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Using Ruby Gsub With a Hash

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Gsub with Hash We all have used gsub for global substitution of a pattern in string. The cool thing I came across today is, you can use hash to define the replacement.

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def cool_gsub_with_hash(str)
  str.gsub(/[aeiou]/, 'a' => '1', 'e' => '2', 'i' => '3', 'o' => '4', 'u' => '5')
end

> cool_gsub_with_hash("We all have used gsub for global substitution of a pattern in string. ")

 => "W2 1ll h1v2 5s2d gs5b f4r gl4b1l s5bst3t5t34n 4f 1 p1tt2rn 3n str3ng. "

> cool_gsub_with_hash("hello")

 => "h2ll4"

Here we are not restricted with single character replacements:

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def gsub_word_with_hash(str)
  str.gsub(/H(ello)?i?/, 'Hi' => "Namaste", "Hello" => "Wannakam")
end

> gsub_word_with_hash("Hello Chandan")
 => "Wannakam Chandan"
> gsub_word_with_hash("Hi Chandan")
 => "Namaste Chandan"

I found it quite interesting. Courtesy: Bozahidar

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