Visibility of function and state variable

[AnandK-2024]

• External functions are part of the contract interface. An external function f cannot be called internally (i.e. f() does not work , but this.f() works). External functions are sometimes more efficient when they receive large arrays of data. For state variables, external is not possible.

• Public functions are part of the contract interface and can be either called internally or via messages . For public state variables, an automatic getter function (see below) is generated.

• Internal functions and state variables can only be accessed internally, without using this.

• Private functions and state variables are only visible for the contract they are defined in and not in derived contracts.

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external may be sufficient instead of public