Go - Functions - 2
Modifications to the parameter copy don't affect the caller except pointer, slice, map, function, channel A function declaration without a body indica...
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Go - Functions - 1
Declare func name(parameter-list) return-list {...} Parameter list type can be declared only once if types are the same func test(a string, b string,...
Go - JSON
ex. var p = Person{}; json.Marshal(p) json.marshal return byte slice contains long string wuthout extraneous Ex.data, err = json.MarshalIndent...
Go - Structs - 7
Name and visibility is implicitly determined by its type Outer struct type gains not just the fields of the embedded type but its methods too
Go - Structs - 5
Comparable struct can be a key of a map. (What will happen when struct value changed?) Can declare a named struct type in another struct as field ...
Go - Structs - 4
Shorthand notation to create and initialize a struct variable Ex. pp := &Point{1,2} It’s same as pp := new(Point) *pp = Point{1,2} If all f...
Go - Structs - 3
A struct can be declared to require client need assign values to each fields with right order. Such pattern will be hard to maintain in the future...
Go - Structs - 2
A named type S CAN NOT declare a field with the same type S, but it can contains a field with type *S, for recursive data structure Zero struct field...
Go - Maps
Declared: map[KeyType]ValueType Ex. m := make(map[string]int) m["a"]=1 m{"b"]=2 Ex. m := map[string]int { "a":1, "b":2,...
Go - Slices
Slices contains many example images, causes I can’t save in Blogger in one article. So I split to 3 parts. Go - Slices (1/3) Go - Slices (2/3) Go - Slices (...
Go - Slices - 3
Ex. Slice is in the middle of an array, what will happen in that array after append? => Array value will reflect slice change, but array instance will ...
Go - Slices - 2
Slice is NOT comparable Standard library provide a way to compare 2 byte slices Reference type such as pointers and channels, the == test whether...
Go - Slices -1
Slice is declared as "var s []T" Declare a slice by make([]int,length,capacity) Slice looks like an array without size Pointer: point to the first eleme...
Scan Cassandra-2.0.17 log to check write data loading
We use Cassandra 2.0.17. Sometimes we suffer IO problem in system, we can use "iotop" to know process IO loading. But sometimes we need more detail, such a...
Go - Arrays
Declare an array Ex. var a [3]int a[0] len(a) for idx, v range a {} for _, v range a ,{} Declare with specified values. Default value is ...
Go - const
Just some ways to declare const
Go - Boolean and Strings
Boolean bool boolean Strings Conventionally UTF-8 Built-in function len returns the number of bytes, not runes in a string Detect length of s...