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ruby includethis or that
values = ["val1", "val2", "val3", "val4"].to_set
myarray.any? { |x| values.include?(x) }
Source: stackoverflow.com
ruby include?
What's the difference between "include" and "require" in Ruby?
Answer:
The include and require methods do very different things.
The require method does what include does in most other programming languages: run another file. It also tracks what you've required in the past and won't require the same file twice. To run another file without this added functionality, you can use the load method.
The include method takes all the methods from another module and includes them into the current module. This is a language-level thing as opposed to a file-level thing as with require. The include method is the primary way to "extend" classes with other modules (usually referred to as mix-ins). For example, if your class defines the method "each", you can include the mixin module Enumerable and it can act as a collection. This can be confusing as the include verb is used very differently in other languages.
Source
So if you just want to use a module, rather than extend it or do a mix-in, then you'll want to use require.
Oddly enough, Ruby's require is analogous to C's include, while Ruby's include is almost nothing like C's include.
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