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I want to assign a variable to an initial value of null, and assign its value in the next if-else block, but the compiler is giving an error,
Implicitly-typed local variables must be initialized.
How could I achieve this?
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value − Any value to initialize the variable. By default, it is zero.
The way of initializing a variable is very similar to the use of PARAMETER attribute. More precisely, do the following to initial a variable with the value of an expression: add an equal sign (=) to the right of a variable name. to the right of the equal sign, write an expression.
If the variable is in the scope of of a function and not a member of a class I always initialize it because otherwise you will get warnings. Even if this variable will be used later I prefer to assign it on declaration. As for member variables, you should initialize them in the constructor of your class.
var variables still have a type - and the compiler error message says this type must be established during the declaration.
The specific request (assigning an initial null value) can be done, but I don't recommend it. It doesn't provide an advantage here (as the type must still be specified) and it could be viewed as making the code less readable:
var x = (String)null;
Which is still "type inferred" and equivalent to:
String x = null;
The compiler will not accept var x = null because it doesn't associate the null with any type - not even Object. Using the above approach, var x = (Object)null would "work" although it is of questionable usefulness.
Generally, when I can't use var's type inference correctly then
The second approach can be done by moving code into methods or functions.
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