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1. C# - Evaluate a mathematical express... C# - Evaluate a mathematical expression as a string

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   /*

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     An implementation of the Evaluate() function, 

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     similar to other programming languages,

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     wherein it evaluates string as an expression.

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2. C# - Null Checking Using C# 7 Discar... C# - Null Checking Using C# 7 Discards and the C# 9 Way

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   /**********************************************************************************

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     Discards (_) do not take up memory. These were introduced in C# 7. 

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     This code evaluates if variable name has a value then return. Else, throw ANE. 

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     Additionally, it uses the null-coalescing operator for null checks.