Kian Wallace

Kian Wallace

1569852400

Moving from JavaScript to Golang

Variables

Javascript

In Javascript variables can be declared using the let, const(ES6), and var(ES5) keyword.

  // using the const keyword
  const a = 10
  // using the let keyword
  let b = 10
  // using the var keyword
  var c = 10
  console.log(a, b, c) // returns 10, 10, 10

Golang

In Go variables can be declared using the var, const keyword and also using the short syntax.

  // using the var keyword
  var a = 10 // go detects the type here even though we don't specify
  fmt.Println(a) // returns 10
  fmt.Printf("variable a is of type: %T\n", a) // returns int

  // using the const keyword
  const b = 20  // It is important to note that the value of b must be known at compile-time
  fmt.Println(b) // returns 20

  // a variable can be initialized with the var keyword
  var c bool
  fmt.Println(c) // returns the zero value(zero value of a boolean is false)

  // using the short syntax
  d := "this is a variable" // go detects the type of this variable
  fmt.Println(d) // returns this is a variable
  fmt.Printf("d is of type: %T\n", d) // returns the type(string)

Variable Playground

Arrays

An array is a collection of items.

Javascript

In Javascript arrays are dynamic, items can be added and removed from the array, also Javascript being a loosely-typed language, it can hold values of different type in the array.

  let myArray = [1, "this is array", true, 100.30]
  console.log(myArray) // returns [1, "this is array", true, 100.30]

// we can remove the last item in an array using the pop method
  myArray.pop()
  console.log(myArray) // returns [1, "this is array", true]

// we can add to the end of the array using push method
  myArray.push(20)
  console.log(myArray) // returns [1, "this is array", true, 20]

// we can remove the first item of the array using the shift method
  myArray.shift()
  console.log(myArray) // returns ["this is array", true, 20]

// we can add to the start of the array using the unshift method
  myArray.unshift(210)
  console.log(myArray) // returns [210, "this is array", true, 20]

Golang

Arrays are of fixed length in Go, you can’t add nor remove from an array, also an array can only contain the specified type.

    a := [5]string{"a", "b", "c", "d", "e"} // length is 5
    fmt.Println(a) // returns [a b c d e]
    // But what happens if we don't specify exactly 5 items
    b := [5]string{"a", "b", "c"}
    fmt.Printf("%#v", b) // returns [5]string{"a", "b", "c", "", ""}
    // "" represents the zero value(zero value of a string is "")

Array Playground
In Golang we also have slices, they are dynamic and we don’t need to specify the length, values can be added and removed from a slice.

    a := []string{"a", "b", "c"}
    fmt.Printf("%#v", a) //  returns []string{"a", "b", "c"}

    // adding to a slice, we can use the append method to add an item to a slice
    a = append(a, "d")   // append takes in the the array and the value we are adding
    fmt.Printf("%#v", a) // returns []string{"a", "b", "c", "d"}

    // removing from a slice by slicing
    a = append(a[0:3])   // 0 represents the index, while 3 represents the position
    fmt.Printf("%#v", a) // returns []string{"a", "b", "c"}

    // slices can also be created using the make method(in-built)
    // the first value is the type, the second and the third value is the length and maximum capacity of the slice
    b := make([]string, 3, 5)
    fmt.Printf("length of b is:%#v, and cap of b is:%#v\n", len(b), cap(b)) // returns length of b is:3, and cap of b is:5

Slice Playground

Function

Javascript

In Javascript a function expression can we written using the function keyword, arrow function(ES6) can also be used.

// using the function keyword
   function a(value) {
       return value
   }
   const val = a("this is the value")
   console.log(value)
// using arrow function
   const b = ((value) => value) 
   const val2 = b("this is another value")
   console.log(val2)

Golang

Using the func keyword, a function expression can be written in go.

  func a() {
   fmt.Println("this is a function")
}
  a() // returns "this is a function"
// parameters and return type can also be specified
  func b(a,b int) int { // takes in value of type int and returns an int
     result := a * b
   return result
}
  val := b(5,6)
  fmt.Println(val) // returns 30

Function Playground

Objects

Javascript

In JavaScript we can write Objects by specifying the key and the value in curly braces separated by a comma.

  const music = {
   genre: "fuji",
   title: "consolidation",
   artist: "kwam 1",
   release: 2010,
   hit: true
}
console.log(music) // returns {genre: "fuji", title: "consolidation", artist: "kwam 1", release: 2010, hit: true}

Golang

In Golang their is Structs which holds a field and the field type

  type Music struct {
    genre   string
    title   string
    artist  string
    release int
    hit     bool
}
ms := Music{
    genre:   "hiphop",
    title:   "soapy",
    artist:  "naira marley",
    release: 2019,
    hit:     true,
}
fmt.Printf("%#v\n", ms) // returns main.Music{genre:"hiphop", title:"soapy", artist:"naira marley", release:2019, hit:true}

Struct Playground

Helpful Golang resources

Tour of go
Complete go bootcamp
RunGo
gobyexample

#javascript #go

What is GEEK

Buddha Community

Moving from JavaScript to Golang
Arvel  Miller

Arvel Miller

1603439853

The Nuances of Constants in Go; Go Isn't JavaScript

Constants can be confusing and easy to misuse in Go if you are coming from an untyped language. Let’s take a look at some of the nuanced details of how they work in Go. It’s probably unsurprising, but Go’s constants are almost nothing like JavaScript’s bastardized version of the concept.

Go vs JavaScript

Many programming languages support constants, often denoted by the keyword const.

Go and JavaScript both declare new constants in the same way:

const frameRate = 60

Constants in Go

  • Must be able to be assigned at compile time. The value of a const can’t be the result of a runtime calculation.
  • Run faster because the compiler can make specific optimizations.
  • Cannot change. The compiler will not allow them to be re-assigned.
  • Only work with some types. Arrays, Slices, Maps, Structs, etc… can’t be made constant
  • Are not normal Go types unless explicitly assigned as such

#languages #clean code #engineering practices #golang #javascript #compile #const #constant #global #go #golang #javascript

Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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Niraj Kafle

1589255577

The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips

Ajay Kapoor

1626321063

JS Development Company India | JavaScript Development Services

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