Lists and MapFiltered

• Category: Lists, Tuples and Options
• Description: Project from a list with filtration
• Code:

using Nemerle;
using Nemerle.Collections;
using System;
using System.Console;

def data = [("Cats", 4),
            ("Bears", 5),
            ("Mice", 3),
            ("Elephants", 2)];
def res = data.MapFiltered((x, _) => x.Length <= 4, (x, y) => (x, x.Length, y));
WriteLine($"Count animals with short names: $res")

• Execution Result:

Count animals with short names: [(Cats, 4, 4), (Mice, 4, 3)]

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