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).
Constructor
Float32Array()- Creates a new
Float32Array object.
Static properties
Float32Array.BYTES_PER_ELEMENT- Returns a number value of the element size.
4 in the case of an Float32Array. Float32Array.name- Returns the string value of the constructor name. In the case of the
Float32Array type: "Float32Array".
Static 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().
Instance properties
Float32Array.prototype.buffer- Returns the
ArrayBuffer referenced by the Float32Array Fixed at construction time and thus read only. Float32Array.prototype.byteLength- Returns the length (in bytes) of the
Float32Array. Fixed at construction time and thus read only.
Float32Array.prototype.byteOffset- 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- Returns the number of elements hold in the
Float32Array. Fixed at construction time and thus read only.
Instance 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.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
Different ways to create a Float32Array
// 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);
// From an iterable
var iterable = function*(){ yield* [1,2,3]; }();
var float32 = new Float32Array(iterable);
// Float32Array[1, 2, 3]
Specifications
|
Desktop |
|
Chrome |
Edge |
Firefox |
Internet Explorer |
Opera |
Safari |
Float32Array |
7 |
12 |
4 |
10 |
11.6 |
5.1 |
Float32Array() constructor |
7 |
12 |
4 |
10 |
11.6 |
5.1 |
|
Mobile |
|
Android webview |
Chrome for Android |
Firefox for Android |
Opera for Android |
Safari on iOS |
Samsung Internet |
Float32Array |
4 |
18 |
4 |
12 |
4.2 |
1.0 |
Float32Array() constructor |
4 |
18 |
4 |
12 |
4.2 |
1.0 |
See also