CODEWITHSUNDEEP
javascript
user3718511
user3718511

Reputation: 335

How to access 2D array using single for loop in JavaScript?

I have a 2D array which has 10 rows and 10 columns and I want to access a column's element from each row like this:

myArray[0][9]
myArray[1][4]
myArray[2][5]
myArray[3][9]
myArray[4][5]
myArray[5][9]
myArray[6][8]
myArray[7][9]
myArray[8][7];  
myArray[9][8]

The code that I have used:

for(var i=0; i<theatregoers.length; i++)
    {
       myArray[i][9].position=true;
      
       
    }

Note: I do not have any idea how to change column numbers like this each time when loop run. I do not want to use the nest loop, just using a single loop.

Upvotes: 4

Views: 133

Answers (2)

Karl L
Karl L

Reputation: 1725

You can do something like this. put the column indexes/number in an array like:

  let colArray = [9,4,5,9,5,9,8,9,7,8] 
    
  for(var i=0; i<myArray.length; i++){  
        myArray[i][colArray[i]].position=true;              
     }

Upvotes: 5

catcon
catcon

Reputation: 1363

You can loop your array like this

var row = 10;
var column = 10;

for (var i = 0; i < row * column; i++) {
     myArray[Math.floor(i / row)][i % column].position = true;
}

Upvotes: 2

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