Uint8ClampedArray() constructor

The Uint8ClampedArray() constructor creates a typed array of 8-bit unsigned integers clamped to 0-255; if you specified a value that is out of the range of [0,255], 0 or 255 will be set instead; if you specify a non-integer, the nearest integer will be set. The contents are initialized to 0. 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).

Syntax

new Uint8ClampedArray()
new Uint8ClampedArray(length)
new Uint8ClampedArray(typedArray)
new Uint8ClampedArray(object)

new Uint8ClampedArray(buffer)
new Uint8ClampedArray(buffer, byteOffset)
new Uint8ClampedArray(buffer, byteOffset, length)

Note: Uint8ClampedArray() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

Exceptions

Examples

Different ways to create a Uint8ClampedArray

// From a length
const uintc8 = new Uint8ClampedArray(2);
uintc8[0] = 42;
uintc8[1] = 1337;
console.log(uintc8[0]); // 42
console.log(uintc8[1]); // 255 (clamped)
console.log(uintc8.length); // 2
console.log(uintc8.BYTES_PER_ELEMENT); // 1

// From an array
const x = new Uint8ClampedArray([21, 31]);
console.log(x[1]); // 31

// From another TypedArray
const y = new Uint8ClampedArray(x);
console.log(y[0]); // 21

// From an ArrayBuffer
const buffer = new ArrayBuffer(8);
const z = new Uint8ClampedArray(buffer, 1, 4);
console.log(z.byteOffset); // 1

// From an iterable
const iterable = (function* () {
  yield* [1, 2, 3];
})();
const uintc8FromIterable = new Uint8ClampedArray(iterable);
console.log(uintc8FromIterable);
// Uint8ClampedArray [1, 2, 3]

Specifications

Specification
ECMAScript Language Specification
# sec-typedarray-constructors

Browser compatibility

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See also