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JavaScript Array indexOf() Method

JavaScript Array indexOf() Method with example, javascript array methods, concat() method, every() method, filter() method, forEach() method, join() method, indexOf() method, lastIndexOf() method, map() method, push() method, slice() method, sort() method, unshift() method, toSource() method etc.

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JavaScript Array indexOf() method

The JavaScript array indexOf() method is used to search the position of a particular element in a given array. This method is case-sensitive.

The index position of first element in an array is always start with zero. If an element is not present in an array, it returns -1.

Syntax

The indexOf() method is represented by the following syntax:

array.indexOf(element,index)

Parameter

element - It represent the element to be searched.

<>index - It represent the index position from where search starts. It is optional.

Return

An index of a particular element.

JavaScript Array indexOf() method example

Let's see some simple examples of indexOf() method.

Example 1

Here, we will print the position of an element.

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.indexOf("C++");
document.writeln(result);
</script>
Test it Now

Output:

1

Example 2

In this example, we will provide the index value from where the search starts.

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.indexOf("C++",2);
document.writeln(result);
</script>
Test it Now

Output:

3

Example 3

Here, we will search an element which is not present in an array.

<script>
var arr=["C","C++","Python","C++","Java"];
var result= arr.indexOf("JavaScript");
document.writeln(result);
</script>
Test it Now

Output:

-1

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