Function Visibility.md

23 - Function Visibility

Function Visibility Specifiers: Functions have to be specified as being public, external, internal or private:

1. public: Public functions are part of the contract interface and can be either called internally or via messages. 

2. external: External functions are part of the contract interface, which means they can be called from other contracts and via transactions. An external function f cannot be called internally (i.e. f() does not work, but this.f() works).

3. internal: Internal functions can only be accessed internally from within the current contract or contracts deriving from it

4. private: Private functions can only be accessed from the contract they are defined in and not even in derived contracts

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Slide Screenshot

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Slide Deck

• Function Visibility
  • public
  • external
  • internal
  • private
• public/external: Interface
• external: Not Internally
• internal: Base/Derived
• private: Contract
• Visibility: Access Control
• Security Implications

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References

• Youtube Reference