Last Updated : 17 Jan, 2023
TypedArray demonstrates an array-like view of a binary data buffer. They are introduced in ECMAScript version 6 to handle binary data. There is no keyword reserved 'TypedArray', nor is there a directly visible TypedArray constructor.
There are several types of TypedArray shown below with their range, size, web IDL Type, and Equivalent C Type:
Type
Range Value
Size (Bytes)
Web IDL Type
Equivalent C type
Int8Array -128 to 127 1 byte int8_t Uint8Array 0 to 255 1 octet uint8_t Uint8ClampedArray 0 to 255 1 octet uint8_t Int16Array -32768 to 32767 2 short int16_t Uint16Array 0 to 65535 2 unsigned short uint16_t Int32Array -2147483648 to 2147483647 4 long int32_t Uint32Array 0 to 4294967295 4 unsigned long uint32_t Float32Array 1.2×10^-38 to 3.4×10^38 4 unrestricted float float Float64Array 5.0×10^-324 to 1.8×10^308 8 unrestricted double double BigInt64Array -2^63 to 2^63-1 8 bigint int64_t (signed long) BigUint64Array 0 to 2^64-1 8 bigint uint64_t (unsigned long)Constructor: This object cannot be instantiated directly. Instead, you have to create an instance of an array of a particular type, such as an UInt8Array or a BigInt64Array.
When creating an instance of a TypedArray(e.g. Int8Array), an Array Buffer instance is also created internally in the memory or, if an ArrayBuffer object is given as a constructor argument, then that argument is used instead.
We can create the instance of TypedArray by using the 'new' keyword with the respective constructor.
Syntax:
new TypedArray(); // Or new TypedArray(length); // Or new TypedArray(typedArray); // Or new TypedArray(object); // Or new TypedArray(buffer [, byteOffset [, length]]);
TypedArray can be of any type mentioned above.
Parameters: Below are the parameters that TypedArray can take:
Instantiating a TypedArray: Below are some examples that show how to instantiate a TypedArray.
Example 1: In this example, we will initialize a typedArray.
JavaScript
const buffer = new ArrayBuffer(8);
// Initiating using the constructor
const uint8 = new Uint8Array(buffer);
// Output is 8 as we initiated the length with 8
console.log(uint8.length);
Output:
8
Example 2: In this example, we will initialize a typedArray.
JavaScript
const int8 = new Int8Array([0, 0, 0, 0]);
int8.fill(4, 1, 3);
console.log(int8);
Output:
Int8Array(4) [0, 4, 4, 0, buffer: ArrayBuffer(4), byteLength: 4, byteOffset: 0, length: 4, Symbol(Symbol.toStringTag): 'Int8Array']
Example 3: Checking if the values are contained inside the TypedArray.
JavaScript
const int8 = new Int8Array([10, 20, 30, 40, 50]);
console.log(int8.includes(20));
console.log(int8.includes(20, 3));
Output:
true false
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