printing numbers with the width of the length of a specific string in Julia

Question

In Julia, when I want to print a number "4" with the width of 10, I do:

@printf("%10d", 4)

If I want to set the width as the length of a specific string, for example:

mystr = "Hello World"

how to change 10 in "%10d" to length(mystr)?

Answer 1

Checkout the Formatting library:

using Formatting
printfmt("{:$(length("Hello World"))d}", 4)