Web Reference: Each of these methods takes: A first argument, pattern (String or Regexp), that specifies the substring (s) to be replaced. A second argument, replacement (String or Hash), that determines the replacing string. A block that will determine the replacing string. String#concat Concatenates one or more strings onto the original string. The + operator is an alias for this method. We define an empty string as a string of zero length. You can check like this: Or even better, use the empty?method. Example: A blank string is a string that has either zero-length, or is composed ONLY of white space characters.
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