[Javascript] How can I replace a character at a given index of a string?

Question

I want to replace a character present at a given index of a string. How can I do that in Javascript?

Meera · Accepted Answer

Javascript doesn't have a inbuilt function to replace a character at a given index of a string. You can use `substring()` to achieve this functionality as shown below.

```js
let str = 'This is s test message';

let replacementStr = (index, replaceChar) => str.substring(0, index) + replaceChar + str.substring(index + replaceChar.length);
console.log(replacementStr(8, 'a ')); //Outputs 'This is a test message'
```

Run here [https://onecompiler.com/javascript/3xnrxxqd8](https://onecompiler.com/javascript/3xnrxxqd8)

[Javascript] How can I replace a character at a given index of a string?

1 Answer