CODEWITHSUNDEEP
javascriptarraysfor-loop
iskandarblue
iskandarblue

Reputation: 7526

Loop through arrays within arrays

I have a for loop that logs the coordinate array of each feature in my feature layer. Oddly, however, the 33rd element of the feature layer is an array of 3 arrays - with lengths 16, 58, and 246. How can I access these arrays which are one level deeper - and log them to the console as well?

enter image description here

if (data.features.length > 0) {
    for(var i = 0; i < features.length; i++){
        console.log(i, features[i].geometry.coordinates)
    }
}

Upvotes: 1

Views: 222

Answers (2)

Pritam Banerjee
Pritam Banerjee

Reputation: 18968

Another Solution is to just check if the Object inside an array is an instance of an Array or not.

If it is an instance of another array just call that function recursively.

The solution looks like the following:

var arr = [1, 2, [4,5,6], [9,5,6,7]];
printArray(arr);
printArray(null);

function printArray(arr){
    if(arr == null || arr == undefined){
      return;
    }
    
    if(arr.length == 0){
      return;
    }
    
    for(var i = 0; i < arr.length; i++){
        if(arr[i] instanceof Array){
           printArray(arr[i]);
        } else{
           console.log(arr[i]);
        }
    }
}

Upvotes: 0

Alberto Trindade Tavares
Alberto Trindade Tavares

Reputation: 10396

You can use recursion like below:

function iterateArray(array) {
  array.forEach((item) => {
    if (Array.isArray(item)) {
      iterateArray(item);
    }
    else {
      console.log(item);
    }
  });
}

var array = [1, 2, [3, 4, 5], [6, [7, [8, 9]]]];

iterateArray(array);

Upvotes: 3

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