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Matriz JavaScript reduceRight()

Exemplos

Subtraia os números na matriz, começando do final:

const numbers = [175, 50, 25];

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

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

Subtraia os números, da direita para a esquerda, e exiba a soma:

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

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

Definição e uso

O reduceRight()método executa uma função redutora para cada elemento do array.

O reduceRight()método funciona da direita para a esquerda.

O reduceRight()método retorna um único valor: o resultado acumulado da função.

O reduceRight()método não executa a função para elementos vazios.

Veja também:

O método array reduce()


Sintaxe

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

Parâmetros

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

Valor de retorno

O resultado acumulado da última chamada da função de retorno de chamada.


Suporte ao navegador

reduceRight()é um recurso ECMAScript5 (ES5).

ES5 (JavaScript 2009) totalmente suportado em todos os navegadores:

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