Hi Experts, I am looking for built in function something like String builder with Placeholders. Iet say in C like languages usuall you wold have function that looks like: print(" Some string %placeholder1, string continues…%placeholder2 ", var1, var2) #vars goes to placeholders `Do we have so…

Maybe not the simplest option but also works iex(1)> template = "http://somesite.com/?i=#<%=id%>&lang=#<%=language%>&type=api&api_v=1&api_type=#<%=data_type%>" "http://somesite.com/?i=#<%=id%>&lang=#<%=language%>&type=api&api_v=1&api_type=#<%=data_type%>" iex(2)> EEx.eval_string(template, [id: 1, l…

Do You mean string interpolation? Because it does… iex> id = 223344 223344 iex> lang = "eng" "eng" iex> type = "json" "json" iex> url = "http: // somesite. com/?i=#{id}&lang=#{lang}&type=api&api_v=1&api_type=#{type}" "http: // somesite. com/?i=223344&lang=eng&type=api&api_v=1&api_type=json" Now i…

[image] kokolegorille: Do You mean string interpolation? Almost…it works in iex, but no in code… this is that I mean: def prit_url(id, lang, url) do IO.puts url do How this function should look like, so user’s ID and LANG would go to URL ?

[image] cpgo: Maybe not the simplest option but also works Hm… yeap, looks like a temporary solutionm but I wonder, maybe there is something nicer ? :smiley:

If You can have an url like this… iex> url = "http://somesite.com/?i=%{id}&lang=%{language}&type=api&api_v=1&api_type=%{data_type}" I just changed # for % to have a valid string… Then You could iex> url |> String.split("%") ["ht…

[image] kokolegorille: But it is a little bit hackish… Yep… Well, I know that I can parse url… The point is that this solution is not flexible… This would work good on static urls, that do not change… In cases where url can be any, probably it is better to use cpgo’s solution. In my case…

Thank you guys for help ! :slight_smile:

You should generally be using the URI module to deal with URLs: URI — Elixir v1.20.2 That will handle the escaping, otherwise you will have plenty of surprises with strange data.

One way is with Michał Muskała’s Format library GitHub - michalmuskala/format: A simple string formatter for Elixir · GitHub . I’m not sure if there’s any documentation, but you can do: def print_url(id, language, url) do url |> Format.compile() |> Format.string(id: id, language: language) |>…

[image] jakemorrison: You should generally be using the URI module to deal with URLs Hi jakemorrison, Thank you for a good point. :+1: You are absolutely right.

[image] jfeng: One way is with Michał Muskała’s Format library Hi jfeng, Thank you for advice :+1 , but I probably had to mentioned that I would prefer not to add extra dependencies. Meanwhile, I can have a look, into their code and analyse it to get more ideas.