Add ch-2 in Ruby

1 files changed, 63 insertions, 0 deletions

diff --git a/challenge-341/spadacciniweb/ruby/ch-2.rb b/challenge-341/spadacciniweb/ruby/ch-2.rb
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+# Task 2: Reverse Prefix
+# Submitted by: Mohammad Sajid Anwar
+# 
+# You are given a string, $str and a character in the given string, $char.
+# Write a script to reverse the prefix upto the first occurrence of the given $char in the given string $str and return the new string.
+# 
+# Example 1
+# Input: $str = "programming", $char = "g"
+# Output: "gorpmming"
+# 
+# Reverse of prefix "prog" is "gorp".
+# 
+# Example 2
+# Input: $str = "hello", $char = "h"
+# Output: "hello"
+# 
+# Example 3
+# Input: $str = "abcdefghij", $char = "h"
+# Output: "hgfedcbaj"
+# 
+# Example 4
+# Input: $str = "reverse", $char = "s"
+# Output: "srevere"
+# 
+# Example 5
+# Input: $str = "perl", $char = "r"
+# Output: "repl"
+
+def reverse_prefix(str, char)
+    chars = str.split('')
+    new_str = ''
+    (1..str.length).each do |_|
+        letter = chars.shift
+        new_str.concat(letter)
+        if letter == char
+            new_str = new_str.reverse
+            break
+        end
+    end
+    new_str.concat(chars.join())
+
+    printf "'%s' '%s' -> '%s'\n", str, char, new_str
+end
+
+str = "programming"
+char = "g"
+reverse_prefix(str, char)
+
+str = "hello"
+char = "h"
+reverse_prefix(str, char)
+
+str = "abcdefghij"
+char = "h"
+reverse_prefix(str, char)
+
+str = "reverse"
+char = "s"
+reverse_prefix(str, char)
+
+str = "perl"
+char = "r"
+reverse_prefix(str, char)