How To Count Array Elements Inside An Array In Javascript?

I have an array as follows in nodejs var dataary=[]; dataary=[ [ 'reg_no', 'slno', 'name', 'email', 'rollno' ], [ 'int', 'int', 'varchar', 'varchar', 'int' ], [ '100',

Solution 1:

With map you can get all lengths in one array and then you can sum them or do whatever you want to do.

var allLengths = dataary.map(element => {
   return element.length;
});

Solution 2:

Iterate through loop and get length of each individual array .The forEach() method executes a provided function once for each array element.

var dataary=[];
    dataary=[ [ 'reg_no', 'slno', 'name', 'email', 'rollno' ],
    [ 'int', 'int', 'varchar', 'varchar', 'int' ],
    [ '100', '11', '255', '255', '100' ] ,
    [ '1', '2', '3' ]]
    dataary.forEach(function(element) {
    console.log(element.length);
    });

Solution 3:

I would do it that way...

dataary.reduce((count, innerArray) => count + innerArray.length, 0);