Go - pipelines
Ex. Make 3 channels and chan together, print in fmt.Println(<-channel) There is no way to check is a channel closed Close pipeline safely. Check rece...
Recent Posts
Go - unbuffered channel
Unbuffered channel causes sender and receiver synchronized, called synchronized channel "When a value is sent on an unbuffered channel, the receipt of ...
Go - channel - basic
Declare ch := make(chan int) // unbuffered, send will be blocked until receive was called ch := make(chan int, 0) // unbuffered, send will be b...
Go - goroutine
Run f() in another goroutine: go f() To produce a race condition issue, can make for loop larger
Go - Type Switch
switch x.(type) { case: 。。 default:..} No fallthrough is allowed Reuse assert type result. switch x := x.(type) {...} Can combine more than one t...
Go - Type Assertion
X.(T) X is interface, T is concrete type. When T is a concrete type, it assert dynamic type of X is identical to T. Result is the dynamic value wi...
Go - Interface value
Real type of an interface variable is decided dynamatically Need be careful when comparing interface, panic will occur when real type is not comparable ...
Go - Interface Satisfaction - 2
When a type value assign to a variable, it can call method declared with type value and pointer When a type pointer assign to a variable, it can call...
Go - Interface Satisfaction - 1
A function declared with type (not a pointer), can call method by type value. Can use (&t) to call method by address as well When a function d...
Go - Interface Embedding
Declare embedding interface No problem if two interfaces have same method
Go - Interface Contracts
Don't need implement interface, only method is enough Compile error if signature is wrong, Although don't need declare "implements", but sti...
Go - encapsulation
Access control: upper case ecported to diiferent package It means the unit of encapsulation is package Difference Ex. type A int, can’t be encapsul...
Go - Method Values
Can assign method to a variable Ex. M = s.methodname; M() Can define func signature and assign implementation later Status will follow methods ...
Convert CQL query result file hex to ascii
<div> Under Cassandra-2.0.17, I want to query a table by cqlsh</div> First of all, I put query in a file: ~/query.cql select * from "myData"...
Go - Methods - Pointer Receiver
Declare Method Method and Function can be the same name Method and Field can not have the same name Can declare another method name in the sa...
Go - Functions - 6 (panic, recover, stackTrace)
During panic, normal execution stop, defered function in goroutine executed and the program crash with log message Ex. Declare a panic. A pan...
Go - Functions - 5 (variadic function, defer)
Declare variadic function Variadic function parameter type is .... Different from slice. Action can be defered with a defer statement. Defered fun...
Go - Functions - 4
Must declare a func before let func call itself recursively. Otherwise compile error Loop will reuse variable address, so a new variable must be dec...
Go - Functions - 3
Can declare function without name. Called anonymous function. How client know it needs return value? => Because function signature has conc...