Variables and Constants

๋ณ€์ˆ˜/์ƒ์ˆ˜์˜ ์„ ์–ธ๊ณผ ์ดˆ๊ธฐํ™”

Before getting started

Constants

  • ๋ณ€์ˆ˜์ง€๋งŒ ๊ฐ’์„ ๋ฐ”๊ฟ€ ์ˆ˜ ์—†๋Š” ๊ฒƒ

    • Javascript์—์„œ๋Š” const!

Untype constant

  • ํƒ€์ž…์ด ์—†๋Š” ์ƒ์ˆ˜

    • ex)

      package main
      
      func main() {
       const name = "chloe"
      }

Type constant

  • ํƒ€์ž…์ด ์žˆ๋Š” ์ƒ์ˆ˜

    • ex)

      package main
      
      func main() {
        const name string = "chloe"
      }
  • ๋‹น์—ฐํ•˜์ง€๋งŒ ์ƒ์ˆ˜์ด๋ฏ€๋กœ ๊ฐ’์„ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์—†๋‹ค!

    • ex)

      package main
      
      func main() {
        const name string = "chloe"
        name = "camila" // -> ๋ถˆ๊ฐ€
      }

Variables

  • ๋ง ๊ทธ๋Œ€๋กœ ๋ณ€์ˆ˜ (๊ฐ’์„ ๋ณ€๊ฒฝํ•  ์ˆ˜ ์žˆ๋‹ค)

    • Javascript์—์„œ๋Š” let!

Untype variable

  • ํƒ€์ž…์ด ์—†๋Š” ๋ณ€์ˆ˜

    • ex)

      package main
      
      import "fmt"
      
      func main() {
      
       var year = 2020
       fmt.Println(year)
      
      }

Type variable

  • ํƒ€์ž…์ด ์žˆ๋Š” ๋ณ€์ˆ˜

    • ex)

      package main
      
      import "fmt"
      
      func main() {
      
       var month int = 12
       // -> month := 12 (same)
      
       fmt.Println(month)
      }

Types in Go

  • Go๋Š” ์ž‘์„ฑํ•œ ๊ฐ’์˜ type์„ ์•Œ์•„๋‚ด๋ ค๊ณ  ํ•œ๋‹ค

    • Go๋Š” type langague ์ด๊ธฐ ๋•Œ๋ฌธ!

      • "Type์ด ๋ฌด์—‡์ด๋‹ค!" ๋ผ๋Š” ๊ฒƒ์„ ์•Œ๋ ค์ฃผ์–ด์•ผ ํ•จ

        • Java๋‚˜ typescript ์ฒ˜๋Ÿผ ํƒ€์ž…์„ ์•Œ๋ ค์ค˜์•ผํ•จ

1. ๋ณ€์ˆ˜ ์„ ์–ธํ•˜๊ธฐ

1-1. Go์—์„œ์˜ ๋ณ€์ˆ˜ ์„ ์–ธ ๋ฐฉ์‹

var ๋ณ€์ˆ˜์ด๋ฆ„ ๋ณ€์ˆ˜ํ˜•

  • ๋ณ€์ˆ˜๋ฅผ ์„ ์–ธํ•œ ๊ณณ์—์„œ ๋ฐ”๋กœ ์ดˆ๊ธฐ๊ฐ’์„ ์„ค์ •ํ•  ์ˆ˜ ์žˆ์Œ

    ex)

    package main
    
    func main() {
      var num1 int = 1000
      var num2 int = 1413
    
      println("๋ง์…ˆ์„ ํ•ด๋ณด์•„์š” ~ ", num1 + num2)
    }

1-2. :=

  • Short Assignment Statement ๋ผ๊ณ  ๋ถˆ๋ฆผ

  • type ์„ ์–ธ ์—†์ด ๋ณ€์ˆ˜ ์„ ์–ธ ๊ฐ€๋Šฅ

    • Go๊ฐ€ type์„ ์ฐพ์•„์ค€๋‹ค!

      • ์ด๋ ‡๊ฒŒ shorthand ์‚ฌ์šฉํ•˜๋ฉด python์ฒ˜๋Ÿผ ์œ ์—ฐํ•˜๊ฒŒ ์‚ฌ์šฉ ๊ฐ€๋Šฅํ• ๋“ฏ!

  • ํ•จ์ˆ˜ ์•ˆ์—์„œ๋งŒ ์‚ฌ์šฉ ๊ฐ€๋Šฅ!!

    ex)

    package main
    
    func main() {
     var a int = 100
     var b string = "Haha"
     c := 200
     print(b, a+c);
    }

+

Go๋Š” ๋ณ€์ˆ˜๋ฅผ ๋งŒ๋“ค๊ณ  ์‚ฌ์šฉํ•˜์ง€ ์•Š์œผ๋ฉด ์—๋Ÿฌ๋ฅผ ๋ฐœ์ƒ์‹œํ‚ค๋ฏ€๋กœ ์œ ์˜ํ•˜์ž!

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