JavaScript(JS) JS replace all instances of a character in a string

To replace all instances of a character in a string in JavaScript, you can use the replace() method with a regular expression. Here's an example:

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

let newStr = str.replace(new RegExp(charToReplace, "g"), 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 a regular expression new RegExp(charToReplace, "g") to replace all instances of the charToReplace character with the replacementChar character. The g flag in the regular expression tells replace() to perform the replacement globally (i.e., on all matches).

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