Sha256: 7330f01532a886da7a3776ff7072227fe84f3eda475b1881bc038c5264f46fce
Contents?: true
Size: 596 Bytes
Versions: 72
Compression:
Stored size: 596 Bytes
Contents
macro isbn_str(s)
ISBN(s)
end
struct ISBN <: AbstractString
s::AbstractString
ISBN(s) = verify(s) ? new(replace(s, "-", "")) : throw(ArgumentError("invalid ISBN string: $s"))
end
string(s::ISBN) = s.s
function verify(s::AbstractString)
s = replace(s, "-", "")
chars = split(s, "")
length(chars) == 10 || return false
if last(chars) == "X"
chars[end] = "10"
end
all(c -> all(isdigit, c), chars) || return false
sum(parse(Int, c) * i for (c, i) in zip(chars, 10:-1:1)) % 11 == 0
end
Base.isvalid(::Type{ISBN}, s::AbstractString) = verify(s)
Version data entries
72 entries across 72 versions & 1 rubygems