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JavaScript String concat() Method

JavaScript concat() method is used to join two or more strings together. It does not change the existing string but returns a new string containing the text of the newly joined string.

Syntax:

string.concat(string1, string2, ..., stringX);

Parameter Values

Parameter	Description
string1, string2, ..., stringX	This is a required parameter. It defines the strings to be joined.

Browser Support

Method	Chrome	Edge	Firefox	Safari	Opera
concat()	Yes	Yes	Yes	Yes	Yes

Here is an example of concat() method:

<html>
<body>
<p>Click the button to join two strings.</p>
<button onclick="myFunction()">Click</button>
<p id="demo"></p>
<script>
function myFunction() {
  var str1 = "PHP ";
  var str2 = "Python";
  var res = str1.concat(str2);
  document.getElementById("demo").innerHTML = res;
}
</script>
</body>
</html>

Output:

Click the button to join two strings.

Example 2:

<html>
<body>
<p>Click the button to join two strings.</p>
<button onclick="myFunction()">Click</button>
<p id="demo"></p>
<script>
function myFunction() {
  var str1 = "PHP ";
  var str2 = "Python ";
  var str3 = "Java";
  var res = str1.concat(str2,str3);
  document.getElementById("demo").innerHTML = res;
}
</script>
</body>
</html>

Output:

Click the button to join two strings.

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