I would recommend a Regular Expression test
Also -2 - 5 = ?
NaN
Some users have a (+-) button to change the number to a negative or positive.
(I didn't)
I just detected it in my code
could you tell me about object literal vs singleton class
the answers i find online are too techincal
and beyond my current understanding
also about adding comments, does my comments make sense? is this the way to explain code or can you tell me what I'm doing wrong there
Comments are great. You are a rare example to many coders who don't bother commenting!!
I would say some are not necessary (for me) but if you are in the habit of writing comments, stick at it!
I'm confused which is to use when
Very useful
Singleton class I think means you can only have once instance of that class
This is used a lot these days with modules in node for example
So you get lots of plugins for node that add functionality to your code -
These should be imported once and from then on you refer to that one instance of the module.
As in
const x = new Calc
I think this is instantiating a class
this is what confuses me
This is probably the difference then.
Not sure. I would have to read up on it more.
Thanks :)
@siliconchild Semantically Object literals and Classes are different thing. Classes are literal syntactical sugar for:
function Car (name){
this.name = name
}
Car.prototype.sound = function(){
console.log("vroom");
}
// class syntax
class Car {
constructor(name){
this.name = name;
}
sound(){
console.log("vroom");
}
}