TypedArray.prototype.reduce()

Baseline

20169

reduce() TypedArray Array.prototype.reduce()

const uint8 = new Uint8Array([0, 1, 2, 3]);

function sum(accumulator, currentValue) {
  return accumulator + currentValue;
}

console.log(uint8.reduce(sum));
// : 6

reduce(callbackFn)
reduce(callbackFn, initialValue)

callbackFn

callbackFn accumulator reduce()

accumulator: callbackFn initialValue array[0]
currentValue: initialValue array[0] array[1]
currentIndex: currentValue initialValue 0 1
array: reduce()

initialValue

accumulator initialValue callbackFn currentValue initialValue accumulator callbackFn 2 currentValue accumulator

TypeError: initialValue

Array.prototype.reduce()

const total = new Uint8Array([0, 1, 2, 3]).reduce((a, b) => a + b);
// total === 6


ECMAScript 2027 LanguageSpecification # sec-%typedarray%.prototype.reduce

TypedArray.prototype.reduce (core-js)
JavaScript
TypedArray
TypedArray.prototype.map()
TypedArray.prototype.reduceRight()
Array.prototype.reduce()
Object.groupBy()
Map.groupBy()

MDN

MDN 2026122

GitHub

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