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JavaScript Array Methods .reduce()

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Hilarious Hippopotamus answered on May 21, 2020 Popularity 10/10 Helpfulness 3/10

answer JavaScript Array Methods .reduce()

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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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: github.com

Tags: javascript methods

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Contributed on May 07 2021

Hilarious Hippopotamus

0 Answers Avg Quality 2/10

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javascript reduce

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176

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

Source: Grepper

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

Source: Grepper

Tags: javascript j

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Contributed on Dec 21 2022

Jozvan

0 Answers Avg Quality 2/10

Using Array.reduce() method

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// define a reusable function
const calculateSum = (arr) => {
    return arr.reduce((total, current) => {
        return total + current;
    }, 0);
}

// try it
console.log(calculateSum([1, 2, 3, 4, 5]));

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: www.kindacode.com

Tags: javascript j

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Contributed on Aug 29 2022

Lucky Lizard

0 Answers Avg Quality 2/10

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

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: blog.devgenius.io

Tags: javascript j

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Contributed on Jul 10 2022

OHIOLee

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

Source: Grepper

Tags: javascript j

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Contributed on Apr 11 2021

Cooperative Capybara

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javascript reduce

Comment

[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

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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

Tags: function functio

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Contributed on Apr 28 2022

Michael Futral

0 Answers Avg Quality 2/10

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.

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jan 13 2022

Musawir MOSA

0 Answers Avg Quality 2/10

array reduce method in javascript

Comment

// Certainly! The reduce() method in JavaScript is a powerful tool for iterating over an array and accumulating a single value based on the elements of that array. It takes a callback function as its argument and can be used in various ways. Here are 10 tricky questions that will help you understand and master the reduce() method:

const items = ['apple', 'banana', 'apple', 'cherry', 'banana', 'apple'];
const itemCount = items.reduce((accumulator, currentValue) => {
  accumulator[currentValue] = (accumulator[currentValue] || 0) + 1;
  return accumulator;
}, {});
console.log(itemCount); // Output: { apple: 3, banana: 2, cherry: 1 }


const nestedArray = [[1, 2], [3, 4], [5, 6]];
const flattenedArray = nestedArray.reduce((accumulator, currentValue) => accumulator.concat(currentValue), []);
console.log(flattenedArray); // Output: [1, 2, 3, 4, 5, 6]


const numbers = [1, 2, 3, 4, 5];
const sum = numbers.reduce((accumulator, currentValue) => accumulator + currentValue, 0);
console.log(sum); // Output: 15

const people = [
  { name: 'Alice', age: 25 },
  { name: 'Bob', age: 30 },
  { name: 'Charlie', age: 35 }
];

const totalAge = people.reduce((accumulator, person) => accumulator + person.age, 0);
console.log(totalAge); // Output: 90


const words = ['apple', 'banana', 'cherry', 'date', 'elderberry'];
const longestWord = words.reduce((longest, word) => (word.length > longest.length ? word : longest), '');
console.log(longestWord); // Output: 'elderberry'


const originalArray = [1, 2, 3, 4, 5];
const reversedArray = originalArray.reduce((accumulator, currentValue) => [currentValue].concat(accumulator), []);
console.log(reversedArray); // Output: [5, 4, 3, 2, 1]


const numbers = [4, 2, 9, 5, 1];
const maxNumber = numbers.reduce((max, number) => (number > max ? number : max), numbers[0]);
console.log(maxNumber); // Output: 9


const people = [
  { name: 'Alice', nationality: 'USA' },
  { name: 'Bob', nationality: 'Canada' },
  { name: 'Charlie', nationality: 'USA' }
];

const groupedByNationality = people.reduce((accumulator, person) => {
  (accumulator[person.nationality] = accumulator[person.nationality] || []).push(person);
  return accumulator;
}, {});

console.log(groupedByNationality);
/* Output:
{
  USA: [
    { name: 'Alice', nationality: 'USA' },
    { name: 'Charlie', nationality: 'USA' }
  ],
  Canada: [
    { name: 'Bob', nationality: 'Canada' }
  ]
}
*/


const functions = [
  (x) => x * 2,
  (x) => x + 3,
  (x) => x - 1
];

const initialValue = 5;

const result = functions.reduce((acc, func) => func(acc), initialValue);
console.log(result); // Output: 11

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Source: Grepper

Tags: array-reduce array-redu

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Contributed on Sep 03 2023

Amjad Saeed

0 Answers Avg Quality 2/10

JavaScript Array Methods .reduce()

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JavaScript Array Methods .reduce()

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