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M M Kamalraj answered on May 21, 2020 Popularity 8/10 Helpfulness 2/10

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javascript reduce mdn

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//See how the accumulator works inside the reduce function
myRange = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11]
console.log(myRange.reduce((a, d) => {
   console.log(a);
   return a + d;
}, 10))

Popularity 8/10 Helpfulness 2/10 Language javascript

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Tags: javascript reduce

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Contributed on Jul 09 2022

M M Kamalraj

0 Answers Avg Quality 2/10

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javascript reduce

Comment

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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jul 21 2021

Suman Majhi

0 Answers Avg Quality 2/10

js reduce

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

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Contributed on Dec 27 2020

Encouraging Earthworm

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javascript reduce

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Apr 11 2021

Cooperative Capybara

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)

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: developer.mozilla.org

Tags: array-reduce array-redu

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Contributed on Feb 21 2022

Tung

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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

Popularity 10/10 Helpfulness 3/10 Language typescript

Source: dev.to

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Contributed on Aug 10 2021

Troubled Tiger

0 Answers Avg Quality 2/10

javascript reduce function array

Comment

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

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: www.javascripttutorial.net

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Contributed on Apr 28 2022

Michael Futral

0 Answers Avg Quality 2/10

javascript reduce

Comment

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.

Popularity 10/10 Helpfulness 2/10 Language javascript

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Tags: javascript j

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Contributed on Jan 13 2022

Musawir MOSA

0 Answers Avg Quality 2/10

JS Reduce example

Comment

const grades = [60, 55, 80, 90, 99, 92, 75, 72];
const total = grades.reduce(sum);
function sum(acc, grade) {  
return acc + grade;
}
const count = grades.length;
const letterGradeCount = grades.reduce(groupByGrade, {});
function groupByGrade(acc, grade) {  
const { a = 0, b = 0, c = 0, d = 0, f = 0 } = acc;  
if (grade >= 90) {    
return { ...acc, a: a + 1 };  
} else if (grade >= 80) {    
return { ...acc, b: b + 1 };  
} else if (grade >= 70) {    return { ...acc, c: c + 1 };  
} else if (grade >= 60) {    return { ...acc, d: d + 1 };  
} else {    return { ...acc, f: f + 1 };  }}
console.log(total, total / count, letterGradeCount);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: jsbin.com

Tags: javascript j

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Contributed on Aug 08 2022

ashiq ahmed

0 Answers Avg Quality 2/10

javascript reduce mdn

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