Local functions are another very handy feature to be introduced into language if you are into code refactoring. Many a times developers create a very large method and while code review we see lot of places same logic has been repeated and thus think about refactoring it. Problem is that if the logic is required only at multiple places within same method than it’s not a good idea to make it into a separate named method.

Let’s take an example in C# 6 and then we will try to refactor that using various ways and finally with local functions feature in C# 7.0

Here is a simple code that works on array of numbers and calculates sum and subtraction of each number in array

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Expression bodied members were introduced in C# 6.0. You can read more about those here

C# 7.0 introduced more stuff like accessors, finalizer’s and constructors as expression bodied members

Expression Bodied Syntax for constructors

public CSharp7Features(string someData) => Console.WriteLine("Constructor called with {0} in c# 7 feature", someData);

Expression Bodied Syntax for Finalizers

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Important points regarding ref in C#

• ref keyword is used to return more than one values from a function.
• ref keywords need to be defined before you can pass them as a parameter to function
• Called method is not bound to assign any value to the ref parameter since it has already been initialized by calling method

Case Study

We need to find if a number i.e. 4 exist in an array and if exist we would like to change its value to 111

Example using C# 6.0

Consider below extension method which returns index of a number if it’s found in array

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C# 7.0 introduces Number literals as well as Binary Literals

These are completely new features that adds syntactic sugar to C# while dealing with number and binary data.

You can now declare numeric variables as below while adding (Underscore) _ as a separator for readability. This is handy while dealing with large numbers

One important thing to understand about these separator literals is that these are ignored by compiler while evaluating the value and are just meant to provide readability.

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out/ref keyword has been used to return more than one values from a function.
ref keywords need to be defined before you can pass them as a parameter to function but on the other hand out variables need not be initialized before they can be passed as a parameter to a function.
In case of ref, the called method is not bound to assign any value to the ref parameter since it has already been initialized by calling method but in case of out, the called method has the responsibility of assigning value of out parameter failing which results in a compile time error.
Problem with the out keyword in past was that we need to declare out Parameter before it can be passed as argument
Before C# 7.0
Usage of out parameter

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