Argument error when concatenting string with variables in elixir

Question

Hi I am trying the String Concatenation operation in elixir. My code is as follows:

iex(1)> name="SHubham Agiwal"
        "SHubham Agiwal"
iex(2)> age =16
         16
iex(5)> "Hello" <> name <> "World" 
         "HelloSHubham AgiwalWorld"
iex(7)> "Hello" <> name <> "World" <>age
         ** (ArgumentError) argument error

As you can see, when I try to concat it with a single variable namely name, it gives me the output as HelloSHubham AgiwalWorld. But when I try to concat it with variables name and age I get Argument error. Can somebody let me know why I am getting this error?

Why do you expect string concatenation to work with integer? — Aleksei Matiushkin
– Aleksei Matiushkin, Commented Aug 31, 2017 at 3:36
I have experience in java. So was thinking if we could concat integers to string like we do in java. Apparently we can't in elixir — shubhamagiwal92
– shubhamagiwal92, Commented Aug 31, 2017 at 3:45
@mudasobwa can you post your answer so that I can accept it? — shubhamagiwal92
– shubhamagiwal92, Commented Aug 31, 2017 at 3:46
The answer provided by @bitwalker is absolutely correct, why would I post my own? We do call the instance of string “binary” in Elixir, that is kinda Erlang’s legacy. — Aleksei Matiushkin
– Aleksei Matiushkin, Commented Aug 31, 2017 at 3:51
@shubhamagiwal92 I confess I'm not long on Java knowledge but don't you have to cast an integer to string before you concatenate it--even in Java? — Onorio Catenacci
– Onorio Catenacci, Commented Aug 31, 2017 at 12:53

bitwalker · Accepted Answer · 2017-08-31 02:18:14Z

3

The problem is that age is not a binary. You can use interpolation instead for this, like "#{age}".

answered Aug 31, 2017 at 2:18

bitwalker

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2 Comments

Aleksei Matiushkin Over a year ago

...or to_string(age), or Integer.to_string(age).

shubhamagiwal92 Over a year ago

@bitwalker You were right. The age is not binary. It is due to this that it is giving me a compile time error. using to_string solves the problem.

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