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Simplify methods explanation in 047

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Arya-Elfren 2023-04-28 11:12:42 +01:00 committed by GitHub
parent 18f69f5634
commit 3612c67f04
1 changed files with 7 additions and 13 deletions
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20
exercises/047_methods.zig
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@ -18,14 +18,14 @@
//
// Foo.hello();
//
// 3. The NEAT feature of these functions is that if they take either
// an instance of the struct or a pointer to an instance of the struct
// then they have some syntax sugar:
// 3. The NEAT feature of these functions is that if their first argument
// is an instance of the struct (or a pointer to one) then we can use
// the instance as the namespace instead of the type:
//
// const Bar = struct{
// pub fn a(self: Bar) void { _ = self; }
// pub fn b(this: *Bar, other: u8) void { _ = this; _ = other; }
// pub fn c(bar: *const Bar) void { _ = bar; }
// pub fn a(self: Bar) void {}
// pub fn b(this: *Bar, other: u8) void {}
// pub fn c(bar: *const Bar) void {}
// };
//
// var bar = Bar{};
@ -37,10 +37,6 @@
// self, others use a lowercase version of the type name, but feel
// free to use whatever is most appropriate.
//
// Effectively, the method syntax sugar just does this transformation:
// thing.function(args);
// @TypeOf(thing).function(thing, args);
//
// Okay, you're armed.
//
// Now, please zap the alien structs until they're all gone or
@ -66,9 +62,7 @@ const HeatRay = struct {
// We love this method:
pub fn zap(self: HeatRay, alien: *Alien) void {
alien.health -|= self.damage; // Saturating inplace substraction
// It subtracts but doesn't go below the
// lowest value for our type (in this case 0)
alien.health -= if (self.damage >= alien.health) alien.health else self.damage;
}
};