Javascript - creating a function with two arguments and returning 2d array

Question

I need to write a function which takes two arguments - rows and columns. The purpose of this function is returning 2d array with given numbers and rows. I need to return the array by using the function. Here's a code:

I'm a beginner and every feedback will be strongly appreciated. :-)

I've checked StackOverflow, I've tried to google it, check appropriate websites - unfortunately, no luck

function create2Darray(A) {
            var columns = [];
            var rows = Math.sqrt(A.length);
            for (var i = 0; i < rows; i++) {
                  columns[i] = [];
                  for (var j = 0; j < rows; j++) {
                        columns[i][j] = A[i * rows + j];
                  }
            }
            return columns;
      }

Your question is unclear. The code you have posted converts a 1D array to a 2D array matrix with equal number of rows an columns. But the title says you want to create a function with 2 parameters? — adiga
– adiga, Commented May 3, 2019 at 6:57

Nina Scholz · Accepted Answer · 2019-05-03 07:08:55Z

1

You could use Array.from with an object with the length and map with the second parameter the inner arrays.

const
    getArray = (l, w) => Array.from({ length: l }, (_, i) =>
        Array.from({ length: w }, (_, j) => i * w + j));

console.log(getArray(3, 2));

.as-console-wrapper { max-height: 100% !important; top: 0; }

answered May 3, 2019 at 7:08

Nina Scholz

388k26 gold badges367 silver badges417 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Maheer Ali · Accepted Answer · 2019-05-03 07:12:53Z

Your question statement doesn't match the code you tried. It seems you want to convert single dimensional array to 2D array. Your code is fine. But the problem is that Math.sqrt(A.length); may return float and i * rows + j will become float and array don't have float indexes. Just use Math.ceil() to fix

function create2Darray(A) {
     var columns = [];
     var rows = Math.ceil(Math.sqrt(A.length));
     for (var i = 0; i < rows; i++) {
        columns[i] = [];
        for (var j = 0; j < rows; j++) {
            columns[i][j] = A[i * rows + j];
        }
    }
    return columns;
}

console.log(create2Darray([1,2,3,4,5,6,7,8]))

The following two solution are for function which takes length and width.

function array(l,w){
  let res = [];
  for(let i = 0; i < l;i++){
    res[i] = [];
    for(let j = 0; j < w; j++){
      res[i][j] = (w * i) + j
    }
  }
  return res;
}
console.log(JSON.strigify(array(3,2)))

A on liner can be made using nested map()

const array = (l,w) => [...Array(l)].map((x,i) => [...Array(w)].map((x,j) => (i*w) + j))
console.log(JSON.stringify(array(3,2)))

Collectives™ on Stack Overflow

Javascript - creating a function with two arguments and returning 2d array

2 Answers 2

Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related