TypedArray.prototype.byteLength

The byteLength accessor property represents the length (in bytes) of a typed array.

Syntax

typedarray.byteLength

Description

The byteLength property is an accessor property whose set accessor function is undefined, meaning that you can only read this property. The value is established when a TypedArray is constructed and cannot be changed. If the TypedArray is not specifying an byteOffset or a length, the length of the referenced ArrayBuffer will be returned. TypedArray is one of the TypedArray objects.

Examples

Using the byteLength property

var buffer = new ArrayBuffer(8);

var uint8 = new Uint8Array(buffer);
uint8.byteLength; // 8 (matches the byteLength of the buffer)

var uint8 = new Uint8Array(buffer, 1, 5);
uint8.byteLength; // 5 (as specified when constructing the Uint8Array)

var uint8 = new Uint8Array(buffer, 2);
uint8.byteLength; // 6 (due to the offset of the constructed Uint8Array)

Specifications

Specification Status Comment
ECMAScript 2015 (6th Edition, ECMA-262)
The definition of 'TypedArray.prototype.byteLength' in that specification.		 Standard Initial definition.
ECMAScript Latest Draft (ECMA-262)
The definition of 'TypedArray.prototype.byteLength' in that specification.		 Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung InternetNode.js
byteLengthChrome Full support 7Edge Full support 14Firefox Full support 4IE Full support 10Opera Full support 11.6Safari Full support 5.1WebView Android Full support 4Chrome Android Full support 18Firefox Android Full support 4Opera Android Full support 12Safari iOS Full support 4.2Samsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support

See also

Related Topics
  1. Standard built-in objects
  2. TypedArray
  3. Properties
    1. TypedArray.BYTES_PER_ELEMENT
    2. TypedArray.name
    3. TypedArray.prototype
    4. TypedArray.prototype.buffer
    5. TypedArray.prototype.byteLength
    6. TypedArray.prototype.byteOffset
    7. TypedArray.prototype.length
    8. get TypedArray[@@species]
  4. Methods
    1. TypedArray.from()
    2. TypedArray.of()
    3. TypedArray.prototype.copyWithin()
    4. TypedArray.prototype.entries()
    5. TypedArray.prototype.every()
    6. TypedArray.prototype.fill()
    7. TypedArray.prototype.filter()
    8. TypedArray.prototype.find()
    9. TypedArray.prototype.findIndex()
    10. TypedArray.prototype.forEach()
    11. TypedArray.prototype.includes()
    12. TypedArray.prototype.indexOf()
    13. TypedArray.prototype.join()
    14. TypedArray.prototype.keys()
    15. TypedArray.prototype.lastIndexOf()
    16. TypedArray.prototype.map()
    17. TypedArray.prototype.move()
    18. TypedArray.prototype.reduce()
    19. TypedArray.prototype.reduceRight()
    20. TypedArray.prototype.reverse()
    21. TypedArray.prototype.set()
    22. TypedArray.prototype.slice()
    23. TypedArray.prototype.some()
    24. TypedArray.prototype.sort()
    25. TypedArray.prototype.subarray()
    26. TypedArray.prototype.toLocaleString()
    27. TypedArray.prototype.toString()
    28. TypedArray.prototype.values()
    29. TypedArray.prototype[@@iterator]()
  5. Related pages:
  6. Int8Array
  7. Uint8Array
  8. Uint8ClampedArray
  9. Int16Array
  10. Uint16Array
  11. Int32Array
  12. Uint32Array
  13. Float32Array
  14. Float64Array
  15. BigInt64Array
  16. BigUint64Array
  17. Inheritance:
  18. Function
  19. Properties
    1. Function.arguments
    2. Function.arity
    3. Function.caller
    4. Function.displayName
    5. Function.length
    6. Function.name
    7. Function.prototype
  20. Methods
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.isGenerator()
    5. Function.prototype.toSource()
    6. Function.prototype.toString()
  21. Object
  22. Properties
    1. Object.prototype.__count__
    2. Object.prototype.__noSuchMethod__
    3. Object.prototype.__parent__
    4. Object.prototype.__proto__
    5. Object.prototype.constructor
  23. Methods
    1. Object.prototype.__defineGetter__()
    2. Object.prototype.__defineSetter__()
    3. Object.prototype.__lookupGetter__()
    4. Object.prototype.__lookupSetter__()
    5. Object.prototype.hasOwnProperty()
    6. Object.prototype.isPrototypeOf()
    7. Object.prototype.propertyIsEnumerable()
    8. Object.prototype.toLocaleString()
    9. Object.prototype.toSource()
    10. Object.prototype.toString()
    11. Object.prototype.unwatch()
    12. Object.prototype.valueOf()
    13. Object.prototype.watch()
    14. Object.setPrototypeOf()