Help with JavaScript problem.

tincat

M150 TMA 02 (09B) Hi all, I'm really stuck on a problem as I can't seem to get it to sink in after re reading the textbook and stuff. Could anyone tell me if I'm on the right track with my answers (in blue).



Two variables have been set as follows:


firstVar = 2
secondVar = 4


The following lines of JS are executed in sequence, and you should write down value of firstVar and secondVar after each line is executed:


a)firstVar = secondVar
b)secondVar = firstVar
c)firstVar = firstVar + secondVar / 2

(a) firstVar = secondVar, so firstVar = 4.

(b) secondVar = firstVar, so firstVar = 4.

(c) firstVar = firstVar + secondVar/2.
=firstVar = 4 + (4/2)
=firstVar = 6

As far as I can understand, it doesn't matter what the declared values are, as you can specify them as something else and from that point on, the variable takes on the new specified value


I have no idea whether I'm correct so if anyone can explain it to me I'd be really grateful. Thanks

FreheitOverture

Yes, that seems about right

RobTang

tincat wrote: »

As far as I can understand, it doesn't matter what the declared values are, as you can specify them as something else and from that point on, the variable takes on the new specified value

Yes BUT only for value / immutable types.

if you assign a reference type to another reference type both become a reference to the same object. so changing one variable will effect both.