Array comparation in javascripts

Question

I would like to compare arrays nested in arrays.

For example, I have an array like this:

var myArrays = [[1,2],[1,2,3],[1,5,6,7,2.3,4],[1,2,3,2],[1,2,3],[1,2,3]];

How could I know the difference length of each array from loop step by step? I'm looking for an algorithm that will help solve this problem.

Thanks.

Answer 1

Use the map function. It accepts as the first parameter each item in your array and will return an array of what you will return from it . In your case you need to return the length of your every nested array.

 var myArrays = [[1,2],[1,2,3],[1,5,6,7,2.3,4],[1,2,3,2],[1,2,3],[1,2,3]]; var lengths = myArrays.map(arr => arr.length); console.log(lengths); 

For IE

 var myArrays = [[1,2],[1,2,3],[1,5,6,7,2.3,4],[1,2,3,2],[1,2,3],[1,2,3]]; var lengths = myArrays.map( function(arr) { return arr.length; }); console.log(lengths); 

Answer 2

'data' array is a multi-dimensional array which you can iterate through it like below and find for example size of each one.

      for(var i = 0; i < 10; i++) {
            for(var j = 0; j < 10; j++) {
                if(data[i][j].length > 0) {
                    do sth on data[i][j]....
                }
            }
        }