DEV Community: Valentin Antonio

Create a 2x2, 3x3 or NxN matrix with JS

Valentin Antonio — Fri, 14 Feb 2020 18:11:05 +0000

The matrix 2x2 is simple, :
I think the matrix of 2x2 and 3x3 is easy.

Example: Matrix [2x2];

var det=(matriz[0][0]*matriz[1][1])-(matriz[1][0]*matriz[0][1]);

Example: Matrix [3x3];

var r1=(matriz[0][0]*matriz[1][1]*matriz[2][2])+(matriz[0][1]*matriz[1][2]*matriz[2][0])+(matriz[0][2]*matriz[1][0]*matriz[2][1]);
var r2=(matriz[0][2]*matriz[1][1]*matriz[2][0])+(matriz[0][0]*matriz[1][2]*matriz[2][1])+(matriz[0][1]*matriz[1][0]*matriz[2][2]);
var result = r1-r2;

First create a function for get size the matrix.

 function Matriz(size){
     var matriz = new Array(size);
         for(i = 0; i < size ; i++){
                matriz[i]=new Array(size);

          }
     return matriz;
 }

to be continue

How to use Reduce in javascript?

Valentin Antonio — Sun, 15 Sep 2019 04:29:36 +0000

The reduce() method is used to apply a function to each element in the array to reduce the array to a single value.

Example:


const ages = [33,12,20,16,5,54,21,44,23,55,45,90];

let ageSum = 0;

for(let i=0; i < ages.length; i++){
     ageSum += ages[i];
  }
//result
console.log(ageSum);
// 418

The method:

const ageSum = ages.reduce((total,age) => total + age ,0);
//result
console.log(ageSum);
// 418

Great flexbox game to test your CSS skills

Valentin Antonio — Thu, 18 Jul 2019 15:03:38 +0000

Understanding Flexbox: Everything you need to know.

https://flexboxfroggy.com/#us