Papillon6814
In Elixir, if executes a do…end block unless the given condition is false or nil as you know.
iex(1)> if true, do: IO.puts("ok")
ok
:ok
iex(2)> if 3, do: IO.puts("ok")
ok
:ok
iex(3)> if false, do: IO.puts("ok")
nil
iex(4)> if nil, do: IO.puts("ok")
nil
iex(5)> if "ok", do: IO.puts("ok")
ok
:ok
I’d like to know how to check whether the given argument for if is true. The only way I thought out for checking it is below.
if a == true, do: IO.puts("ok")
I feel a == true is somehow weird, are there any better ways to check true?
Where Next?
Trending in Questions
Other Trending Topics
Latest on Elixir Forum
Sponsor Spotlight
Elixir, Erlang & messaging conferences from Code Sync. Next up: ElixirConf US (10–11 Sep) & Code BEAM Europe (21–22 Oct), Haarlem + online.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #library
- #deployment
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #elixirconf
- #channels
- #exunit
- #discussion
- #code-sync
- #podcasts
- #javascript
- #onsite
- #dialyzer
- #docker
- #authentication
- #ai
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #blog-post
- #elixirconf-us
- #elixir-ls
- #phoenix_html
- #iex
- #graphql
- #genstage
- #websockets
- #supervisor
- #advent-of-code
- #distillery
- #processes
- #elixirconf-eu
- #api
- #forms
- #security
- #performance
Our Sponsors
Supporting innovation across the BEAM ecosystem.
We build reliable cloud platforms for business-critical systems.
Catch errors, track performance, monitor hosts and more.
Error tracking, logs, uptime, and Just Enough APM. Built for developers.
Elixir, Erlang & BEAM conferences from Code Sync - join us in 2026!
Bringing learning, work and compliance together since 1987.
Producing high quality Elixir screencasts since 2017.
The deployment platform built for Elixir: PaaS ease, VPS control.
The team behind Membrane, Popcorn, LiveDebugger. Available for hire.
Courses that'll move you from confusion to "Aha, now I get it!"
Marked As Solved- Show Best Posts
- Show All (oldest first)
- Show All (newest first)
kip
In Elixir, with the exception of guards, the principle is of
truthyness meaning that for boolean comparisons,nilandfalseare considered false and everything else is true.Meaning if you truly want to check for the atom
trueyou will need to doa == trueas you are doing. The valuestrue,falseandnilare just atoms in Elixir, nothing more.Also Liked
Papillon6814
Thank you. I will do
a == truein Elixir!