更新小部分

learn/basic/advanced_type/struct.md

@@ -22,7 +22,7 @@ outline: deep
 
 ::: code-group
 
-```zig [结构体]
+```zig [default]
 const Circle = struct {
     radius: u8,
 
@@ -38,7 +38,7 @@ const Circle = struct {
 };
 ```
 
-```zig [完整示例]
+```zig [more]
 const std = @import("std");
 
 const Circle = struct {
@@ -77,7 +77,7 @@ pub fn main() void {
 
 ::: code-group
 
-```zig [结构体]
+```zig [default]
 const User = struct {
     userName: []u8,
     password: []u8,
@@ -112,7 +112,7 @@ const User = struct {
 };
 ```
 
-```zig [完整示例]
+```zig [more]
 const std = @import("std");
 
 var gpa = std.heap.GeneralPurposeAllocator(.{}){};
@@ -260,13 +260,13 @@ const x = Foo{
 
 ::: code-group
 
-```zig [结构体]
+```zig [default]
 const Empty = struct {
     // const PI = 3.14;
 };
 ```
 
-```zig [完整示例]
+```zig [more]
 const std = @import("std");
 
 const Empty = struct {
@@ -468,7 +468,7 @@ test "overaligned pointer to packed struct" {
 
 ::: code-group
 
-```zig [源代码]
+```zig [default]
 const std = @import("std");
 
 pub fn main() void {
@@ -485,7 +485,7 @@ fn List(comptime T: type) type {
 }
 ```
 
-```sh [输出]
+```sh [output]
 variable: struct_name.main.Foo
 anonymous: struct_name.main__struct_3509
 function: struct_name.List(i32)

learn/basic/process_control/decision.md

@@ -29,13 +29,13 @@ zig 中的三元表达式是通过 `if else` 来实现的：
 
 ::: code-group
 
-```zig [简略]
+```zig [default]
 const a: u32 = 5;
 const b: u32 = 4;
 const result = if (a != b) 47 else 3089;
 ```
 
-```zig [完整]
+```zig [more]
 const print = @import("std").debug.print;
 
 pub fn main() !void {

learn/basic/process_control/loop.md

@@ -6,4 +6,8 @@ outline: deep
 
 <!-- 讲解标签 blocks break -->
 
-TODO
+在 zig 中，循环分为两种，一种是 `while`，一种是 `for`。
+
+## `while`
+
+## `for`

learn/basic/union.md

@@ -4,4 +4,38 @@ outline: deep
 
 # 联合类型
 
-TODO
+联合类型(union)，它实际上用户定义的一种特殊的类型，划分出一块内存空间用来存储多种类型，但同一时间只能存储一个类型。
+
+联合类型的基本使用：
+
+::: code-group
+
+```zig [default]
+const Payload = union {
+    int: i64,
+    float: f64,
+    boolean: bool,
+};
+
+var payload = Payload{ .int = 1234 };
+
+print("{}\n",.{payload.int});
+```
+
+
+```zig [more]
+const print = @import("std").debug.print;
+
+const Payload = union {
+    int: i64,
+    float: f64,
+    boolean: bool,
+};
+
+pub fn main() !void {
+    var payload = Payload{ .int = 1234 };
+
+    print("{}\n", .{payload.int});
+}
+```
+:::