Categories
Category: Uncategorized
package main
import "fmt"
func helloGo() {
fmt.Println("Hello Go from a Function")
}
func main() {
helloGo()
func() { fmt.Println("Hello Go from an Anonymous Function") }()
var hello func() = func() { fmt.Println("Hello Go from an Anonymous Function Variable") }
hello()
}
Categories
Using Map with Examples
Read Me First
Refer to the Go Language Specification documentation for map type. A copy of the map type specification posted on this website.
MapType = "map" "[" KeyType "]" ElementType . KeyType = Type .
Type = TypeName | TypeLit | "(" Type ")"
Map build-in function
len()
Syntax : keyword [ key type ] element type
Keyword : map
[key type] can be all Go type EXCEPT map, slice and function
s := make([]string,0)
Invalid key type map[s]string, s is a slice of string type.
Element type can be byte, int, float64, string, struct
var m map[int]int
m := map[int]int
m := map[int]string
m := map[string]int
m := map[string]string
Map of struct type
type name struct {
firstName string
lastName string
age int
}Note: the key type must NOT be function, map or slice
m := map[string]name
Initialize a map using the make function, value of nil assigned
myMap := make(map[int]string)
initialize the map with some values
myMap = map[int]string{1: “first”, 2: “Second”, 3: “third”}
Add elements into the map
m := map[string]float64{
"pi" : 3.14,
"ftom" : 0.3,
}Map literal add two(2) element added to m. Note the operator “:=” and {} backets end of
m := map[string]string
m["first"] = "first name"To obtain a value from a map
//x will hold the value in “myMap” that corresponds to key 3
var x = myMap[3]
Check if a key exists in a map
//If the key 5 is not in “myMap”, then “ok” will be false
//Otherwise, “ok” will be true, and “x” will be the value
x,ok := myMap[5]
Type = TypeName | TypeLit | "(" Type ")"
Categories
No Login Here
The site does NOT allow for comments and the creation of a new user account. You have been informed of these rules of restrictions.
Stop doing the login activities here it is an act of HACKING violation. You have been warned.
Categories
TinyGO (Windows platform)
A Go compiler for microcontrollers (such as Espressif (ESP8266/ESP32), Arduino (Arduino Uno -Atmega), BBC microbit ARM Cortex-M0 )
Windows 10 Setup
Categories
Go Environment – GOPATH
$GOPATH specifies the top-level directory containing source code for all our Go projects, this directory is known as Go Workspace
The default value of $GOPATH /home/username/go in Linux Distribution platform. On Windows platform is /user/username/go.
On the /home/username/go folder our Go workspace sub-folders must have the following which our task it create three (3) new sub-folders {src,bin,pkg}.
- /home/username/go/src
- /home/username/go/bin
- /home/username/go/pkg
Our project folder will be sub-folder of /home/username/src, let say to print a hello world message. Create a new sub-folder “helloworld folder” under src folder. Inside the sub-folder helloworld, create a go source file “helloworld.go”.