6 left to do #227
6 left to do #227
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| # get the domain name *without* the .com part, from an email address | ||
| # so alex@makersacademy.com becomes makersacademy | ||
| def get_domain_name_from_email_address(email) | ||
| email[email.index("@")+1...email.index(".")] |
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| # get the average from an array, rounded to the nearest integer | ||
| # so [10, 15, 25] should return 17 | ||
| def average_of_array(array) | ||
| ((array.sum.to_f/array.length.to_f)+0.5).to_i |
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| # return the shortest word in an array | ||
| 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 }.
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| # return the shortest word in an array | ||
| def shortest_word_in_array(array) | ||
| array.min{|a,b| a.length <=> b.length } |
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Use min_by(&:length) instead of min { |a, b| a.length <=> b.length }.
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| # count the numbers of elements in an element which are palindromes | ||
| # a palindrome is a word that's the same backwards as forward | ||
| # e.g. 'bob'. So in the array ['bob', 'radar', 'eat'], there | ||
| # are 2 palindromes (bob and radar), so the method should return 2 | ||
| def number_of_elements_that_are_palindromes(array) | ||
| array.select{|x| x.reverse==x}.length |
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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) | ||
| string[0...((string.length.to_f/2).ceil)] |
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| # sort an array of words by their last letter, e.g. | ||
| # ['sky', 'puma', 'maker'] becomes ['puma', 'maker', 'sky'] | ||
| def array_sort_by_last_letter_of_word(array) | ||
| array.map{|x| x.reverse}.sort.map{|x| x.reverse} |
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| # remove instances of nil AND false from an array | ||
| def remove_nils_and_false_from_array(array) | ||
| array.compact!.delete_if{ |x| x==false } |
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| # keep only the elements that start with a vowel | ||
| def select_elements_starting_with_vowel(array) | ||
| array.select { |x| x[0]=~ /[aeiou]/} |
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| # keep only the elements that start with an a | |||
| def select_elements_starting_with_a(array) | |||
| array.select { |x| x[0]=="a" } | |||
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