Answers questions 1-36 #207
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houndci-bot
reviewed
Jun 24, 2017
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| # return true if a string contains any special characters | ||
| # where 'special character' means anything apart from the letters | ||
| # a-z (uppercase and lower) or numbers | ||
| def check_a_string_for_special_characters(string) | ||
| /\W/ === string |
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Reverse the order of the operands /\W/ === string.
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| # get all the elements in an array, up until the first element | ||
| # which is greater than five. e.g. | ||
| # [1, 3, 5, 4, 1, 2, 6, 2, 1, 3, 7] | ||
| # becomes [1, 3, 5, 4, 1, 2] | ||
| def get_elements_until_greater_than_five(array) | ||
| array.take_while { |element| element <= 5} |
| def longest_word_in_array(array) | ||
| array.max { |a,b| a.length <=> b.length } |
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Use max_by(&:length) instead of max { |a, b| a.length <=> b.length }.
Space missing after comma.
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| # turn an array of numbers into two arrays of numbers, one an array of | ||
| # even numbers, the other an array of odd numbers | ||
| # even numbers come first | ||
| # so [1, 2, 3, 4, 5, 6] becomes [[2, 4, 6], [1, 3, 5]] | ||
| def separate_array_into_even_and_odd_numbers(array) | ||
| [array.select { |el| el.even? }, array.select { |el| el.odd? } ] |
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Space inside square brackets detected.
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| # turn a positive integer into a negative integer. A negative integer | ||
| # stays negative | ||
| def make_numbers_negative(number) | ||
| -(number.abs) |
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Don't use parentheses around a method call.
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| # cut strings in half, and return the first half, e.g. | ||
| # 'banana' becomes 'ban'. If the string is an odd number of letters | ||
| # round up - so 'apple' becomes 'app' | ||
| def get_first_half_of_string(string) | ||
| midpoint = (string.length.to_f / 2).ceil | ||
| string[0...(midpoint)] |
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Don't use parentheses around a variable.
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| # discard the first 3 elements of an array, | ||
| # e.g. [1, 2, 3, 4, 5, 6] becomes [4, 5, 6] | ||
| def all_elements_except_first_3(array) | ||
| array.select {|el| array.index(el) > 2 } |
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| # don't reverse the array, but reverse every word inside it. e.g. | ||
| # ['dog', 'monkey'] becomes ['god', 'yeknom'] | ||
| def reverse_every_element_in_array(array) | ||
| array.map { |value| value.reverse } |
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| # keep only the elements that start with an a | |||
| def select_elements_starting_with_a(array) | |||
| array.select { |word| word[0].downcase == 'a' } | |||
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Use casecmp instead of downcase ==.
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Corrects a couple of errors/typos in the questions.