... based on itsprevious value. For example counter = counter + 1. JavaScript provides ashortcut for this: counter += 1. This also works for many other operators, for example result *= 2 to double ... isupdated.A lot of loops fall into this pattern. For this reason, JavaScript, and similarlanguages, also provide a slightly shorter and more comprehensive form: for (var number = 0; number <= 12; number ... This is very convenient.You don't have to gather building material for your values, or pay for them,you just call for one and woosh, you have it. They are not created from thinair, of...