How do I replace the first character of a string with another character? I am casting the number as string.
Example: String 12341 New string: 92341
I tried this script but cant figure a way to only replace the first character.
var oldStr =12341;
var newStr = oldStr.replace(1, 9);
oldStr is not a string, it's a number.
replace has to replace characters, not numbers.
So coerce the number to a string, and then do the replacement.
const oldStr = 12341;
const newStr = oldStr.toString().replace('1', '9');
console.log(newStr);