Created
March 20, 2023 07:06
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| # Example 1: Monkey patching the String class | |
| class String | |
| def to_b | |
| return true if self == "true" | |
| return false if self == "false" | |
| raise ArgumentError.new("invalid value for Boolean: #{self}") | |
| end | |
| end | |
| # Usage: | |
| puts "true".to_b # outputs: true | |
| puts "false".to_b # outputs: false | |
| puts "foo".to_b # raises ArgumentError: invalid value for Boolean: foo | |
| # Example 2: Monkey patching the Array class | |
| class Array | |
| def sum | |
| self.inject(0) { |sum, x| sum + x } | |
| end | |
| end | |
| # Usage: | |
| puts [1, 2, 3].sum # outputs: 6 | |
| puts [4, 5, 6].sum # outputs: 15 | |
| # Example 3: Monkey patching the Hash class | |
| class Hash | |
| def keys_to_strings | |
| new_hash = {} | |
| self.each { |k, v| new_hash[k.to_s] = v } | |
| new_hash | |
| end | |
| end | |
| # Usage: | |
| h = { name: "John", age: 30 } | |
| puts h.keys_to_strings # outputs: {"name"=>"John", "age"=>30} |
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