What is the best way to calculate the difference and total of all arrays within an array?

Question

What is the best way to calculate the difference and total of all arrays within an array?

Within my array of arrays, I am trying to subtract all inner arrays a - b and then sum the results. For example: [[10,0],[3,5],[5,8]] would result in 10 - 0 = 10, 3 - 5 = -2, 5 - 8 = -3, giving a total of 10 + (-2) + (-3) = 5;

Here is my attempt:

 var el;
 return array.reduce((a, b) => a - b );

However, my result came out as NaN. Now I understand that trying to subtract an array from another array was not a good idea. I know how to achieve this using a 'for' loop or similar method, but my question is:

How can I accomplish this using reduce or other "modern" method?

Thank you for your help.

PS. Please excuse any errors in my English skills ;)

javascript arrays reduce

Answer 1

Answer №1

To implement the reduce() method, you can follow this example.

var elements = [[10,0],[3,5],[5,8]]
var total = elements.reduce((result, item) => result + (item[0] - item[1]), 0);
console.log(total)

Answer 2

To implement the reduce() method, you can follow this example.

var elements = [[10,0],[3,5],[5,8]]
var total = elements.reduce((result, item) => result + (item[0] - item[1]), 0);
console.log(total)

Answer 3

Answer №2

This solution is extremely adaptable as it can handle nested arrays of any size without compromising the accuracy of the result.

const calculateSum = (arr) => arr.reduce((sum, subArr) => {
        sum += subArr.reduce((a, b) => a - b);
        return sum;
      }, 0);

let arrayOne = [ [10, 0], [3, 5], [5, 8] ],
    arrayTwo = [ [5, 4, 1], [3, 5, 5], [5, 8] ];
    
console.log(calculateSum(arrayOne));
console.log(calculateSum(arrayTwo));

Answer 4

This solution is extremely adaptable as it can handle nested arrays of any size without compromising the accuracy of the result.

const calculateSum = (arr) => arr.reduce((sum, subArr) => {
        sum += subArr.reduce((a, b) => a - b);
        return sum;
      }, 0);

let arrayOne = [ [10, 0], [3, 5], [5, 8] ],
    arrayTwo = [ [5, 4, 1], [3, 5, 5], [5, 8] ];
    
console.log(calculateSum(arrayOne));
console.log(calculateSum(arrayTwo));

Answer 5

Answer №3

Is this what you were looking for? You were getting close, but don't forget to set the initial value as 0 and deconstruct the inner arrays into variables a and b like shown below:

var matrix = [[10,0],[3,5],[5,8]];

var total = matrix.reduce((previous, [a, b]) => previous + (a - b), 0);

console.log(total);

Answer 6

Is this what you were looking for? You were getting close, but don't forget to set the initial value as 0 and deconstruct the inner arrays into variables a and b like shown below:

var matrix = [[10,0],[3,5],[5,8]];

var total = matrix.reduce((previous, [a, b]) => previous + (a - b), 0);

console.log(total);

Answer 7

Answer №4

let numbers = [[2,6],[8,3],[1,7]];
numbers.map(pair => pair[0] * pair[1]).reduce((x,y) => x + y)

Answer 8

let numbers = [[2,6],[8,3],[1,7]];
numbers.map(pair => pair[0] * pair[1]).reduce((x,y) => x + y)

Answer 9

Answer №5

To optimize the code, consider decreasing both the outer and inner arrays.

var array = [[8, 4], [5, 3], [7, 1]],
    result = array.reduce(function (r, a) {
        return r + a.reduce(function (x, y) {
            return x - y;
        })
    }, 0);

console.log(result);

Answer 10

To optimize the code, consider decreasing both the outer and inner arrays.

var array = [[8, 4], [5, 3], [7, 1]],
    result = array.reduce(function (r, a) {
        return r + a.reduce(function (x, y) {
            return x - y;
        })
    }, 0);

console.log(result);

What is the best way to calculate the difference and total of all arrays within an array?

Answer №1

Answer №2

Answer №3

Answer №4

Answer №5

Similar questions

Suggestions for changing sub-component data in Vue

Getting a variable from outside of the observable in Angular - a step-by-step guide

Storing the background color in a JavaScript variable

Create a path on the Google Map that follows the designated route

Issue with the successful execution of connection event handler in NodeJS and Socket.io?

Any recommendations for updating input in a directive without relying on $broadcast?

Can you provide guidance on achieving a gradient effect throughout the mesh, similar to the one shown in the example?

How can data be transferred from child component inputs to a parent form in Angular's template-driven approach?

Retrieve the index of several callbacks created within a loop iteration

What is the process for removing an element from my Reducer Object?

When working with Angular 2 and Typescript, a common error message that may be encountered is "TypeError

A situation where the event onclick fails to occur within NextJS

Issues with syntax in AJAX programming can be a significant road

An AngularJS directive designed to execute after a text input has been modified

What is preventing me from using memoization in the getServerSideProps of NextJS?

Unable to supersede CSS module styling using global or external stylesheets in React, Next.js, or React Native

What is the method to update an element when any of the items in an array is marked as "Confirmed"?

Utilizing Javascript to implement a tooltip feature for dynamically inserted text

Obtain the chosen item from a Bootstrap4 dropdown menu by utilizing a button

Having trouble displaying an array in React.JS