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String replace() Method with Example in JavaScript

JavaScript String replace() Method: Here, we are going to learn about the replace() method of string in JavaScript with Example.
Submitted by IncludeHelp, on February 05, 2019

String replace() Method

replace() Method is a string method, it is used to replace a given part of the string in another given string and returns new string.

Syntax

    new_string = str.replace(find, replace);

Parameters

str is the main string in which we have to perform the replacements.
find is the substring to be replaced in the string.
replace is the substring to be replaced.
new_string is the retuned string after the replacement find with replace.

Sample Input/Output

    Input:
    str = "Hello world!"
    find = "Hello"
    replace = "Hi"
    Output:
    "Hi world!"

Example

<html>
<head>
<title>JavaScipt Example</title>
</head>

<body>
<script>		
	var main_str = "Hello world!";
	var find = "Hello";
	var replace = "Hi";
	//calling the function
	var new_str = main_str.replace(find, replace);
	document.write("string before replacement: " + main_str + "<br>");
	document.write("string after replacement: " + new_str + "<br>");
</script>
</body>
</html>

Output

string before replacement: Hello world!
string after replacement: Hi world!