reduce method

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Xanthous Xenomorph answered on January 17, 2021 Popularity 10/10 Helpfulness 2/10

answer reduce method

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reduce method

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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

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Contributed on Oct 01 2021

Xanthous Xenomorph

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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

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Contributed on Feb 09 2023

Muhammad Rayyan

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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

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Source: developer.mozilla.org

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Contributed on Jan 17 2021

putsan

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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

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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

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Contributed on Feb 20 2022

Healthy Hamerkop

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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]));

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Contributed on Aug 29 2022

Lucky Lizard

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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

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Contributed on May 07 2021

Hilarious Hippopotamus

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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

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Source: blog.devgenius.io

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Contributed on Jul 10 2022

OHIOLee

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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.

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Contributed on Jun 19 2023

Strange Shrew

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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

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Contributed on May 19 2023

pabel reja

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reduce method

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