Question

I need to replace all the string in a variable.

var a = "::::::";
a = a.replace(":", "hi");
console.log(a);

The above code replaces only the first string i.e..hi::::::
I used replaceAll but it’s not working.

Answer 1

Update: All recent versions of major browsers, as well as NodeJS 15+ now support replaceAll

Original:

There is no replaceAll in JavaScript: the error console was probably reporting an error.

Instead, use the /g ("match globally") modifier with a regular expression argument to replace:

const a = "::::::";
const replaced = a.replace(/:/g,"hi");
console.log(replaced);

The is covered in MDN: String.replace (and elsewhere).