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When should we use VAR?
It is recommended to use var only when it is necessary, that is, when the variable will be used to store an anonymous type or a collection of anonymous types. The complaint that var reduces readability is not shared by everyone.
When should I use VAR in JS?
4 Answers. 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.
When should I use var in C#?
var can only be used when a local variable is declared and initialized in the same statement; the variable cannot be initialized to null, or to a method group or an anonymous function. var cannot be used on fields at class scope. Variables declared by using var cannot be used in the initialization expression.
What is the difference between VAR and dynamic?
In implicitly typed variable, the type of the variable is automatically deduced at compile time by the compiler from the value used to initialize the variable. The implicitly typed variable concept is introduced in C# 3.0….Difference between var and dynamic in C#
| Var | Dynamic |
|---|---|
| It is introduced in C# 3.0. | It is introduced in C# 4.0 |
When to replace Var with an explicit type?
Use this refactoring to replace var in a local variable declaration with an explicit type. This refactoring applies to: Following are some reasons to declare a variable with an explicit type: To improve the code’s readability. When you don’t want to initialize the variable in the declaration.
How is the Var declaration different from the explicit declaration?
Of course, the interesting thing here is that it’s the var declaration that does what you expect and the explicit type declaration that does not. When using var you have to manually cast, whereas with the explicit type declaration the compiler inserts the cast for you.
When to declare a variable with an explicit type?
Following are some reasons to declare a variable with an explicit type: To improve the code’s readability. When you don’t want to initialize the variable in the declaration. However, var must be used when a variable is initialized with an anonymous type and the properties of the object are accessed at a later point.
When to use VAR instead of the keyword var?
Our internal audit suggests us to use explicit variable type declaration instead of using the keyword var. They argue that using of var “may lead to unexpected results in some cases”. I am not aware of any difference between explicit type declaration and using of var once the code is compiled to MSIL.