Haskell：使用 lambda 表达式的匿名函数列表

Question

我对 Haskell 很陌生，我想使用 lambda 表达式定义一个匿名函数列表， 代表四种基本算术运算。

this is what i have done bao = (\ x y -> x+y)
 but i want to apply 3 more expressions(\x y ->x-y)
                                       (\x y ->x*y)
                                       (\x y ->x/y) 
as well by putting bao before them just like what i have done to operation (+) ,and it shows error : multi declaration of 'bao' ,what  can i do ?

Thank you in advance!
                          

Answer 1

你必须定义一个列表。

bao = [\x y -> x + y, \x y -> x - y , \x y -> x * y, \x y -> x / y]

更简单的定义为

bao = [(+), (-), (*), (/)]