Elixir: array to function arguments

Question

I'm new to Elixir. I use the redix library to work with Redis. I can't manage to execute MGET command properly. This code works:

Like4uElixir.RedixPool.command(["MGET", "a", "b", "c"])

- it returns 3 values from Redis. But this code doesn't work:

keys = ["a", "b", "c"]
Like4uElixir.RedixPool.command(["MGET", keys])

But I have all the keys in array. How can I convert my array to a number of function arguments?

If @Gazler answered your question, you should accept his answer as the right one. — Onorio Catenacci
– Onorio Catenacci, Commented Jan 26, 2016 at 15:59

Gazler · Accepted Answer · 2016-01-27 08:36:58Z

7

You're code samples aren't the same. You are creating a nested list instead of creating a single list with 4 elements.

You're second example does:

["MGET", ["a", "b", "c"]]

You want to do:

keys = ["a", "b", "c"]
Like4uElixir.RedixPool.command(["MGET" | keys])
#or Like4uElixir.RedixPool.command(["MGET"] ++ keys)

answered Jan 26, 2016 at 14:45

Gazler

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4 Comments

OMG, so easy! :) it was my typo, thank you. I thougth(don't know why) it was function arguments, not a list.

Slightly more idiomatic maybe ["MGET" | keys]. Also s/you're/your/ ;-)

@cdegroot Thanks for the suggestions.

The use of the cons operator is more idiomatic. However, if you already had a list of arguments, you could use Kernel.apply. Just an FYI.