Uint8ClampedArray
Baseline Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.
TheUint8ClampedArray typed array represents an array of 8-bit unsigned integers clamped to 0–255. The contents are initialized to0 unless initialization data is explicitly provided. Once established, you can reference elements in the array using the object's methods, or using standard array index syntax (that is, using bracket notation).
Uint8ClampedArray is a subclass of the hiddenTypedArray class.
Constructor
Uint8ClampedArray()Creates a new
Uint8ClampedArrayobject.
Static properties
Also inherits static properties from its parentTypedArray.
Uint8ClampedArray.BYTES_PER_ELEMENTReturns a number value of the element size.
1in the case ofUint8ClampedArray.
Static methods
Inherits static methods from its parentTypedArray.
Instance properties
Also inherits instance properties from its parentTypedArray.
These properties are defined onUint8ClampedArray.prototype and shared by allUint8ClampedArray instances.
Uint8ClampedArray.prototype.BYTES_PER_ELEMENTReturns a number value of the element size.
1in the case of aUint8ClampedArray.Uint8ClampedArray.prototype.constructorThe constructor function that created the instance object. For
Uint8ClampedArrayinstances, the initial value is theUint8ClampedArrayconstructor.
Instance methods
Inherits instance methods from its parentTypedArray.
Examples
Different ways to create a Uint8ClampedArray
// From a lengthconst uint8c = new Uint8ClampedArray(2);uint8c[0] = 42;uint8c[1] = 1337;console.log(uint8c[0]); // 42console.log(uint8c[1]); // 255 (clamped)console.log(uint8c.length); // 2console.log(uint8c.BYTES_PER_ELEMENT); // 1// From an arrayconst x = new Uint8ClampedArray([21, 31]);console.log(x[1]); // 31// From another TypedArrayconst y = new Uint8ClampedArray(x);console.log(y[0]); // 21// From an ArrayBufferconst buffer = new ArrayBuffer(8);const z = new Uint8ClampedArray(buffer, 1, 4);console.log(z.byteOffset); // 1// From an iterableconst iterable = (function* () { yield* [1, 2, 3];})();const uint8cFromIterable = new Uint8ClampedArray(iterable);console.log(uint8cFromIterable);// Uint8ClampedArray [1, 2, 3]Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-typedarray-objects |