JavaScript(JS) JS replace characters of a string

To replace characters of a string in JavaScript, you can use the replace() method with a regular expression or a string as the first argument. Here's an example:

let str = "hello world";
let charToReplace = "o";
let replacementChar = "0";

let newStr = str.replace(charToReplace, replacementChar);

console.log(newStr); // Output: "hell0 w0rld"

In this code, we define a string str that contains some characters. We also define a charToReplace variable that contains the character we want to replace, and a replacementChar variable that contains the character we want to replace it with.

We use the replace() method with the charToReplace and replacementChar variables as the first and second arguments, respectively. The replace() method will replace only the first instance of the charToReplace character by default. If you want to replace all instances of the character, you can use a regular expression with the g flag, as shown in the previous answer.

Finally, we print the modified string newStr to the console using console.log(). The output should be the original string with the first instance of the charToReplace character replaced with the replacementChar character.