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# File 'lib/number_to_kanji/small_number_to_kanji.rb', line 11
def call(number)
raise(::TypeError) unless number.is_a?(::Integer)
raise(::NumberToKanji::Exceptions::NegativeNumberError) if number.negative?
raise(::RangeError, 'Numbers equal to or larger than 10^4 is not supported.') if number >= ::NumberToKanji::SmallNumberToKanji::RANGE_END
return ::NumberToKanji::KANJI_MAP[0] if number.zero?
zero_padded_number = format('%04<number>d', number: number)
thousands, hundreds, tens, ones = zero_padded_number.to_s.chars.map { |i| Integer(i, 10) }
"#{_thousands_to_kanji(thousands)}#{_hundreds_to_kanji(hundreds)}#{_tens_to_kanji(tens)}#{_ones_to_kanji(ones)}"
end
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