71 lines
1.4 KiB
Markdown
71 lines
1.4 KiB
Markdown
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# learning
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stuff we learned along the way
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## 2021-12-28
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Stuff i learned about go
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- `:=` short assignment, infers type: `x := 4`. vs "long" assignment: `var x int; x = 4`
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- expressive ifs: declare, assign, evaluate
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```
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if x := isBar(); x > 10 {
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println("big number")
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} else {
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println("it's kind of small")
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}
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```
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- `defer` wrapup (e.g. `conn.Close()`)
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- data structures are array (fixed), slice (variable), and channel
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- mulitiple returns. common convention:
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```
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foo, err := bar()
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if err != nil {
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return err
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}
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```
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- pointers 😬
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- use `make` to make arrays, slices, channels
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- `for` is the only loop.
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- structs and interfaces. here's a pair type:
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```
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type pair struct {
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x, y int
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}
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```
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and here's a toString interface:
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```
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type Stringer interface {
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toString() string
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}
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```
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and here's adding a method to a struct to implement the interface:
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```
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func(p pair) toString() string {
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return fmt.Sprintf("(%d, %d)", p.x, p.y)
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}
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```
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and here's using the compiler to check the interface:
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```
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var p Stringer = pair{3, 4}
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```
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resources
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- https://learnxinyminutes.com/docs/go/
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- https://www.youtube.com/watch?v=Eb1Q98PmyLQ
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- https://www.youtube.com/watch?v=oyKrI8e1-9U&t
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- https://pkg.go.dev/net/http
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- https://github.com/josa42/coc-go
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