JavaScript String replaceAll() Method

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The Javascript replaceAll() method returns a new string after replacing all the matches of a string with a specified string or a regular expression. The original string is left unchanged after this operation.

Syntax:

const newString = originalString.replaceAll(regexp | substr , newSubstr | function)

Parameters: This method accepts certain parameters defined below:

regexp: It is the regular expression whose matches are replaced with the newSubstr or the value returned by the specified function.
substr: It defines the substrings which are to replace with newSubstr or the value returned by the specified function.
newSubstr: It is the substring that replaces all the matches of the string specified by the substr or the regular expression.
function: It is the function that is invoked to replace the matches with the regexp or substr.

Example: Below is an example of the String replaceAll() Method.

Javascript

function gfg() {
    let string = "Geeks or Geeks";
    newString = string.replaceAll("or", "for");
    console.log(newString);
}
gfg();

Output:

Geeks for Geeks

More examples of the replaceAll() method are given below:

Example 1: In this example, we will replace all occurrences of the Hello word with Hi using the replaceAll() method in Javascript.

Javascript

function GFG() {
    let string = "Hello, what are you doing?";
    newString = string.replaceAll("Hello", "Hi");
    console.log(newString);
}
GFG();

Output :

Hi, what are you doing?

Example 2: In this example, we will replace all occurrences of the coffee world with tea using the replaceAll() method in Javascript.

Javascript

function GFG() {
    const regexp = /coffee/ig;
    let string = "Lets, have coffee today!";
    newString = string.replaceAll(regexp, "tea");
    console.log(newString);
}
GFG();