Spec

function

1. Multiple values can be returned

defer

1. defer works first-in-last-out

slice

1. make is used to have the size of variable. make([]int, size)
2. To implement like foreach, for index, element := range slice can be used

map

1. Declaration: m := map[string]int{}

method

1. The receiver can be pointer or value. All methods should have the either pointer or value for a type.
2. interfaces can be implemented implicitly.
3. A receiver can be nil in a method
4. The empty inteface interface{} can be used for unknown type.
5. Type assertion var.(T). See type-switches.go

Standard interface

1. Stringers to println in fmt.

type Stringer interface {
    String() string
}

2. Error interface, used such as fmt

type error interface {
    Error() string
}

Go routine

1. By make(chan int, bufferSize int), channels can be created.
2. Receive values by channel <- v
3. The values can be received by loop for i := range channel
4. close should be closed by a sender
5. select is wait on multiple operations. See select.go for more details Note that if default case is presented, select does not wait but run in a default
6. sync.Mutex and Lock/Unlock is used when no communication is required