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JavaScript Array indexOf() Method
JavaScript Array indexOf() Method
The JavaScript array indexOf() method in JavaScript is used to search the position of a particular element provided as the argument in a given array. This is case-sensitive method. The first element in the index position in an array is always start with zero and returns -1, if an element is not present in an array.
Syntax:array.indexOf(item, start)
Parameter Values
| Parameter | Description |
|---|---|
| item | It is Required. The item which is searched |
| start | It is optional. It represents the element at which position in the array to start the search. Negative values will start at the given position. |
Browser Support
| Method | Chrome | Edge | Firefox | Safari | Opera |
|---|---|---|---|---|---|
| indexOf() | Yes | 9.0 | 1.5 | Yes | Yes |
<html>
<body>
<button onclick="myIndexof()">Click me</button>
<p id="indexof1"></p>
<script>
function myIndexof()
{
var Colors = ["Red", "Blue", "Pink", "Green"];
var C = Colors.indexOf("Green");
document.getElementById("indexof1").innerHTML = C;
}
</script>
</body>
</html>
Output:
Example 2:
<html>
<body>
<script>
function inOf()
{
var array = [4, 65, 12, 55];
ocument.write(array.indexOf(65, 4));
}
inOf();
</script>
</body>
</html>
Output:
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