What is the answer and why ? (JavaScript/Increments)

Question

What will be alerted?

n = 2;
m = (n++ * 12);
alert(m);

Sololearn says the answer is 24.

How is this? Why is it not 36?

Answer 1

The answer is 24, because n++ is a postfix increment.
For instance if:
n = 2
m = n++
ans:
m = 2, n = 3.
m is assigned the value of n before n is incremented.

But in prefix increment:
n = 2
m = ++n
ans:
m = 3, n = 3.
n is incremented first and then assigned to m.

Answer 2

No Zone because the question says:
m = (n++ *12);
alert(m);

At end of the code n is still 3 as there is no operation on it after incrementing.

Answer 3

Zone happy to help

Answer 4

you are using a Postfix increment entry where the value of the variable changes by one after it is used in the alert output expression

Answer 5

it depends what you want to use it for. if the variable does not need to be output immediately, there will be no difference for you. any option will do. try to practice in different ways such as in a cycle and feel the difference. you can find an article in Google on this issue and delve, but for a clear understanding it is better to try it yourself. Just remember that in a Postfix notation, the expression first uses the old value and then increments or decrements it by one

Answer 6

36 you will receive in this case: if you do not use the increment in the next line

...
alert(m); //end of your code 24
m = (n*12);
alert(m); //36 becouse n was +1

Answer 7

check out these points in the codes section { }

Answer 8

Meny Evolving shouldn't the answer be 36 then since you said n = 3 ?

Answer 9

You can put this code in code section { } and show us here?

Answer 10

Calviղ that was a typo on my end. I meant to type 24.

Answer 11

Ярослав Вернигора (Yaroslav Vernigora) so are you saying i shouldn't be using postfix increment entry?