Number to string with leading (left padded) zeros in Julialang

For Julia 1.0 the syntax is:

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

The example is therefore:

julia> lpad(4, 3, '0')
004

You're looking for the lpad() (for left pad) function:

julia> lpad(4,3,"0")
"004"

Note the last argument must be a string.

From the documentation:

lpad(string, n, "p")

Make a string at least n columns wide when printed, by padding on the left with copies of p.