Solve - pop is not a function Error in JavaScript

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Borislav Hadzhiev

Wed Oct 20 20212 min read

Solve - pop is not a function Error #

The "pop is not a function" error occurs when the pop() method is called on a value that is not an array. To solve the error, convert the value to an array before calling the method or make sure to only call the pop() method on valid arrays.

typeerror pop is not a function

Here is an example of how the error occurs.

index.js
const obj = {name: 'Tom'}; // โ›”๏ธ TypeError: pop is not a function obj.pop();

We called the Array.pop method on an object, which caused the error.

In this situation, we should place the object in an array, so we are able to use the pop method.

index.js
const arr = [{name: 'Tom'}, {name: 'Jim'}]; arr.pop(); // ๐Ÿ‘‡๏ธ [{name: 'Tom'}] console.log(arr);

If you're getting the error when working with a NodeList or other array-like object, you can convert the array-like object to an array, before calling the pop() method.

index.js
const set = new Set(['a', 'b', 'c']); const arr = Array.from(set); console.log(arr); // ๐Ÿ‘‰๏ธ ['a', 'b', 'c'] arr.pop(); console.log(arr); // ๐Ÿ‘‰๏ธ ['a', 'b']

We converted a Set object to an array using the Array.from method, so we can call the pop() method on the array.

If the error persists, console.log the value you're calling the pop() method on and make sure it's an array.

Here is an example that checks if the value is an array before calling the pop method.

index.js
const arr = null; if (Array.isArray(arr)) { arr.pop(); }

We used the Array.isArray method to check if the value is an array before calling the pop method.

If you're working with an object, there's a good chance that you need to access a specific property that stores an array, so you can call the pop() method.

index.js
const obj = { numbers: [1, 2, 3], }; obj.numbers.pop(3); // ๐Ÿ‘‡๏ธ {numbers: [1, 2]} console.log(obj);

In the example, we accessed the numbers property, which stores an array and called the pop() method on it.

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