JavaScript supports monkey patching by modifying prototype objects too. But it is considered to be bad practice because it modify the behavior globally, and som

JavaScript supports monkey patching by modifying prototype objects too. But it is considered to be bad practice because it modify the behavior globally, and some method name conflict may cause trouble. An example is Array.prototype.contains couldn't be added because it will break another library, so it is renamed to Array.prototype.includes. (Source: https://github.com/tc39/proposal-Array.prototype.includes https://github.com/tc39/proposal-Array.prototype.includes)