What is the idiomatic naming convention for local functions in C# 7

Question

Normal class methods, whether instance or static, have an idiomatic naming convention with regards to their casing. It's not clear that there is a convention for local functions, introduced in C# 7.

Should a local function be named in camelCase?

public static int Factorial(int n) {     return calcFactorial(n);      int calcFactorial(int number) => (number < 2)         ? 1         : number * calcFactorial(number - 1); } 

Or PascalCase?

public static int Factorial(int n) {     return CalcFactorial(n);      int CalcFactorial(int number) => (number < 2)         ? 1         : number * CalcFactorial(number - 1); } 

Answer 1

My standard is always PascalCase, also spell out the full word. I don't like abbreviations as they can have multiple meanings.

So, in your PascalCase scenario, I would spell out the 'Calc' word to be the following:

public static int Factorial(int n) {     return CalculateFactorial(n);      int CalculateFactorial(int number) => (number < 2)         ? 1         : number * CalculateFactorial(number - 1); } 

Compilers have come along ways, and a few extra bytes to make it clear what the method does is worth the few extra keystrokes.