列表從INT到特定字符串

Question

我會怎麼做，如果我想轉的Int秒的列表，如[1,2,3]到["∧","∨","→"]（所以如果有一個「1」，把它變成了「∧」等）

Answer 1

我可能會做的兩個步驟：

conv :: Int -> String 
conv 1 = "∧" 
conv 2 = "∨" 
conv 3 = "→" 

然後就是映射是：

change :: [Int] -> [String] 
change = map conv 

change [1,2,3] -- returns ["∧","∨","→"] 

你甚至可以嵌入：

change = map conv 
    where 
    conv 1 = "∧" 
    ...