方法与 self 参数
为您的结构体附加行为。
方法与 self 参数 是 CoddyKit 上的免费 Zig Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Zig Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Zig Academy 课程共包含 4 节课。
本课时的部分内容尚未翻译，以英文显示。
Data Plus Behavior
A struct can hold more than fields. You can declare methods inside it: functions that act on the data they belong to.
Functions Live Inside
Write a normal fn inside the struct body. It becomes namespaced under the type, callable as Type.name.
const Point = struct {
x: i32,
y: i32,
fn origin() Point {
return Point{ .x = 0, .y = 0 };
}
};The self Parameter
A method that works on an instance takes the value as its first parameter, named self by convention.
fn magnitude(self: Point) i32 {
return self.x + self.y;
}Call With a Dot
Call a method through an instance with a dot. Zig passes the instance as self automatically for you.
const p = Point{ .x = 3, .y = 4 };
const m = p.magnitude();self Is Just an Argument
There is no hidden magic. The dot call p.magnitude() is exactly the same as Point.magnitude(p).
const m = Point.magnitude(p);Reading self by Value
Taking self by value gives you a copy. That is fine for reading fields, but changes to it will not stick.
fn sum(self: Point) i32 {
return self.x + self.y;
}Mutating Needs a Pointer
To change fields, take self as a pointer with *Point. Now writes go to the original instance, not a copy.
fn moveRight(self: *Point) void {
self.x += 1;
}Auto-Reference on Call
When a method wants *Point, Zig takes the address of your var for you. You still just write p.moveRight().
var p = Point{ .x = 0, .y = 0 };
p.moveRight();Use @This for the Type
Inside the body you can refer to the enclosing type with @This(), handy when the type has no outer name yet.
const Counter = struct {
n: i32,
fn get(self: @This()) i32 {
return self.n;
}
};Methods Without self
A method need not take self at all. Constructors and helpers often skip it and act as plain namespaced functions.
fn init(x: i32, y: i32) Point {
return Point{ .x = x, .y = y };
}Organizing With Methods
Grouping behavior next to data keeps your code tidy. Methods make a struct read like a small, self-contained component.
Quick Check
What does a method need to change an instance's fields?
Recap
You added methods: functions inside a struct, with self as the instance. Use self: Point to read and self: *Point to mutate. 🔧
常见问题解答
「方法与 self 参数」课时是免费的吗？
是的 — 「方法与 self 参数」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Zig Academy 课程的其余内容，请升级到 CoddyKit PRO。 Zig Academy 课程共包含 4 节课。
「方法与 self 参数」这节课中我会学到什么？
为您的结构体附加行为。 你通过在浏览器中直接运行的动手代码来练习 Zig Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。
学习 Zig Academy 需要有经验吗？
无需任何先前经验。CoddyKit 上的 Zig Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。
「方法与 self 参数」课时需要多长时间？
大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。
我能在这节 Zig Academy 课中编写并运行代码吗？
能。每节 Zig Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。