CODEWITHSUNDEEP
javascripthtml
med benzekri
med benzekri

Reputation: 603

creating 2d array in JavaScript

I am a newbie at js and trying to create a 2D array but when I run the code I get in the console Array(10) [ <10 empty slots> ] even though I filled the array with values.
This is my js and HTML: 

function Make2Darray(cols, rows) {
  let arr = new Array(cols);
  for (let i = 0; i < arr.lenght; i++) {
    arr[i] = new Array(rows);
    for (let j = 0; j < rows; j++) {
      arr[i][j] = floor(random(2));
    }
  }
  return arr;
}
let grid;
grid = Make2Darray(10, 10);
console.log(grid);
<!DOCTYPE html>
<html>

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1">

  <title>Game of Life</title>

  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/lib/p5.min.js"></script>

  <script type="text/javascript" src="gol.js"></script>
</head>

<body>
</body>

</html>

Upvotes: 0

Views: 77

Answers (2)

hco
hco

Reputation: 677

I am not sure what you are trying to do with floor(random(2)) part, but you can create 2D array as below:

function Make2Darray(rows, cols) {
  let arr = []
 
  for (let i = 0; i < rows; i++) {
    arr[i] = []
    for (let j = 0; j < cols; j++) {
      arr[i][j] = Math.floor(Math.random()) // You can change the value in this part
    }
  }
 
  return arr
}

let grid = Make2Darray(10, 10)
console.log(grid)

Upvotes: 0

Esteban MANSART
Esteban MANSART

Reputation: 561

You made 2 mistakes : one the 3rd line, this is not arr.length that you want but cols Then, floor and random are parts of the Math lib provided by JS, so use it like this:

arr[i][j] = Math.floor(Math.random() * 2);

Upvotes: 1

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