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js reduce

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Encouraging Earthworm answered on May 21, 2020 Popularity 10/10 Helpfulness 3/10

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Sum array elements:
let myArr = [1,2,3,-1,-34,0]
return myArr.reduce((a,b) => a + b,0)

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Contributed on Dec 27 2020

Encouraging Earthworm

0 Answers Avg Quality 2/10

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javascript reduce

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175

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

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

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: javascript j

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Contributed on May 21 2020

TC5550

0 Answers Avg Quality 2/10

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)

Popularity 10/10 Helpfulness 4/10 Language javascript

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Tags: javascript j

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Contributed on Dec 21 2022

Jozvan

0 Answers Avg Quality 2/10

js reduce

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// syntax: array.reduce(function, accumulator-initial-value)
let array = [3, 7, 2, 9, 5]
const result = array.reduce((accumulator, currentValue, currentIndex, arr) => {
  // code
}, initialValue)

// accumulator = will store return value of the function
// currentValue = iterate through each array element
// currentIndex = index of currentValue
// arr = original array
// initialValue = set accumulator initial value

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Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jul 21 2021

Suman Majhi

0 Answers Avg Quality 2/10

reduce javascript

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let array = [36, 25, 6, 15];
 
array.reduce((acc, curr) => acc + curr, 0)
// 36 + 25 + 6 + 15 = 82

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jul 05 2022

Rick Oburu

0 Answers Avg Quality 2/10

reduce javascript

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var depthArray = [1, 2, [3, 4], 5, 6, [7, 8, 9]];

depthArray.reduce(function(flatOutput, depthItem) {
    return flatOutput.concat(depthItem);
}, []);

=> [1, 2, 3, 4, 5, 6, 7, 8, 9];


// --------------
const prices = [100, 200, 300, 400, 500];
const total = prices.reduce((total, cur) => {return total + cur} )
//  init value = 0 => total = 1500;


// --------------
const prices = [100, 200, 300, 400, 500];
const total = prices.reduce(function (total, cur) => {
                   return total + cur
                }, 1 )
// init value = 1 => so when plus all numnber will be result => 1501;

// --------------
const prices = [100, 200, 300, 400, 500];
const total = prices.reduce((total, cur) => total + cur )
// 1500;

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Contributed on Mar 03 2022

Zidane (Vi Ly - VietNam)

0 Answers Avg Quality 2/10

javascript reduce

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

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Tags: javascript j

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Contributed on Apr 11 2021

Cooperative Capybara

0 Answers Avg Quality 2/10

reduce in js

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Reduce in js

let arr=[5,6,2];
let sum=arr.reduce((accumulator,current,index,arr)=>{
   return accumulator+=current;
});
console.log(sum);//5+6+13

accumulator acumulate(hold) the sum output

reduce methood creat a new array and does not change actual array

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Contributed on May 19 2023

pabel reja

0 Answers Avg Quality 2/10

js array reduce

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// Arrow function
reduce((previousValue, currentValue) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex, array) => { /* ... */ } )
reduce((previousValue, currentValue, currentIndex, array) => { /* ... */ }, initialValue)

// Callback function
reduce(callbackFn)
reduce(callbackFn, initialValue)

// Inline callback function
reduce(function(previousValue, currentValue) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex, array) { /* ... */ })
reduce(function(previousValue, currentValue, currentIndex, array) { /* ... */ }, initialValue)

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Source: developer.mozilla.org

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Contributed on Feb 21 2022

Tung

0 Answers Avg Quality 2/10

array reduce

Comment

const values = [4, 3, 2, 1];
console.log("Before reduce");
const sum = values.reduce((accumulator, current) => {
  const result = accumulator + current;
  console.log(
    `accumulator: ${accumulator}, current: ${current}, result: ${result}`
  );
  //accumulator will be used to store the result and will be used in the next iteration
  return result;
});
console.log("After reduce");

// Before reduce
// accumulator: 4, current: 3, result: 7
// accumulator: 7, current: 2, result: 9
// accumulator: 9, current: 1, result: 10
// After reduce

console.log(sum); // => 10

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Source: koenwoortman.com

Tags: array-reduce array-redu

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Contributed on Jul 17 2023

Bongui

0 Answers Avg Quality 2/10

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