[Explanation] How assignment operators work.

Question

For example:
We want to calculate (x) and (y) using the (+=) operator.

var (y) is assigned to let's say 10 (var y = 10;)

var (x) will be whatever the user inputs. Let's say my input is 4.

So, I want to find out the value of (x += y)

In more detail:

var y = 10;
var x = //user input, or in this case 4.

var x = x + y;
var x = //changes from 4 to 14.

//The output of var (x) would be 14.

The same calculation can be performed like this.

var y = 10;
var x = //user input, or in this case 4.

var n = x + y;

//The output of var (n) would be 14.

Note: We used 3 variables (x), (y) and (n). Whereas using the (+=) operator, we only used 2, (x) and (y), but (x) acts as two variables.

Value is temporarily stored to var (x) in this case it's 4.
Addition (+) var x = 4 + 10; or var x += y;
The result (14) is reassigned (=) to var (x).

https://jsfiddle.net/7e1x71Lo/6/

This works the same for any other assignment operator. Also, my explanation might be wrong. So, feel free to correct me.

Answer 1

Thumbs up, nice explanation ;)

Answer 2

x and y are just some values

Answer 3

what is x and y? sorry if it is a stupid question. I know that it is horizontally and vertically, but what does that have to do with this?