Solve - some is not a function Error in JavaScript

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Borislav Hadzhiev

Last updated: Oct 20, 2021

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Solve - some is not a function Error #

The "some is not a function" error occurs when the some() 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 some() method on valid arrays.

typeerror some is not a function

Here is an example of how the error occurs.

index.js
const obj = {}; // ⛔️ TypeError: some is not a function const result = obj.some(element => element % 2 === 0);

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

To solve the error, we should make sure to only call the some method on valid arrays.

index.js
const arr = [13, 26, 39]; const result = arr.some(element => element % 2 === 0); console.log(result); // 👉️ true

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 some() method.

index.js
const set = new Set([3, 5, 8]); const arr = Array.from(set); console.log(arr); // 👉️ [3, 5, 8] const result = arr.some(element => element % 2 === 0); console.log(result); // 👉️ true

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

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

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

index.js
const arr = null; if (Array.isArray(arr)) { const result = arr.some(element => element % 2 === 0); }

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

index.js
const obj = { numbers: [3, 13, 26], }; const result = obj.numbers.some(element => element % 2 === 0); console.log(result); // 👉️ true

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

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