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Document functional options (#1899)

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* Document functional options

* Update CONTRIBUTING.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

* Update CONTRIBUTING.md

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>

Co-authored-by: Tyler Yahn <MrAlias@users.noreply.github.com>
Co-authored-by: Anthony Mirabella <a9@aneurysm9.com>
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Robert Pająk 2021-05-12 03:28:46 +02:00 committed by GitHub
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CONTRIBUTING.md
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@ -294,6 +294,23 @@ func WithMyType(t MyType) Option {
}
```
##### Functional Options
```go
type optionFunc func(*config)
func (fn optionFunc) apply(c *config) {
fn(c)
}
// WithMyType sets t as MyType.
func WithMyType(t MyType) Option {
return optionFunc(func(c *config) {
c.MyType = t
})
}
```
#### Instantiation
Using this configuration pattern to configure instantiation with a `NewT`