JavaScript 'if' alternative [duplicate]

Answer 1

As to the need for this sort of coding:

You can sometimes use the ternary operator to reduce complexity:

For example, I have a web page which needed to verify that at least two out of three specific text fields had values entered. The if/else logic looked pretty ugly, but the ternary operator made it a one-liner to determine how many fields were filled in:

var numberFilledInFields = ( (firstName.length > 0 ? 1 : 0) +
                     (lastName.length > 0 ? 1 : 0) +
                     (zipCode.length > 0 ? 1 : 0) );

if (numberFilledInFields < 2)
{
    validation = false;
    return;
}

This solution appears quite elegant and easy to read than some alternatives.