JavaScript typedArray.findIndex() with Example

The Javascript typedArray.findIndex() is an inbuilt function in JavaScript that 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 that is 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 example to show the working of this function:

Example: This example shows the basic use of the typedArray.findIndex() method in Javascript.

javascript

<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
    console.log(a);
    console.log(b);
    console.log(c);
    console.log(d);
</script>

Output:

0
2
0
-1