juantamad
Designing Elixir Systems Book Question
On page 23 of the book Designing Elixir Systems With Otp it says “Use div() and rem() to get integer division rather than /.”. For 7/6 gives 1.1666666666666667. How is div and rem better than 7/6?
Most Liked
JEG2
In the paragraph above your quote, we say, “… prefer integers or decimals over floats when you can.” This advice is based on the inaccuracy of floating-point arithmetic. If you want to follow our advice you need to avoid this problem:
iex(1)> 3 / 1
3.0
div/2 is how you do that.
NobbZ
It’s not about better or worse, it’s about “for integer division use div/rem, rather than / as the latter simply doesn’t do integer division but always returns a floating point number.”
NobbZ
It doesn’t say anything about using div/rem for floating point arithmetic, at least not in the portion you cite. There it just says that you can not use / for integer division…
Popular in Chat/Questions
Other popular topics
Latest on Elixir Forum
Sponsor Spotlight
We build reliable cloud platforms for business-critical systems.
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
- #javascript
- #code-sync
- #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
- #advent-of-code
- #elixirconf-us
- #distillery
- #processes
- #forms
- #api
- #metaprogramming
- #security
- #performance
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.
Real-time error tracking, performance insights, and observability for devs.
Practical resources that improve the lives of professional developers.
Develop your skills with books, videos, and courses.
Enabling companies to succeed by building software people love.
Courses that'll move you from confusion to "Aha, now I get it!"