dozens/gomud

dozens ad4efeb8c2 hello world

- add readme
- make an echo server

2021-12-28 11:45:57 -07:00

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learning

stuff we learned along the way

2021-12-28

Stuff i learned about go

:= short assignment, infers type: x := 4. vs "long" assignment: var x int; x = 4

expressive ifs: declare, assign, evaluate

if x := isBar(); x > 10 {
  println("big number")
} else {
  println("it's kind of small")
}

defer wrapup (e.g. conn.Close())
data structures are array (fixed), slice (variable), and channel

mulitiple returns. common convention:

foo, err := bar()
if err != nil {
  return err
}

pointers 😬
use make to make arrays, slices, channels
for is the only loop.
structs and interfaces. here's a pair type:
```
type pair struct {
  x, y int
}
```
and here's a toString interface:
```
type Stringer interface {
  toString() string
}
```
and here's adding a method to a struct to implement the interface:
```
func(p pair) toString() string {
  return fmt.Sprintf("(%d, %d)", p.x, p.y)
}
```
and here's using the compiler to check the interface:
```
var p Stringer = pair{3, 4}
```

resources