What is the favorable naming convention for methods or properties returning a boolean value in Ruby? -

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i've seen of these:

  • is_valid

  • is_valid?

  • valid?

is there preferred one?

edit: more conditionals:

  • has_comment has_comment? comment?

  • was_full was_full? full?

please add more descriptive examples.

i think convention add '?' @ end of method instead of 'is'

  • valid?

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