Swift ざっくり文法 (1)

• statement

  • 区切りは、; か改行
  • ; 付けないことが一般的

• print

print("blue", "green", separator: "+", terminator: ",")
print("yellow", terminator: ",")
print("red")
// blue+green,yellow,red

print(#file) // MyPlayground.playground
print(#line) // 16
print(#column) // 7
print(#function) // __lldb_expr_57

• constant, variable

  ---	---
  constant	let
  variable	var

  • {} で区切られている範囲がconstant, variableのスコープ
    • class
    • method
    • if statement

let name: String
name = "タナカ"

let name: String = "タナカ"

let name = "タナカ"

• 演算子の、前後に空白を入れるか/詰めるかしないとError

price = 2500 * rate // ok
price = 2500*rate // ok
price = 2500* rate // error: consecutive statements on a line must be separated by ';'

• 型判定

let tax = 0.08
print(type(of:tax)) // Double

• 型変換

let num: Int = 4 // 4
Double(num) // 4.0

• 文字列中の変数展開

let hoge = 32
print("hoge: \(hoge)")

Reference from

https://www.amazon.co.jp/dp/4800711843