Go programming language
[Pages:32]Go programming language
? history ? basic constructs ? simple programs ? arrays & slices ? maps ? methods, interfaces ? concurrency, goroutines
Go source materials
? official web site:
? Go tutorial, playground
? Rob Pike on why it is the way it is:
? Russ Cox on interfaces, reflection, concurrency
Hello world in Go
package main! import "fmt"! func main() {!
fmt.Println("Hello, ")! }!
$ go run hello.go # to compile and run! $ go build hello.go # to create a binary!
$ go help
# for more!
Types, constants, variables
? basic types
bool string int8 int16 int32 int64 uint8 ... int uint! float32 float64 complex64 complex128! quotes: `', "UTF-8 string", `raw string`!
? variables
var x, y, z = 0, 1.23, false // variable decls! x := 0; y := 1.23; z := false // short variable decl!
Go infers the type from the initializer ? assignment between items of different type requires an explicit
conversion, e.g., int(float_expression)
? operators
? mostly like C, but ++ and -- are postfix only and not expressions ? assignment is not an expression
Echo command:
// Echo prints its command-line arguments.! package main!
import (! !"fmt"! !"os"! )!
func main() {! var s, sep string! for i := 1; i < len(os.Args); i++ {!
! !s += sep + os.Args[i]! ! !sep = " "!
}! fmt.Println(s)! }!
Echo command (version 2):
// Echo prints its command-line arguments.! package main!
import (! !"fmt"! !"os"! )!
func main() {! s, sep := "", ""! for _, arg := range os.Args[1:] {!
! !s += sep + arg! ! !sep = " "!
}! fmt.Println(s)! }!
Statements, control flow: if-else
? statements
? assignment, control flow, function call, ... ? scope indicated by mandatory braces; no ; terminator needed
? control flow: if-else, for, switch, ...
if opt-stmt; boolean {
!
statements!
} else if opt-stmt; boolean {!
statements!
} else {!
statements!
}!
if c := f.ReadByte(); c != EOF { // scope of c is if-else! ...!
}!
Control flow: for
for opt-stmt; boolean; opt-stmt {! statements // break, continue (with optional labels)
}!
for boolean {! // while statement!
}!
for {! // infinite loop!
}!
for index, value := range something {! // ...!
}!
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