打卡，已经学完了 A Tour of Go 的：
1. Packages, variables, and functions.
2. Flow control statements: for, if, else, switch and defer
3. More types: structs, slices, and maps.
4. Methods and interfaces
还差最后一个：
5. Concurrency
️ 
tour.golang.org
1. Packages, variables, and functions.
2. Flow control statements: for, if, else, switch and defer
3. More types: structs, slices, and maps.
4. Methods and interfaces
还差最后一个：
5. Concurrency
️ 
tour.golang.org
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