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TypeScript | Array indexOf() Method

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The Array.indexOf() is an inbuilt TypeScript function which is used to find the index of the first occurrence of the search element provided as the argument to the function. 
 Syntax:

array.indexOf(searchElement[, fromIndex])

Parameter: This method accepts two parameter as mentioned above and described below: 

  • searchElement : This parameter is the Element to locate in the array.
  • fromIndex : This parameter is the index at which to begin the search.

Return Value: This method returns the index of the found element. 
Below examples illustrate the Array indexOf() method in TypeScript.

Example 1: 

JavaScript




<script>
    // Driver code
    var arr = [ 11, 89, 23, 7, 98 ]; 
  
    // use of indexOf() method 
    var val = arr.indexOf(7)
       
    // printing element
    console.log(val);
</script>


Output: 

3

Example 2: 

JavaScript




<script>
    // Driver code
    var arr = [ 'a','b','c','a','e' ]; 
  
    // use of indexOf() method 
    var val = arr.indexOf('a',4)
       
    // printing element
    console.log(val);
</script>


Output: 

-1

Last Updated : 18 Jun, 2020
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