What advantages does using var have over the explicit type in C#? [duplicate]
The point of var is to allow anonymous types, without it they would not be possible and that is the reason it exists. All other uses I consider to be lazy coding.
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Using var outside of a method
My article on the subject: Why no var on fields? To summarize: If we have “var” fields then the type of the field cannot be determined until the expression is analyzed, and that happens after we already need to know the type of the field. What if there are long chains, or even cycles in … Read more
Kotlin function parameter: Val cannot be reassigned
Function parameters in Kotlin are basically read-only val‘s inside the function, so z here will always refer to the original object that was passed in. If you need to modify what it points to while your function is running, you’ll have to make a local copy of it at the beginning of the function, and … Read more
When to use var in Javascript [duplicate]
When you use var , you are instantiating a variable in the current scope. This will also prevent access of variables named the same in higher scope, within the current scope. In your first example, ‘a’ is being instantiated and set within the function scope. In your second example, ‘a’ is being set outside the … Read more
Difference between “var” and “dynamic” type in Dart?
dynamic is a type underlying all Dart objects. You shouldn’t need to explicitly use it in most cases. var is a keyword, meaning “I don’t care to notate what the type is here.” Dart will replace the var keyword with the initializer type, or leave it dynamic by default if there is no initializer. Use … Read more
How to convert an Int to a Character in Swift
You can’t convert an integer directly to a Character instance, but you can go from integer to UnicodeScalar to Character and back again: let startingValue = Int((“A” as UnicodeScalar).value) // 65 for i in 0 ..< 26 { print(Character(UnicodeScalar(i + startingValue))) }
How to create LINQ Query from string?
You have a few options: Use the the Dynamic Linq libraries to construct you queries on the fly. The best place to get started is by reading ScottGu’s blog entry. However, I don’t think these libraries support the contains method in your example. Here is a blog post explaining how to add this support. Directly … Read more
ReferenceError: variable is not defined
It’s declared inside a closure, which means it can only be accessed there. If you want a variable accessible globally, you can remove the var: $(function(){ value = “10”; }); value; // “10” This is equivalent to writing window.value = “10”;.
Why there are two ways of declaring variables in Go, what’s the difference and which to use?
The Variable declarations make it clear that variables are declared. The var keyword is required, it is short and expresses what is done (at the file level everything excluding comments has to start with a keyword, e.g. package, import, const, type, var, func). Like any other block, variable declarations can be grouped like this: var … Read more
What is the equivalent of the C# ‘var’ keyword in Java?
There is none. Alas, you have to type out the full type name. Edit: 7 years after being posted, type inference for local variables (with var) was added in Java 10. Edit: 6 years after being posted, to collect some of the comments from below: The reason C# has the var keyword is because it’s … Read more