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JS Reduce example

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ashiq ahmed answered on May 21, 2020 Popularity 10/10 Helpfulness 2/10

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JS Reduce example

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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

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Tags: javascript reduce

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Contributed on Aug 08 2022

ashiq ahmed

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javascript reduce

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186

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

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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

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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

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Source: developer.mozilla.org

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Contributed on Jul 21 2021

Suman Majhi

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reduce javascript

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let array = [36, 25, 6, 15];
 
array.reduce((acc, curr) => acc + curr, 0)
// 36 + 25 + 6 + 15 = 82

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Contributed on Jul 05 2022

Rick Oburu

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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;

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Contributed on Mar 03 2022

Zidane (Vi Ly - VietNam)

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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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javascript reduce

Comment

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

Popularity 10/10 Helpfulness 3/10 Language javascript

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Contributed on Apr 11 2021

Cooperative Capybara

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js reduce

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

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Contributed on Dec 27 2020

Encouraging Earthworm

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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

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Contributed on Aug 10 2021

Troubled Tiger

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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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JS Reduce example

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