Refactor javascript code

Refactor JavaScript snippet for given problem statement.

var arr1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
var arr2 = [1, 2, 3, 4, 5, 6];
var arr3 = [11, 22, 5, 6];
var arr4 = ["tom","cat","bob"];

arr1.foreach{
// length = 7
 //do something
}
arr2.foreach{
// length = 6
 //do something
}
arr3.foreach{
// length = 4
 //do something
}
arr4.foreach{
// length = 3
 //do something
}

Below code fulfill my objective but it's checking un-necessary condition for arr4 (7 times instead of 3),
arr3 (7 times instead of 4),
arr2 (7 times instead of 6)
because it's inside max length 7 iteration.

const zip = (...arr) => Array.from(
  { length: Math.max(...arr.map(a => a.length)) }, 
  (_, i) => arr.map(a => a[i] || null )
  );

var arr1 = ['a', 'b', 'c', 'd', 'e', 'f', 'g'];
var arr2 = [1, 2, 3, 4, 5, 6];
var arr3 = [11, 22, 5, 6];
var arr4 = ["tom","cat","bob"];

var a = zip(arr1,arr2,arr3,arr4);


a.forEach(function(item, index, array) {
    //console.log(index, item);
    console.log("--------------------");
    (item[0] === null) ? "nothing" : console.log("first array " + item[0]);
    (item[1] === null) ? "nothing" : console.log("second array " + item[1]);
    (item[2] === null) ? "nothing" : console.log("third array " + item[2]);
    (item[3] === null) ? "nothing" : console.log("third array " + item[3]);

});