JavaScript typedArray.indexOf() Method

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:

Example 1:

javascript

// 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
console.log(a);
console.log(b);
console.log(c);
console.log(d);

Output:

1
2
3
4

Example 2:

javascript

// 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
console.log(a);
console.log(b);
console.log(c);
console.log(d);

Output:

-1
-1
-1
-1