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JavaScript String includes() Method
What is JavaScript String includes() Method
JavaScript includes() method is used to find whether a string contains the characters of a defined string or not. It is case sensitive. It returns true value if the string contains the characters and false value if not.
Syntax:
string.includes(searchvalue, start)
Parameter Values
| Parameter | Description |
|---|---|
| searchvalue | This is a required parameter. It defines the string to search for. |
| start | This is an optional parameter. It defines at which position to start the search. |
Browser Support
| Method | Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|---|
| includes() | 41 | 12.0 | 40 | 9 | 28 |
Here is an example of includes() method:
<html>
<body>
<p>Click the button to see the Output</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "I am the king of this World.";
var n = str.includes("king");
document.getElementById("demo").innerHTML = n;
}
</script>
</body>
</html>
Output:
Click the button to see the Output
Example 2:
<html>
<body>
<p>Click the button to see the Output</p>
<button onclick="myFunction()">Try it</button>
<p id="demo"></p>
<script>
function myFunction() {
var str = "I am the king of this World.";
var n = str.includes("king", 9);
document.getElementById("demo").innerHTML = n;
}
</script>
</body>
</html>
Output:
Click the button to see the Output
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