nested for loop javascript

// Basic Javascript Nested Loop / 2D Array

for (var x = 0; x < 10; x++) {
	for (var y = 0; y < 10; y++) {
    	console.log("x: " + x + ", y: " + y);
    }
} var arr = [[1,2], [3,4], [5,6]];
 for (var i=0; i < arr.length; i++) {
  for (var j=0; j < arr[i].length; j++) {
    console.log(arr[i][j]);
  }
}for (let exercise = 1; exercise <= 3; exercise++) {
   console.log(`---------- Starting exercise ${exercise}`)

   for (let rep = 1; rep <= 6; rep++) {
      console.log(`Exercise ${exercise}: Lifting weight repetitition ${rep}`);
   }
}function multiplyAll(arr) {
  var product = 1;
  // Only change code below this line
  for (var i=0; i<arr.length; i++ ){
    for (var j=0; j<arr[i].length; j++){
      product*=arr[j];
     
    }
  }
  // Only change code above this line
  return product;
}

// Modify values below to test your code
multiplyAll([[1,2],[3,4],[5,6,7]]);