replace method

The replace method searches for and replaces parts of a string. The first parameter is the substring to be replaced with the substring in the second parameter.

Syntax

javascriptstring.replace(what to replace, by what to replace);

Example

Let's replace 'ab' in the string with '!':

javascriptlet str = 'abcde';
let newStr = str.replace('ab', '!');

console.log(newStr);

The code execution result:

javascript'!cde'

Example

Let's try to replace all matches in a string:

javascriptlet str = 'ab cde ab';
let newStr = str.replace('ab', '!');

console.log(newStr);

We see that the replacement occurred only on the first match:

javascript'! cde ab'

Example

Although the replace method only changes the first match, you can replace all matches in a loop:

javascriptlet elem = 'ab';
let str = 'ab cde ab';

while (str.includes(elem)) {
  str = str.replace(elem, '!');
}

console.log(str);

The code execution result:

javascript'! cde !'

See also