Go Tutorial Part 2 - Variables

1 Simple Variable Definition and initilization

package main

import "fmt"

func main() {
	var card string = "Ace of Spades"
	fmt.Println(card)
}

1. var: used to create anew ariable
2. card: the name of the variable
3. string: type of the variable
4. “Ace of Spades”: value of the variable

2 Supported Data Types:

1. bool: true, false
2. string “Hi”, Hello"
3. int: 0, -1000, 900
4. float64: 10.00001, 0.0009, -1.111
5. and many more…

3 Alternative Type Definition

package main

import "fmt"

func main() {
	card := "Ace of Spades"
	card = "Five of Diamonds"
	fmt.Println(card)
}

No need to define type, it is inferred if “:=” is used

4 Initialize then Assign

    package main
     
    import "fmt"
     
    func main() {
      var deckSize int
      deckSize = 52
      fmt.Println(deckSize)
    }

5 We can initialize a variable outside of a function, we just can’t assign a value to it.

    package main
     
    import "fmt"
     
    var deckSize int
     
    func main() {
      deckSize = 50
      fmt.Println(deckSize)
    }

6 Each Variable declared must always be used

Type conversion

greeting := "Hi There"
fmt.Println([]bytr(greetin))