javascript reduce method

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Kumar Abhishek answered on May 21, 2020 Popularity 8/10 Helpfulness 2/10

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javascript reduce method

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reduce(callbackFn)
reduce(callbackFn, initialValue)

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Source: developer.mozilla.org

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Contributed on May 29 2024

Kumar Abhishek

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javascript reduce

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187

var array = [36, 25, 6, 15];

array.reduce(function(accumulator, currentValue) {
  return accumulator + currentValue;
}, 0); // 36 + 25 + 6 + 15 = 82

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Contributed on May 21 2020

TC5550

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JavaScript Reduce

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const arr = [1, 2, 3]
const result = arr.reduce((acc, curr) => acc + curr, 0)
// 1 + 2 + 3 = 6
console.log(result)

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Contributed on Dec 21 2022

Jozvan

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reduce function in js

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let arr = [1, 2, 3, 4, 5];
let newArr = arr.reduce((item1,item2) => {
    return item1 + item2;
})

console.log(newArr)
// output 15
// 1+2+3+4+5

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Contributed on Feb 09 2023

Muhammad Rayyan

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javascript reduce

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const sum = array.reduce((accumulator, element) => {
  return accumulator + element;
}, 0);

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Contributed on Apr 11 2021

Cooperative Capybara

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JavaScript Array Methods .reduce()

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const list = [1, 2, 3, 4, 5];
console.log(list.reduce((number, nextNumber) => number + nextNumber));
// --> 15

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Source: github.com

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Contributed on May 07 2021

Hilarious Hippopotamus

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THE REDUCE() METHOD IN JAVASCRIPT

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/*
This method takes a callback that takes two parameters,
one that represents the element from the last iteration and the other is the current
element of the iteration
*/

let nums = [2,4,6,8,3,5]

let result = nums.reduce((prev,curr)=>prev+curr)
console.log(result); // 28

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Source: blog.devgenius.io

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Contributed on Jul 10 2022

OHIOLee

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javascript reduce

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[3, 2.1, 5, 8].reduce((total, number) => total + number, 0)

// loop 1: 0 + 3
// loop 2: 3 + 2.1
// loop 3: 5.1 + 5
// loop 4: 10.1 + 8
// returns 18.1

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Contributed on Aug 10 2021

Troubled Tiger

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javascript reduce

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You can return whatever you want from reduce method, reduce array method good for computational problems
const arr = [36, 25, 6, 15];
array.reduce(function(accumulator, currentValue) {
  return accumulator + currentValue;
}, 0); // this will return Number
array.reduce(function(accumulator, currentValue) {
  return accumulator + currentValue;
}, []); // this will return array
let {total} = array.reduce(function(accumulator, currentValue) {
  let {currentVal} = currentValue
  return accumulator + currentVal;
}, {
total: 0
}); // this will return object
And one additional rule is always always retrun the first param, which do arithmetic operations.

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Contributed on Jan 13 2022

Musawir MOSA

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javascript reduce function array

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let numbers = [1, 2, 3];
let sum = numbers.reduce(function (previousValue, currentValue) {
    return previousValue + currentValue;
});

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Source: www.javascripttutorial.net

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Contributed on Apr 28 2022

Michael Futral

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reduce method

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function reduce(array, combine, start) {
  let current = start;
  for (let element of array) {
    current = combine(current, element);
  }
  return current;
}

console.log(reduce([1, 2, 3, 4], (a, b) => a + b, 0));
// → 10

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Contributed on Oct 01 2021

Xanthous Xenomorph

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javascript reduce method

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