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Healthy Hamerkop answered on September 9, 2020 Popularity 10/10 Helpfulness 3/10

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js .reducer method

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const arrayOfNumbers = [1, 2, 3, 4];
 
const sum = arrayOfNumbers.reduce((accumulator, currentValue) => {  
  return accumulator + currentValue;
});
 
console.log(sum); // 10

Popularity 10/10 Helpfulness 3/10 Language javascript

Source: www.codecademy.com

Tags: javascript reduce

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Contributed on Feb 20 2022

Healthy Hamerkop

0 Answers Avg Quality 2/10

Closely Related Answers

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;

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Mar 03 2022

Zidane (Vi Ly - VietNam)

0 Answers Avg Quality 2/10

Using Array.reduce() method

Comment

// 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

JavaScript Array Methods .reduce()

Comment

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 j

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Contributed on May 07 2021

Hilarious Hippopotamus

0 Answers Avg Quality 2/10

THE REDUCE() METHOD IN JAVASCRIPT

Comment

/*
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

reduce javascript

Comment

 let sum = arr.reduce((curr, index) => curr + index);

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Dec 24 2020

Frightened Frog

0 Answers Avg Quality 2/10

reduce method

Comment

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

Popularity 10/10 Helpfulness 2/10 Language css

Source: eloquentjavascript.net

Tags: css

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Contributed on Oct 01 2021

Xanthous Xenomorph

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

Popularity 8/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: array-reduce array-redu

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Contributed on Sep 03 2023

Amjad Saeed

0 Answers Avg Quality 2/10

reduce method

Comment

The reduce() method executes a reducer function (that you provide) on each element of the array, resulting in single output value.

The reducer function takes four arguments:
Accumulator (acc)
Current Value (cur)
Current Index (idx)
Source Array (src)

//syntax
arr.reduce(callback( accumulator, currentValue, [, index[, array]] )[, initialValue])
//example flatten an array

let flattened = [[0, 1], [2, 3], [4, 5]].reduce(
  ( accumulator, currentValue ) => accumulator.concat(currentValue),
  []
)

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Sep 09 2020

kepl3r

0 Answers Avg Quality 2/10

js .reducer method

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js .reducer method

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reduce javascript

reduce javascript

Using Array.reduce() method

JavaScript Array Methods .reduce()

THE REDUCE() METHOD IN JAVASCRIPT

reduce javascript

reduce method

array reduce method in javascript

reduce method

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