add en/tuple.md

en/src/SUMMARY.md

@@ -14,7 +14,7 @@
   - [string](compound-types/string.md)
   - [Array](compound-types/array.md)
   - [Slice](compound-types/slice.md)
-  - [Tuple todo](compound-types/tuple.md)
+  - [Tuple](compound-types/tuple.md)
   - [Struct todo](compound-types/struct.md)
   - [Enum todo](compound-types/enum.md)
 - [Flow Control todo](flow-control.md)

en/src/compound-types/tuple.md

@@ -1 +1,76 @@
-# tuple
+# Tuple
+🌟 Elements in a tuple can have different types. Tuple's type signature is `(T1, T2, ...)`, where `T1`, `T2` are the types of tuple's members.
+```rust,editable
+
+fn main() {
+    let _t0: (u8,i16) = (0, -1);
+    // Tuples can be tuple's members
+    let _t1: (u8, (i16, u32)) = (0, (-1, 1));
+    // fill the blanks to make the code work
+    let t: (u8, __, i64, __, __) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
+}
+```
+
+🌟 Members can be extracted from the tuple using indexing.
+```rust,editable
+
+// make it works
+fn main() {
+   let t = ("i", "am", "sunface");
+   assert_eq!(t.1, "sunface");
+}
+```
+
+🌟 Long tuples  cannot be printed
+```rust,editable
+
+// fix the error
+fn main() {
+    let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
+    println!("too long tuple: {:?}", too_long_tuple);
+}
+```
+
+🌟 Destructuring tuple with patter.
+```rust,editable
+
+fn main() {
+    let tup = (1, 6.4, "hello");
+
+    // fill the blank to make the code work
+    let __ = tup;
+
+    assert_eq!(x, 1);
+    assert_eq!(y, "hello");
+    assert_eq!(z, 6.4);
+}
+```
+
+🌟🌟 Destructure assignments.
+```rust,editable
+fn main() {
+    let (x, y, z);
+
+    __ = (1, 2, 3);
+    
+    assert_eq!(x, 3);
+    assert_eq!(y, 1);
+    assert_eq!(z, 2);
+}
+```
+
+🌟🌟 Tuples can be used as function arguments and return values
+```rust,editable
+
+fn main() {
+   // fill the blank to make it work
+   let (x, y) = sum_multiply(__);
+
+   assert_eq!(x, 5);
+   assert_eq!(y, 6);
+}
+
+fn sum_multiply(nums: (i32, i32)) -> (i32, i32) {
+    (nums.0 + nums.1, nums.0 * nums.1)
+}
+```

zh-CN/src/SUMMARY.md

@@ -14,7 +14,7 @@
   - [字符串](compound-types/string.md)
   - [数组](compound-types/array.md)
   - [切片](compound-types/slice.md)
-  - [元组 undo](compound-types/tuple.md)
+  - [元组](compound-types/tuple.md)
   - [结构体 undo](compound-types/struct.md)
   - [枚举 undo](compound-types/enum.md)
 - [流程控制 todo](flow-control.md)