HackerRank Ruby – Strings – Methods II problem solution

In this HackerRank Ruby – Strings – Methods II problem solution In this challenge, your task is to write the following methods:

mask_article which appends strike tags around certain words in a text. The method takes 2 arguments: A string and an array of words. It then replaces all the instances of words in the text with the modified version.

A helper method strike, given one string, appends strike-off HTML tags around it. The strike-off HTML tag is <strike></strike>.

For example:

> strike(“Meow!”) # => “<strike>Meow!</strike>”

> strike(“Foolan Barik”) # => “<strike>Foolan Barik</strike>”

> mask_article(“Hello World! This is crap!”, [“crap”])

“Hello World! This is <strike>crap</strike>!”

Apply the helper method in completing your main method.

Problem solution.

# Enter your code here
def strike word
    "<strike>#{word}</strike>"
end

def mask_article s, arr
    arr.each do | w |
        striked = strike w
        s = s.gsub( /#{Regexp.escape( w )}/, striked )
    end
    return s
end

Second solution.

def strike (s)
    "<strike>" + s + "</strike>"
end

def mask_article (str, arr)
    arr.each do |word|
        str.gsub!(word, strike(word))
    end
    str
end

Third solution.

# Enter your code here
def mask_article(article, strike_words)
    strike_words.reduce(article) { |article, word| article.gsub(word, strike(word)) }
end

def strike(string)
    "<strike>#{string}</strike>"
end