Multi-Line Comments in Ruby?
This is how it looks (via screenshot) – otherwise it’s hard to interpret how the above comments will look. Click to Zoom-in:
ruby
undefined method (NoMethodError) ruby
This is because you are calling method choices, before defining it. Write the code as below: I used break, to exit from the while loop. Otherwise it will create an infinite loop.
How to check if a value exists in an array in Ruby
You’re looking for include?:
Ruby array to string conversion
I’ll join the fun with: EDIT: Some string interpolation to add the first and last single quote 😛
How to sum array of numbers in Ruby?
Try this: See Ruby’s Enumerable Documentation (note: the 0 base case is needed so that 0 will be returned on an empty array instead of nil)
Rails 4 RoutingError: No Route Matches
form_for @movie.name should be form_for @movie. I can’t tell what’s going on, but I suspect this is somehow giving you a <form action=””>.
What does “+=” (plus equals) mean?
+= is a shorthand operator. is the same as
Ruby equivalent for Python’s “try”?
Use this as an example: The equivalent code in Python would be:
warning: constant ::Fixnum is deprecated When generating new model
This warnings appear because you are using ruby 2.4.0. This version introduced this change: Unify Fixnum and Bignum into Integer See here for the announcement: https://www.ruby-lang.org/en/news/2016/12/25/ruby-2-4-0-released/ The warnings come from the activesupport gem which is part of rails and will be fixed in an upcoming release. For now you can just ignore those warnings. Update: … Read more
Difference between `not` and `!` in ruby
They are almost synonymous, but not quite. The difference is that ! has a higher precedence than not, much like && and || are of higher precedence than and and or. ! has the highest precedence of all operators, and not one of the lowest, you can find the full table at the Ruby docs. As an example, consider: In the first example, ! has the highest precedence, so you’re effectively saying false && … Read more