Using options for data

Using options for data

• Category: Lists, Tuples and Options
• Description: Here we return an option from a function indicating the opening hours of a shop, if any.
• Code:

using System;
using System.Console;
using Nemerle;

def openingHours(day)
{         // implicit match construction
  | DayOfWeek.Monday 
  | DayOfWeek.Tuesday 
  | DayOfWeek.Thursday 
  | DayOfWeek.Friday    => Some(9, 17)
  | DayOfWeek.Wednesday => Some(9, 19) // extended hours on Wednesday
  | _                   => None()
}
    
def today = DateTime.Now.DayOfWeek;

match (openingHours(today)) 
{
  | Some((s, f)) => WriteLine($"The shop's open today from $s:00-$f:00")
  | _            => WriteLine("The shop's not open today")
}

• Execution Result (in case of Wednesday):

The shop's open today from 9:00-19:00

• Execution Result (in case of Friday):

The shop's open today from 9:00-17:00

• Execution Result (in other cases)

The shop's not open today

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