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array.include? 'foo' or array.include? 'bar' is a syntax error (unexpected keyword_or). Parentheses solve the problem, but as I'm new to Ruby I've no idea which of the following is considered more idiomatic:
array.include?('foo') or array.include?('bar') (array.include? 'foo') or (array.include? 'bar') Does this come down to personal preference, or is one approach considered more "correct"?
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If a method has parameters, always use parentheses in the def of that method. If a method has one parameter, you may omit the parentheses in the method call. If a method has more than one parameter, always use parentheses in the method call. Always use parentheses if any of the arguments contain parentheses.
One thing that many early Rubyists fail to realize about square brackets ( [] ) in Ruby is that they are nothing more than a method with some added syntactic sugar. Everything is an object in Ruby, and square brackets are just a method call on those objects.
The curly brackets { } are used to initialize hashes. The documentation for initializer case of { } is in ri Hash::[] The square brackets are also commonly used as a method in many core ruby classes, like Array, Hash, String, and others.
That's right: In Ruby, when you define or call (execute, use) a method, you can omit the parentheses.
I'd suggest you take a look at the community-driven Ruby coding style guide, here particularly the section on Syntax.
Omit parentheses around parameters for methods that are part of an internal DSL (e.g. Rake, Rails, RSpec), methods that are with "keyword" status in Ruby (e.g. attr_reader, puts) and attribute access methods. Use parentheses around the arguments of all other method invocations. - excerpt from the guide
class Person attr_reader :name, :age # omitted end temperance = Person.new('Temperance', 30) temperance.name puts temperance.age x = Math.sin(y) array.delete(e) If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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