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.


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<!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>


Array.indexOf(value, start)

Parameter Values

valueRequiredSpecifies the value to be searched in an array.
startOptionalSpecifies the starting position.
If start is omitted, the default value is 0.

Return Values

NumberThe first index at which a given element can be found in the array.
-1If the specified element not found within an array.


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