JavaScript, as a dynamically-typed language, provides two distinct primitive values to represent the absence of a meaningful value: undefined and null. Although they might seem similar at first glance, they have different meanings and behaviors. Understanding the difference between undefined and null is crucial for writing clean and bug-free JavaScript
Ruby, a dynamic, object-oriented programming language, offers several methods for outputting information to the console. Among the commonly used ones are puts, print, and p. While they might seem similar at first glance, each serves a distinct purpose in Ruby programming. Let’s delve into each of these methods to understand
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By being a part of the talent pool, you will have access to top-tier job opportunities from the world’s leading companies and startups. Our team works tirelessly to connect you with the best possible opportunities, giving you the chance to work on exciting projects and develop your skills even further.
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Here are some Go programming fundamentals with code examples:
In Go, variables can be declared using the var keyword. The type of the variable is also specified.
Here's an example:
var x int = 5var y float64 = 5.5
In Go, functions are declared using the func keyword.
Here's an example:
func add(x int, y int) int {
return x + y
}
func main() {
result := add(2, 3)
fmt.Println(result)
}
Go supports various control structures such as if-else statements and for loops.
Here's an example:
func main() {
age := 18if age >= 18 {
fmt.Println("You can vote!")
} else {
fmt.Println("You can't vote yet.")
}
for i := 0; i < 5; i++ {
fmt.Println(i)
}
}
Go supports arrays and slices.
Here's an example:
func main() {
// Declaring an arrayvar a [5]int
a[0] = 1
a[1] = 2
a[2] = 3
a[3] = 4
a[4] = 5// Declaring a slice
b := []int{1, 2, 3, 4, 5}
fmt.Println(a)
fmt.Println(b)
}
Go supports structs, which are collections of fields.
Here's an example:
type person struct {
name string
age int
}
func main() {
p := person{name: "Alice", age: 30}
fmt.Println(p.name)
}
These are just some basic Go programming fundamentals. There are many more concepts and features to learn, such as interfaces, concurrency, and error handling.
Here is an example of a simple web application in GoLang which retrieves articles from an external API and allows users to create and update existing articles.
package main
import (
"encoding/json""fmt""html/template""net/http""strconv"
)
type Article struct {
ID int `json:"id"`
Title string `json:"title"`
Content string `json:"content"`
}
var articles []Article
func homePage(w http.ResponseWriter, r *http.Request) {
fmt.Fprintf(w, "Welcome to the home page!")
}
func viewArticle(w http.ResponseWriter, r *http.Request) {
id, err := strconv.Atoi(r.URL.Query().Get("id"))
if err != nil || id < 1 || id > len(articles) {
http.NotFound(w, r)
return
}
article := articles[id-1]
tpl := template.Must(template.ParseFiles("article.html"))
tpl.Execute(w, article)
}
func createArticle(w http.ResponseWriter, r *http.Request) {
if r.Method == "GET" {
tpl := template.Must(template.ParseFiles("create.html"))
tpl.Execute(w, nil)
} else {
title := r.FormValue("title")
content := r.FormValue("content")
articles = append(articles, Article{ID: len(articles) + 1, Title: title, Content: content})
http.Redirect(w, r, "/", http.StatusSeeOther)
}
}
func updateArticle(w http.ResponseWriter, r *http.Request) {
id, err := strconv.Atoi(r.URL.Query().Get("id"))
if err != nil || id < 1 || id > len(articles) {
http.NotFound(w, r)
return
}
article := &articles[id-1]
if r.Method == "GET" {
tpl := template.Must(template.ParseFiles("update.html"))
tpl.Execute(w, article)
} else {
title := r.FormValue("title")
content := r.FormValue("content")
article.Title = title
article.Content = content
http.Redirect(w, r, "/", http.StatusSeeOther)
}
}
func main() {
// Retrieve articles from external API
response, err := http.Get("https://jsonplaceholder.typicode.com/posts")
if err != nil {
panic(err)
}
defer response.Body.Close()
err = json.NewDecoder(response.Body).Decode(&articles)
if err != nil {
panic(err)
}
// Define routes
http.HandleFunc("/", homePage)
http.HandleFunc("/article", viewArticle)
http.HandleFunc("/create", createArticle)
http.HandleFunc("/update", updateArticle)
// Start server
fmt.Println("Server started on http://localhost:8080")
http.ListenAndServe(":8080", nil)
}
/: Displays a welcome message and a list of all articles/article?id=X: Displays a specific article with ID X/create: Displays a form for creating a new article/update?id=X: Displays a form for updating an existing article with ID Xarticle.html, create.html, and update.html. Note that this example uses the net/http package and the html/template package to handle HTTP requests and generate HTML output.