How to iterate array with nested arrays using for loop?

Question

this code is only iterating the first 9 nos in the nested array.

var arr = [[[1,2,3,4,5,6,7,8,9],[1,2,3,4]]];
 for (var i=0; i < arr.length; i++) {
 for(var j = 0; j < arr[i].length; j++) {
 for(var k = 0; k < arr[j].length; k++){
 console.log(arr[i][j][k]); 
 }; 
 }; 
};

• Barmar: The third loop should use arr[i][j].length
• Ala Eddine Menai: Is it necessary to use for-loop for you ?
• Rajesh V R: Hi Menai - did you mean there is a better method? pl suggest.

Answer 1

The Problem is with the third loop. Corrected Code -

for (var i=0; i < arr.length; i++) {
 for(var j = 0; j < arr[i].length; j++) {
 for(var k = 0; k < arr[i][j].length; k++){
 console.log(arr[i][j][k]); 
 }; 
 }; 
 };

Answer 2

You had missed an iterator on your second loop Here

for(var i=0;i<arr.length;i++){
for( var j=0;j<arr[i].length;j++){
 for (var k=0;k<arr[i][j].length;k++)
 console.log(arr[i][j][k]);
}

}

Answer 3

You can also use Foreach as an alternative way to loop your array.

 const iterate = (arr) =>
 arr.forEach((arrOne) =>
 arrOne.forEach((arrTwo) => arrTwo.forEach((value) => console.log(value)))
 );