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JavaScript | typedArray.findIndex() with Example
  • Last Updated : 19 Jul, 2018

The typedArray.findIndex() is an inbuilt function in JavaScript which is used to return an index in the tyedArray if the value satisfies the condition given in the function, otherwise, it returns -1.
Syntax:

typedarray.findIndex(callback)

Parameters: It takes the parameter “callback” function which checks each element of the typedArray satisfied by the condition provided. The Callback function takes three parameters that are specified below-

  • element: It is the value of the element.
  • index: It is the index of the element.
  • array: It is the array which are being traversed.
  • Return value: It returns an index in the array if the elements satisfied the condition provided by the function, otherwise, it returns -1.
    JavaScript code to show the working of this function:

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    <script>
      
       // Calling isNegative function to check
       // elements of the typedArray
       function isNegative(element, index, array)
       {
        return element < 0;
       }
      
       // Created some typedArrays.
       const A = new Int8Array([ -10, 20, -30, 40, -50 ]);
       const B = new Int8Array([ 10, 20, -30, 40, -50 ]);
       const C = new Int8Array([ -10, 20, -30, 40, 50 ]);
       const D = new Int8Array([ 10, 20, 30, 40, 50 ]);
      
       // Calling findIndex() function to check condition
       // provided by its parameter
       const a = A.findIndex(isNegative);
       const b = B.findIndex(isNegative);
       const c = C.findIndex(isNegative);
       const d = D.findIndex(isNegative);
      
       // Printing the indexes typedArray
       document.write(a +"<br>");
       document.write(b +"<br>");
       document.write(c +"<br>");
       document.write(d);
      
    </script>

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    Output:

    0
    2
    0
    -1

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