Go structs, slices, maps

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"Go structs, slices, maps"

1, when defined * After the variable name, when used * in front of the variable name.

　　

　　

2, the definition struct,type before, the struct keyword after.

　　

3. The pointer can specify a struct.

　　

4, a struct literal denotes a newly allocated struct value by listing the values of their fields.

You can list just a subset of fields by using the Name: syntax. (and the order of named fields is irrelevant.)

　　

5, the array definition.

　　

6, A slice points to an array of values and also includes A length.

　　[]Tis a slice with elements of type T .

　　

7. Slices can re-sliced, creating a new slice value that points to the same array.

[A, b] takes a value interval of a->b-1.

　　

8, Making slices

　　

　　

9. The zero value of a slice is nil .

A nil slice has a length and capacity of 0.

　　

For the above formula, Z is nil.

10. Add elements through the Append method.

　　

11. Range can be used to iterate slices in for.

　　

12, through _ can omit the index.

　　

13. Maps must is created with make (not new ) before use

　　

14, Map literals is like a struct literals, but the keys is required.

　　

15, can omit vertex. If the top-level type is just a type name, you can omit it from the elements of the literal.

　　

16. Operation of Map

　　

17, the function is also a variable.

　　

18, closure.

　　

Reference: HTTPS://TOUR.GOLANG.ORG/MORETYPES/1