loop through two dimensional array javascript code example

Example 1: nested array loop in javascript

let chunked = [[1,2,3], [4,5,6], [7,8,9]];

for(let i = 0; i < chunked.length; i++) {
  
   for(let j = 0; j < chunked[i].length; j++) {
     
      console.log(chunked[i][j]);
   }
}

Example 2: javascript loop over three-dimensional array

var items = [[['firstName', 'Joe'], ['lastName', 'Blow'], ['age', 42], ['role', 'clerk']], [['firstName', 'Mary'], ['lastName', 'Jenkins'], ['age', 36], ['role', 'manager']]];

var result = [];
// first loop through items
items.forEach(function(item)
{
   var obj = {};
   // then loop through properties
   item.forEach(function (value)
   {
      // then set property and value
      obj[value[0]] = value[1];
   });

   // once all is done push the object
   result.push(obj);
});

console.log(result);

Example 3: create multidimensional array javascript for loop

var squares = new Array();
for(var i = 0; i <= 8; i++)
{
    squares[i] = new Array();
    for(var j = (i * 20) + 1; j <= 20 * i + 20; j++)
        if (squares[i] == null)
            squares[i] = j;
        else
            squares[i].push(j);
}