JavaScript | typedArray.indexOf() with Examples

Last Updated : 24 Jul, 2018

The typedArray.indexOf() is an inbuilt function in JavaScript which is used to return the index of the element if found in the given typedArray otherwise it returns -1.
Syntax:

typedarray.indexOf(Element, Index);

Parameters: It accepts two parameter which are specified below-

Element: It is the element which are being searched for index in the typedArray.

Index: It is the index of the element in the typedArray form where searching should be started. Its default value is zero (0) and it is optional.

Return value: It returns the index of the element if found in the given typedArray otherwise it returns -1.

JavaScript code to show the working of this function:
Code #1:

<script> 
  
    // Creating some typedArrays 
    const A = new Uint8Array([ 1, 2, 3, 4, 5 ]); 
    const B = new Uint8Array([ 5, 10, 15, 20 ]); 
    const C = new Uint8Array([ 0, 2, 4, 6,, 8, 10 ]); 
    const D = new Uint8Array([ 1, 3, 5, 7, 9 ]); 
  
    // Calling indexOf() function 
    a = A.indexOf(2) 
    b = B.indexOf(15, 1) 
    c = C.indexOf(6) 
    d = D.indexOf(9, 1) 
  
    // Printing the index of the elements given 
    // as the parameter of the indexOf() function 
    document.write(a + "<br>"); 
    document.write(b + "<br>"); 
    document.write(c + "<br>"); 
    document.write(d); 
  
</script> 

Output:

Code #2:

<script> 
  
    // Creating some typedArrays 
    const A = new Uint8Array([ 1, 2, 3, 4, 5 ]); 
    const B = new Uint8Array([ 5, 10, 15, 20 ]); 
    const C = new Uint8Array([ 0, 2, 4, 6,, 8, 10 ]); 
    const D = new Uint8Array([ 1, 3, 5, 7, 9 ]); 
  
   // Calling include() function 
   a = A.indexOf(6) 
   b = B.indexOf(21, 1) 
   c = C.indexOf(6, 4) 
   d = D.indexOf(0) 
  
   // Printing the index of the elements given 
   // as the parameter of the indexOf() function 
   document.write(a + "<br>"); 
   document.write(b + "<br>"); 
   document.write(c + "<br>"); 
   document.write(d); 
  
</script> 

Output:

-1
-1
-1
-1

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