Float32Array
The Float32Array
typed array represents an array of 32-bit floating point numbers (corresponding to the C float
data type) in the platform byte order. If control over byte order is needed, use DataView
instead. 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).
Float32Array
is a subclass of the hidden TypedArray
class.
Constructor
Float32Array()
-
Creates a new
Float32Array
object.
Static properties
Also inherits static properties from its parent TypedArray
.
Float32Array.BYTES_PER_ELEMENT
-
Returns a number value of the element size.
4
in the case ofFloat32Array
.
Static methods
Inherits static methods from its parent TypedArray
.
Instance properties
Also inherits instance properties from its parent TypedArray
.
These properties are defined on Float32Array.prototype
and shared by all Float32Array
instances.
Float32Array.prototype.BYTES_PER_ELEMENT
-
Returns a number value of the element size.
4
in the case of aFloat32Array
. Float32Array.prototype.constructor
-
The constructor function that created the instance object. For
Float32Array
instances, the initial value is theFloat32Array
constructor.
Instance methods
Inherits instance methods from its parent TypedArray
.
Examples
Different ways to create a Float32Array
js
// From a length
const float32 = new Float32Array(2);
float32[0] = 42;
console.log(float32[0]); // 42
console.log(float32.length); // 2
console.log(float32.BYTES_PER_ELEMENT); // 4
// From an array
const x = new Float32Array([21, 31]);
console.log(x[1]); // 31
// From another TypedArray
const y = new Float32Array(x);
console.log(y[0]); // 21
// From an ArrayBuffer
const buffer = new ArrayBuffer(32);
const z = new Float32Array(buffer, 4, 4);
console.log(z.byteOffset); // 4
// From an iterable
const iterable = (function* () {
yield* [1, 2, 3];
})();
const float32FromIterable = new Float32Array(iterable);
console.log(float32FromIterable);
// Float32Array [1, 2, 3]
Specifications
Specification |
---|
ECMAScript Language Specification # table-49 |
Browser compatibility
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