borybar
Why do I get variable is unused when using it in case do?
Hi,
I am trying to apply different calculations depending on gender using ‘case do’ however I get variable "user_bmr" is unused. What am I not understanding?
def show(conn, %{"id" => id}, current_user) do
bmr = Cpm.get_user_bmr!(current_user, id)
case bmr.sex do
"Female" -> user_bmr = (9.99 * bmr.weight + 6.25 * bmr.height - 4.92 * bmr.age) - 161
"Male" -> user_bmr = (9.99 * bmr.weight + 6.25 * bmr.height - 4.92 * bmr.age) + 5
end
render(conn, "show.html", bmr: bmr, user_bmr: user_bmr)
end
Marked As Solved
unsek
case is an expression that “returns” the last line evaluated. You don’t have to put the user_bmr variable in case, since, if I’m not mistaken, it only exists in the scope of case. Instead you can do it this way:
user_bmr =
case bmr.sex do
"Female" -> (9.99 * bmr.weight + 6.25 * bmr.height - 4.92 * bmr.age) - 161
"Male" -> (9.99 * bmr.weight + 6.25 * bmr.height - 4.92 * bmr.age) + 5
end
render(conn, "show.html", bmr: bmr, user_bmr: user_bmr)
Last Post!
borybar
Popular in Questions
Other popular topics
Latest Phoenix Threads
Latest on Elixir Forum
Sponsor Spotlight
Producing high quality Elixir screencasts since 2017.
Categories:
Sub Categories:
Forums
Popular Tags
- #ecto
- #liveview
- #troubleshooting
- #learning-elixir
- #deployment
- #library
- #erlang
- #testing
- #genserver
- #mix
- #absinthe
- #remote-other
- #otp
- #plug
- #how-to-question
- #macros
- #postgres
- #channels
- #elixirconf
- #exunit
- #discussion
- #code-sync
- #javascript
- #podcasts
- #onsite
- #dialyzer
- #docker
- #authentication
- #umbrella
- #full-time-contract
- #podcasts-by-brainlid
- #ecto-query
- #elixir-ls
- #phoenix_html
- #iex
- #blog-post
- #graphql
- #genstage
- #ai
- #websockets
- #supervisor
- #elixirconf-us
- #advent-of-code
- #distillery
- #processes
- #forms
- #api
- #metaprogramming
- #hex
- #security
Our Sponsors
Build Elixir applications with speed and confidence.
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 for Elixir devs who love to ship. Start your free account.
Practical resources that improve the lives of professional developers.
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!"