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TypedArray.prototype.length - JavaScript | MDN
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  5. TypedArray
  6. TypedArray.prototype.length
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TypedArray.prototype.length

Baseline Widely available

This feature is well established and works across many devices and browser versions. Its been available across browsers since 2015 7.

TypedArray length .

In this article

// Create an ArrayBuffer with a size in bytes
const buffer = new ArrayBuffer(8);
const uint8 = new Uint8Array(buffer, 2);

console.log(uint8.length);
// Expected output: 6

length undefined , . TypedArray . TypeArray byteOffset length ArrayBuffer . TypeArray TypeArray .

length

js
const buffer = new ArrayBuffer(8);

let uint8 = new Uint8Array(buffer);
uint8.length; // 8 (  )

uint8 = new Uint8Array(buffer, 1, 5);
uint8.length; // 5 (Uint8Array    )

uint8 = new Uint8Array(buffer, 2);
uint8.length; // 6 ( Uint8Array  )

Specification
ECMAScript 2027 LanguageSpecification
# sec-get-%typedarray%.prototype.length

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  2. TypedArray
    1. TypedArray.from()
    2. TypedArray.of()
    1. TypedArray.BYTES_PER_ELEMENT
    2. get TypedArray[@@species]
    1. TypedArray.prototype.at()
    2. TypedArray.prototype.copyWithin()
    3. TypedArray.prototype.entries()
    4. TypedArray.prototype.every()
    5. TypedArray.prototype.fill()
    6. TypedArray.prototype.filter()
    7. TypedArray.prototype.find()
    8. TypedArray.prototype.findIndex()
    9. TypedArray.prototype.findLast()
    10. TypedArray.prototype.findLastIndex()
    11. TypedArray.prototype.forEach()
    12. includes()
    13. TypedArray.prototype.indexOf()
    14. TypedArray.prototype.join()
    15. TypedArray.prototype.keys()
    16. lastIndexOf()
    17. TypedArray.prototype.map()
    18. TypedArray.prototype.reduce()
    19. 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. toLocaleString()
    27. TypedArray.prototype.toReversed()
    28. TypedArray.prototype.toSorted()
    29. TypedArray.prototype.toString()
    30. TypedArray.prototype.values()
    31. TypedArray.prototype.with()
    32. TypedArray.prototype[@@iterator]()
    1. TypedArray.prototype.buffer
    2. TypedArray.prototype.byteLength
    3. TypedArray.prototype.byteOffset
    4. TypedArray.prototype.length
  8. Object/Function
    1. Function.prototype.apply()
    2. Function.prototype.bind()
    3. Function.prototype.call()
    4. Function.prototype.toSource()
    5. Function.prototype[@@hasInstance]()
    1. Function: displayName
    2. Function.prototype.length
    3. Function: name
    4. Function
    5. Function.arguments
    6. Function.prototype.caller
    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.toString()
    10. Object.prototype.valueOf()
    1. Object.prototype.__proto__
    2. Object.prototype.constructor
  14. BigInt64Array
  15. BigUint64Array
  16. Float16Array
  17. Float32Array
  18. Float64Array
  19. Int8Array
  20. Int16Array
  21. Int32Array
  22. Uint8Array
  23. Uint8ClampedArray
  24. Uint16Array
  25. Uint32Array
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