But what if I already declared one variable at the beginning of the code and now I want to change it to something else? Or what if I want to declare one variable and use it in several other places in the code? I wrote this blog post to help you figure out your code’s best course of action, so you can make your life easier.
The first thing anyone should know about is that variable declarations in the code are just that, declarations. I know you probably think this is the case but you will find that a very large number of people (and code in general) will go out of their way to declare variables of the same type more than once.
In general, variable declarations are only a suggestion to the compiler, so they are not rules. When you see a variable declaration inside a statement, it is actually a declaration of a variable of the same type. However, this does not mean that it is valid to use the variable in the same place multiple times in the same line of code. The compiler only declares variables in a statement to try to help with readability and understanding.
The rule is this: if you see multiple variable declarations in one line of code, it’s likely you’re declaring the same variable multiple times.
For example, let’s say you’ve declared that you want to do one thing and then later you want to do another thing. This is a valid declaration of a variable. But in this case, you could just as well just have declared one variable and written “do one thing” and then used the variable in the same statement.
This is also a valid rule for a variable to be declared multiple times. However, it doesn’t apply to variables declared after you’ve already begun declaring them. This is because if you declare a variable twice, you aren’t actually declaring the same variable twice. But if you only declare it once, then you’re only declaring it once, and you should take care to avoid multiple declarations.
The point is, the problem is with multiple declarations, which are not valid, because variables declared more than once are not allowed to refer to the same variable. Just like we can have multiple variables, we can have multiple functions, and multiple statements inside a single function or multiple statements in a single statement. This is why we dont need to have multiple declarations.
In the case of multiple statements inside a single function or multiple statements in a single statement, the compiler will complain because its trying to treat them as separate statements. But that is a problem only if you’re doing it wrong.
So what you really want to do is have a single function that has multiple statements inside it. It doesnt matter if youre calling the function a few times, or calling it once. It doesnt matter if youre inside the function or not. It just matters that you declare a variable of the same name.
This is what I like to call the “single statement rule.” In other words, if you declare a variable with the same name as a function, then the compiler will treat those two things as one statement. You can also declare multiple variables inside a single statement, which means the compiler will treat them as separate statements.