constantly

(constantly x)

返回一个匿名函数， 接受任何数量的参数， 但总是返回 x 。

user=> (def ten (constantly 10))
#'user/ten

user=> (ten)
10

user=> (ten 1)
10

user=> (ten 1 2)
10

user=> (ten 1 2 3)
10

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