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Julia的lpad函数的奇异行为与字符串插值

julia

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Julia Learner anothershrubery · 技术社区 · 7 年前

下面的代码让我吃惊:

julia> for person in 1:12
           println("person is $(lpad(2, person))")
       end
person is 2
person is  2
person is   2
person is    2
person is     2
person is      2
person is       2
person is        2
person is         2
person is          2
person is           2
person is            2

直到我意识到我已经把论点加入了辩论中,它才显得完全神秘 lpad

julia> for person in 1:12
           println("person is $(lpad(person, 2))")
        end
person is  1
person is  2
person is  3
person is  4
person is  5
person is  6
person is  7
person is  8
person is  9
person is 10
person is 11
person is 12

不过,肯定有什么事情我不知道 lpad公司

lpad公司 docs :

lpad(s, n::Integer, p::Union{AbstractChar,AbstractString}=' ') -> String

关于发生了什么有什么建议吗?

1 回复 | 直到 7 年前

1

Bill Antonello 7 年前

在函数docs中,第二个参数确定打印的第一个参数:

lpad(s, n::Integer, p::Union{AbstractChar,AbstractString}=' ') -> String

Stringify s and pad the resulting string on the left with p to make
it n characters (code points) long. If s is already n characters long,
an equal string is returned. Pad with spaces by default.

所以循环计数器是person,这也是空格数