add en/tuple.md
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- [string](compound-types/string.md)
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- [Array](compound-types/array.md)
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- [Slice](compound-types/slice.md)
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- [Tuple todo](compound-types/tuple.md)
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- [Tuple](compound-types/tuple.md)
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- [Struct todo](compound-types/struct.md)
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- [Enum todo](compound-types/enum.md)
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- [Flow Control todo](flow-control.md)
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# tuple
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# Tuple
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🌟 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.
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```rust,editable
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fn main() {
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let _t0: (u8,i16) = (0, -1);
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// Tuples can be tuple's members
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let _t1: (u8, (i16, u32)) = (0, (-1, 1));
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// fill the blanks to make the code work
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let t: (u8, __, i64, __, __) = (1u8, 2u16, 3i64, "hello", String::from(", world"));
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}
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```
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🌟 Members can be extracted from the tuple using indexing.
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```rust,editable
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// make it works
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fn main() {
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let t = ("i", "am", "sunface");
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assert_eq!(t.1, "sunface");
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}
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```
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🌟 Long tuples cannot be printed
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```rust,editable
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// fix the error
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fn main() {
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let too_long_tuple = (1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13);
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println!("too long tuple: {:?}", too_long_tuple);
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}
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```
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🌟 Destructuring tuple with patter.
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```rust,editable
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fn main() {
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let tup = (1, 6.4, "hello");
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// fill the blank to make the code work
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let __ = tup;
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assert_eq!(x, 1);
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assert_eq!(y, "hello");
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assert_eq!(z, 6.4);
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}
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```
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🌟🌟 Destructure assignments.
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```rust,editable
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fn main() {
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let (x, y, z);
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__ = (1, 2, 3);
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assert_eq!(x, 3);
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assert_eq!(y, 1);
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assert_eq!(z, 2);
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}
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```
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🌟🌟 Tuples can be used as function arguments and return values
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```rust,editable
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fn main() {
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// fill the blank to make it work
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let (x, y) = sum_multiply(__);
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assert_eq!(x, 5);
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assert_eq!(y, 6);
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}
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fn sum_multiply(nums: (i32, i32)) -> (i32, i32) {
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(nums.0 + nums.1, nums.0 * nums.1)
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}
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```
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@ -14,7 +14,7 @@
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- [字符串](compound-types/string.md)
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- [数组](compound-types/array.md)
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- [切片](compound-types/slice.md)
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- [元组 undo](compound-types/tuple.md)
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- [元组](compound-types/tuple.md)
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- [结构体 undo](compound-types/struct.md)
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- [枚举 undo](compound-types/enum.md)
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- [流程控制 todo](flow-control.md)
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