class logic questions
Hey, a few questions about the logic in classes-
1) If i define a
this. variable inside of a function, why can i use it outside of the function globally within the class? I understand it's because it uses this. and that refers to the object but that defies the regular logic of how that would work, is that specific functionality for this or classes? (example: https://codepen.io/deerCabin/pen/xbKYQPG)
2) Why don't i need to use const or var when defining this. variables?
3) Why don't i need to use the function keyword when defining functions within classes?
Thanks in advance.14 Replies
this is a special variable
in fact, it's a keywordoh okay that makes sense then. so it's all just a functionality of that keyword essentially?
how about the function keyword? (3))?
that's because classes are syntax sugar for objects without prototype
whoever at ecma decided that classes should be like that made it into the standard
you also don't need to use
var for propertieshm okay i see, thanks for the help
i know it is weird, but, sometimes the answer is "someone decided it for some reason"
yeah js seems to have these little curveballs in a lot of places haha
it does, and it is funny as hell
but i can see why they skipped the
function and var keywords
if it has parenthesis, it's a function - otherwise it's a variableI mean that does make sense but definitely throws you off when in other places those are needed
arrow functions fix that
arrow functions need the
() => which is equivalent to function in its own case right? Unless you mean in another way?in this situation, yes
but arrow functions don't change the value of
thisOh right yeah I see, you’d have to use
.bind for keeping the value of this for regular functions right?no, that's to change the value of
this
you can temporarily change the value with .call() and .apply()ah okay