Multiple conditions in While loop JS

Question

I don't really see how this could be wrong code.
In few examples, there is no output at all or it's only "10" in this one.

var num2 = 10;
while (num2 >= 10 && num2 <= 40 && num2%2===0){
    console.log(num2);
    num2++;
}

or like this:

var num2 = 10;
while (num2 >= 10 && num2 <= 40){
    if (num2%2===0){
    console.log(num2);
    num2++;
}}

Answer 1

Your first loop stops after the first iteration because 11 is not an even number, so num2%2===0 is false .

Your second loop never stops because it only increments num2 if it's even (from 10 to 11 ), but 11 is not even and so num2 never changes.

Fix:

 var num2 = 10; while (num2 >= 10 && num2 <= 40) { if (num2%2===0) { console.log(num2); } num2++; } 

Ie always increment num2 , but only print the even numbers.

Alternatively:

 var num2 = 10; while (num2 >= 10 && num2 <= 40) { console.log(num2); num2 += 2; } 

Ie start at an even number and always increment by 2.