Sha256: b6c026a477967dbe2783bf18376b06d0c353c77a861a07e1c63ce5c8178c9b47
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Size: 1.36 KB
Versions: 7
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Contents
module Parliament
module Grom
module Decorator
module Helpers
# Namespace for utility methods
module Utils
class << self
# Checks that a collection responds to first and that the first element is of the given class
#
# @param [Enumerable] enumerable object which responds to #first
# @param [Class] klass the class we expect the first element to be
#
# @example When the first element is of the expected class
# Parliament::Grom::Decorator::Helpers::Utils.type_safe_first(['hello'], String) #=> 'hello'
#
# @example When the first element is not of the expected class
# Parliament::Grom::Decorator::Helpers::Utils.type_safe_first(['hello'], Fixnum) #=> nil
#
# @example When the enumerable does not respond to first
# Parliament::Grom::Decorator::Helpers::Utils.type_safe_first('hello', String) #=> nil
#
# @return [String] formatted date range
def type_safe_first(enumerable, klass)
return nil unless enumerable.respond_to?(:first)
first_element = enumerable.first
return nil unless first_element.is_a?(klass)
first_element
end
end
end
end
end
end
end
Version data entries
7 entries across 7 versions & 1 rubygems