Method parameters in C#

Defaults and named arguments make call sites read like sentences.

Console.WriteLine(Greeter.Hello("Ada"));
Console.WriteLine(Greeter.Hello("Grace", shout: true));
Console.WriteLine(Greeter.Area(3, height: 4));

static class Greeter
{
    public static string Hello(string name, bool shout = false)
    {
        var text = $"hello, {name}";
        return shout ? text.ToUpper() : text;
    }

    public static double Area(double width, double height) =>
        width * height / 2;
}

How it works

1. bool shout = false gives callers a default they can skip.
2. shout: true names the argument, so the call explains itself.
3. Expression-bodied Area writes a one-line method in one line.

Keywords and builtins used here

• Area
• Greeter
• Hello
• bool
• class
• double
• false
• public
• return
• static
• string
• true
• var

The run, in numbers

Lines

15

Characters to type

379

Tokens

98

Three-star pace

90 tpm

At the three-star pace of 90 tokens a minute, this run takes about 65 seconds.

Type this snippet

Step 1 of 3 in Methods, step 15 of 29 in Language basics.

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