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    Float32Array

    Summary

    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).

    Syntax

    Float32Array(length);
    Float32Array(typedArray);
    Float32Array(object);
    Float32Array(buffer [, byteOffset [, length]]);

    For more information about the constructor syntax and the parameters, see TypedArray.

    Properties

    Float32Array.BYTES_PER_ELEMENT
    Returns a number value of the element size. 4 in the case of an Float32Array.
    Float32Array.length
    Length property whose value is 3.
    Float32Array.name
    Returns the string value of the constructor name. In the case of the Float32Array type: "Float32Array".
    Float32Array.prototype
    Prototype for the TypedArray objects.

    Methods

    Float32Array.from()
    Creates a new Float32Array from an array-like or iterable object. See also Array.from().
    Float32Array.of()
    Creates a new Float32Array with a variable number of arguments. See also Array.of().

    Float32Array prototype

    All Float32Array objects inherit from %TypedArray%.prototype.

    Properties

    Float32Array.prototype.constructor
    Returns the function that created an instance's prototype. This is the Float32Array constructor by default.
    Float32Array.prototype.buffer Read only
    Returns the ArrayBuffer referenced by the Float32Array Fixed at construction time and thus read only.
    Float32Array.prototype.byteLength Read only
    Returns the length (in bytes) of the Float32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.
    Float32Array.prototype.byteOffset Read only
    Returns the offset (in bytes) of the Float32Array from the start of its ArrayBuffer. Fixed at construction time and thus read only.
    Float32Array.prototype.length Read only
    Returns the number of elements hold in the Float32Array. Fixed at construction time and thus read only.

    Methods

    Float32Array.prototype.copyWithin()
    Copies a sequence of array elements within the array. See also Array.prototype.copyWithin().
    Float32Array.prototype.entries()
    Returns a new Array Iterator object that contains the key/value pairs for each index in the array. See also Array.prototype.entries().
    Float32Array.prototype.every()
    Tests whether all elements in the array pass the test provided by a function. See also Array.prototype.every().
    Float32Array.prototype.fill()
    Fills all the elements of an array from a start index to an end index with a static value. See also Array.prototype.fill().
    Float32Array.prototype.filter()
    Creates a new array with all of the elements of this array for which the provided filtering function returns true. See also Array.prototype.filter().
    Float32Array.prototype.find()
    Returns the found value in the array, if an element in the array satisfies the provided testing function or undefined if not found. See also Array.prototype.find().
    Float32Array.prototype.findIndex()
    Returns the found index in the array, if an element in the array satisfies the provided testing function or -1 if not found. See also Array.prototype.findIndex().
    Float32Array.prototype.forEach()
    Calls a function for each element in the array. See also Array.prototype.forEach().
    Float32Array.prototype.includes()
    Determines whether a typed array includes a certain element, returning true or false as appropriate. See also Array.prototype.includes().
    Float32Array.prototype.indexOf()
    Returns the first (least) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.indexOf().
    Float32Array.prototype.join()
    Joins all elements of an array into a string. See also Array.prototype.join().
    Float32Array.prototype.keys()
    Returns a new Array Iterator that contains the keys for each index in the array. See also Array.prototype.keys().
    Float32Array.prototype.lastIndexOf()
    Returns the last (greatest) index of an element within the array equal to the specified value, or -1 if none is found. See also Array.prototype.lastIndexOf().
    Float32Array.prototype.map()
    Creates a new array with the results of calling a provided function on every element in this array. See also Array.prototype.map().
    Float32Array.prototype.move() Unimplemented
    Former non-standard version of Float32Array.prototype.copyWithin().
    Float32Array.prototype.reduce()
    Apply a function against an accumulator and each value of the array (from left-to-right) as to reduce it to a single value. See also Array.prototype.reduce().
    Float32Array.prototype.reduceRight()
    Apply a function against an accumulator and each value of the array (from right-to-left) as to reduce it to a single value. See also Array.prototype.reduceRight().
    Float32Array.prototype.reverse()
    Reverses the order of the elements of an array — the first becomes the last, and the last becomes the first. See also Array.prototype.reverse().
    Float32Array.prototype.set()
    Stores multiple values in the typed array, reading input values from a specified array.
    Float32Array.prototype.slice()
    Extracts a section of an array and returns a new array. See also Array.prototype.slice().
    Float32Array.prototype.some()
    Returns true if at least one element in this array satisfies the provided testing function. See also Array.prototype.some().
    Float32Array.prototype.sort()
    Sorts the elements of an array in place and returns the array. See also Array.prototype.sort().
    Float32Array.prototype.subarray()
    Returns a new Float32Array from the given start and end element index.
    Float32Array.prototype.values()
    Returns a new Array Iterator object that contains the values for each index in the array. See also Array.prototype.values().
    Float32Array.prototype.toLocaleString()
    Returns a localized string representing the array and its elements. See also Array.prototype.toLocaleString().
    Float32Array.prototype.toString()
    Returns a string representing the array and its elements. See also Array.prototype.toString().
    Float32Array.prototype[@@iterator]()
    Returns a new Array Iterator object that contains the values for each index in the array.

    Examples

    // From a length
    var 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
    var arr = new Float32Array([21,31]);
    console.log(arr[1]); // 31
    
    // From another TypedArray
    var x = new Float32Array([21, 31]);
    var y = new Float32Array(x);
    console.log(y[0]); // 21
    
    // From an ArrayBuffer
    var buffer = new ArrayBuffer(16);
    var z = new Float32Array(buffer, 0, 4);
    

    Specifications

    Specification Status Comment
    Typed Array Specification Obsolete Superseded by ECMAScript 6.
    ECMAScript 6 (ECMA-262)
    The definition of 'TypedArray constructors' in that specification.
    Release Candidate Initial definition in an ECMA standard.

    Browser compatibility

    Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
    Basic support 7.0 4.0 (2) 10 11.6 5.1
    Feature Android Chrome for Android Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
    Basic support 4.0 (Yes) 4.0 (2) 10 11.6 4.2

    See also

    Document Tags and Contributors

    Last updated by: fscholz,
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