JavaScript Array indexOf() Method
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JavaScript Array indexOf() Method
The indexOf()
method returns the first index at which a given element can be found in the array, or -1 if it is not present.
Example
HTML Online Editor
<!DOCTYPE html>
<html>
<body>
<script>
var myFruit = ["Apple", "Banana", "Cherry", "Apple"];
document.write("Index of Apple is - " +myFruit.indexOf("Apple") +"<br>");
document.write("Index of Apple is - " +myFruit.indexOf("Apple", 2));
</script>
</body>
</html>
Syntax
Array.indexOf(value, start)
Parameter Values
Value | Type | Explanation |
---|---|---|
value | Required | Specifies the value to be searched in an array. |
start | Optional | Specifies the starting position. If start is omitted, the default value is 0. |
Return Values
Value | Explanation |
---|---|
Number | The first index at which a given element can be found in the array. |
-1 | If the specified element not found within an array. |
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