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reduce method

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Abdullah Naifeh answered on January 17, 2021 Popularity 9/10 Helpfulness 1/10

answer reduce method

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reduce()

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const array1 = [1, 2, 3, 4];
const reducer = (accumulator, currentValue) => accumulator + currentValue;

// 1 + 2 + 3 + 4
console.log(array1.reduce(reducer));
// expected output: 10

// 5 + 1 + 2 + 3 + 4
console.log(array1.reduce(reducer, 5));
// expected output: 15

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: developer.mozilla.org

Tags: javascript j

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Contributed on Jan 17 2021

putsan

0 Answers Avg Quality 2/10

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

Popularity 10/10 Helpfulness 4/10 Language javascript

Source: Grepper

Tags: function functio

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Contributed on Feb 09 2023

Muhammad Rayyan

0 Answers Avg Quality 2/10

reduce in js

Comment

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

Popularity 9/10 Helpfulness 3/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 19 2023

pabel reja

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

JavaScript Array Methods .reduce()

Comment

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

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Source: github.com

Tags: javascript j

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Contributed on May 07 2021

Hilarious Hippopotamus

0 Answers Avg Quality 2/10

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

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Source: www.codecademy.com

Tags: javascript j

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Contributed on Feb 20 2022

Healthy Hamerkop

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 in js

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n JavaScript, the reduce() method is used to apply a function to each element of an array and reduce it to a single value. The reduce() method takes two parameters: a callback function and an optional initial value.

Here is the basic syntax of the reduce() method:

'array.reduce(callback, initialValue)'

The callback function takes four parameters: accumulator, currentValue, currentIndex, and array. The accumulator is the value returned from the previous invocation of the callback, or the initialValue if provided. The currentValue is the current element being processed, currentIndex is the index of the current element, and array is the array on which reduce() was called.

The reduce() method executes the callback function once for each element in the array (excluding the initial value if provided), and the return value of the callback becomes the new value of the accumulator.

Here is an example that demonstrates the usage of reduce() to calculate the sum of an array of numbers:

const numbers = [1, 2, 3, 4, 5];

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

console.log(sum); // Output: 15


In the example above, the reduce() method is called on the numbers array. The callback function takes two parameters, accumulator and currentValue, and simply adds them together. The initial value of the accumulator is set to 0 using the second argument of reduce(). The final result, 15, is the sum of all the numbers in the array.

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on Jun 19 2023

Strange Shrew

0 Answers Avg Quality 2/10

array reduce method in javascript

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// 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 9/10 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 in js

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reduce in js with a previous accumulator value

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

var p=array.reduce(function(accumulator, currentValue,index,arr) {
  return accumulator+=currentValue;
},8); // 36 + 25 + 6 + 15 = 82
 console.log(p);

here accumulator previously accumulate value 8

Popularity 10/10 Helpfulness 2/10 Language javascript

Source: Grepper

Tags: javascript j

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Contributed on May 19 2023

pabel reja

0 Answers Avg Quality 2/10

reduce method

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reduce method

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reduce()

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reduce in js

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js .reducer method

THE REDUCE() METHOD IN JAVASCRIPT

reduce in js

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reduce in js

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