JavaScript typedArray.from() Property
Last Updated :
15 Feb, 2023
The typedArray.from() is an inbuilt function in JavaScript which is used to construct a new typedArray from a normal array or any iterable object.
List of different typedArrays are specified in the table below:
Syntax:
typedArray.from(source, mapFn, thisArg)
Parameters: It accepts three parameters which are specified below-
- source: It is a normal array or any iterable object for converting to a typedArray.
- mapFn: It is optional and it is map function to call on every element of the typedArray.
- thisArg: It is optional and it is the value to be used while executing mapFn function.
Return value: It returns a new typedArray instance.
Example 1:
javascript
var a = new Set([ 5, 10, 15, 20, 25 ]);
var b = new Set([ 1, 2, 3, 4, 5 ]);
var c = new Set([ 1, 3, 5, 7, 9 ]);
var d = new Set([ 2, 4, 6, 8, 10 ]);
A = Uint8Array.from(a);
B = Uint8Array.from(b);
C = Uint8Array.from(c);
D = Uint8Array.from(d);
console.log(A);
console.log(B);
console.log(C);
console.log(D);
|
Output:
5, 10, 15, 20, 25
1, 2, 3, 4, 5
1, 3, 5, 7, 9
2, 4, 6, 8, 10
Example 2:
javascript
A = Uint16Array.from( '123456' );
B = Uint16Array.from( '80397418327' );
console.log(A);
console.log(B);
|
Output:
1, 2, 3, 4, 5, 6
8, 0, 3, 9, 7, 4, 1, 8, 3, 2, 7
Example 3:
javascript
var a = new Set([ 5, 10, 15, 20, 25 ]);
var b = new Set([ 1, 2, 3, 4, 5 ]);
var c = new Set([ 1, 3, 5, 7, 9 ]);
var d = new Set([ 2, 4, 6, 8, 10 ]);
A = Uint8Array.from(a, x => x + 1);
B = Uint8Array.from(b, x => x + 2);
C = Uint8Array.from(c, x => x * 2);
D = Uint8Array.from(d);
console.log(A);
console.log(B);
console.log(C);
console.log(D);
|
Output:
6, 11, 16, 21, 26
3, 4, 5, 6, 7
2, 6, 10, 14, 18
2, 4, 6, 8, 10
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