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docs: add the topics Hoistings and Closures (#12021)

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cindRoberta 2021-09-30 06:43:26 -03:00 committed by GitHub
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@ -65,6 +65,7 @@ For more details and troubleshooting, please visit the [vab GitHub repository](h
* [Comments](#comments) * [Comments](#comments)
* [Functions](#functions) * [Functions](#functions)
* [Returning multiple values](#returning-multiple-values) * [Returning multiple values](#returning-multiple-values)
* [Hoistings](#hoistings)
* [Symbol visibility](#symbol-visibility) * [Symbol visibility](#symbol-visibility)
* [Variables](#variables) * [Variables](#variables)
* [V types](#v-types) * [V types](#v-types)
@ -95,6 +96,7 @@ For more details and troubleshooting, please visit the [vab GitHub repository](h
* [Mutable arguments](#mutable-arguments) * [Mutable arguments](#mutable-arguments)
* [Variable number of arguments](#variable-number-of-arguments) * [Variable number of arguments](#variable-number-of-arguments)
* [Anonymous & higher-order functions](#anonymous--higher-order-functions) * [Anonymous & higher-order functions](#anonymous--higher-order-functions)
* [Closures](#closures)
* [References](#references) * [References](#references)
* [Constants](#constants) * [Constants](#constants)
* [Builtin functions](#builtin-functions) * [Builtin functions](#builtin-functions)
@ -264,6 +266,8 @@ Again, the type comes after the argument's name.
Just like in Go and C, functions cannot be overloaded. Just like in Go and C, functions cannot be overloaded.
This simplifies the code and improves maintainability and readability. This simplifies the code and improves maintainability and readability.
### Hoistings
Functions can be used before their declaration: Functions can be used before their declaration:
`add` and `sub` are declared after `main`, but can still be called from `main`. `add` and `sub` are declared after `main`, but can still be called from `main`.
This is true for all declarations in V and eliminates the need for header files This is true for all declarations in V and eliminates the need for header files
@ -2137,6 +2141,8 @@ fn main() {
} }
``` ```
### Closures
V supports closures too. V supports closures too.
This means that anonymous functions can inherit variables from the scope they were created in. This means that anonymous functions can inherit variables from the scope they were created in.
They must do so explicitly by listing all variables that are inherited. They must do so explicitly by listing all variables that are inherited.