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JavaScript Array reduceRight()

Voorbeelde

Trek die getalle in die skikking af, vanaf die einde:

const numbers = [175, 50, 25];

document.getElementById("demo").innerHTML = numbers.reduceRight(myFunc);

function myFunc(total, num) {
  return total - num;
}

Trek die getalle van regs na links af en vertoon die som:

const numbers = [2, 45, 30, 100];
document.getElementById("demo").innerHTML = numbers.reduceRight(getSum);

function getSum(total, num) {
  return total - num;
}

Definisie en gebruik

Die reduceRight()metode voer 'n verkleinerfunksie vir elke skikkingselement uit.

Die reduceRight()metode werk van regs na links.

Die reduceRight()metode gee 'n enkele waarde terug: die funksie se opgehoopte resultaat.

Die reduceRight()metode voer nie die funksie vir leë elemente uit nie.


Sintaksis

array.reduceRight(function(total, currentValue, currentIndex, arr), initialValue)

Grense

Parameter Description
function() Required.
A function to be run for each element in the array.
Reducer function parameters:
total Required.
The initialValue, or the previously returned value of the function.
currentValue Required.
The value of the current element.
currentIndex Optional.
The index of the current element.
arr Optional.
The array the element belongs to.
initialValue Optional.
A value to be passed to the function as the initial value

Terugkeerwaarde

Die opgehoopte resultaat van die laaste oproep van die terugbelfunksie.


Blaaierondersteuning

reduceRight()is 'n ECMAScript5 (ES5) kenmerk.

ES5 (JavaScript 2009) word ten volle ondersteun in alle blaaiers:

Chrome IE Edge Firefox Safari Opera
Yes 9-11 Yes Yes Yes Yes