' }

const plainObj = {};
// length  , length 0
Array.prototype.pop.call(plainObj);
console.log(plainObj);
// { length: 0 }

push pop , .

. , Array.prototype.push Array.prototype.pop call .

const collection = {
  length: 0,
  addElements(...elements) {
    // obj.length   
    //  .

    // push  
    //     .
    return [].push.call(this, ...elements);
  },
  removeElement() {
    // obj.length   
    //  .

    // pop  
    //   .
    return [].pop.call(this);
  },
};

collection.addElements(10, 20, 30);
console.log(collection.length); // 3
collection.removeElement();
console.log(collection.length); // 2

Specification
ECMAScript 2027 LanguageSpecification # sec-array.prototype.pop

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Array.prototype.pop()

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pop()

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