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* chg: new code settings * New: golang emitter * wip: chat-room package * wip: temporary disable mainly because of golang/go#13675 in chat-room.go * chg: make build params update Co-authored-by: Malcolm Jones <malcolm@adobe.com>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,168 @@ | ||
| ``` | ||
| /* | ||
| ******************************************************************************** | ||
| Golang - Asterisk and Ampersand Cheatsheet | ||
| SOURCE: https://gist.github.com/josephspurrier/7686b139f29601c3b370 | ||
| ******************************************************************************** | ||
| Also available at: https://play.golang.org/p/lNpnS9j1ma | ||
| Allowed: | ||
| -------- | ||
| p := Person{"Steve", 28} stores the value | ||
| p := &Person{"Steve", 28} stores the pointer address (reference) | ||
| PrintPerson(p) passes either the value or pointer address (reference) | ||
| PrintPerson(*p) passes the value | ||
| PrintPerson(&p) passes the pointer address (reference) | ||
| func PrintPerson(p Person) ONLY receives the value | ||
| func PrintPerson(p *Person) ONLY receives the pointer address (reference) | ||
| Not Allowed: | ||
| -------- | ||
| p := *Person{"Steve", 28} illegal | ||
| func PrintPerson(p &Person) illegal | ||
| */ | ||
| ``` | ||
|
|
||
| # values_pointers.go | ||
|
|
||
| ``` | ||
| package main | ||
| import ( | ||
| "fmt" | ||
| ) | ||
| type Person struct { | ||
| Name string | ||
| Age int | ||
| } | ||
| // This only works with *Person, does not work with Person | ||
| // Only works with Test 2 and Test 3 | ||
| func (p *Person) String() string { | ||
| return fmt.Sprintf("%s is %d", p.Name, p.Age) | ||
| } | ||
| // This works with both *Person and Person, BUT you can't modiy the value and | ||
| // it takes up more space | ||
| // Works with Test 1, Test 2, Test 3, and Test 4 | ||
| /*func (p Person) String() string { | ||
| return fmt.Sprintf("%s is %d", p.Name, p.Age) | ||
| }*/ | ||
| // ***************************************************************************** | ||
| // Test 1 - Pass by Value | ||
| // ***************************************************************************** | ||
| func test1() { | ||
| p := Person{"Steve", 28} | ||
| printPerson1(p) | ||
| updatePerson1(p) | ||
| printPerson1(p) | ||
| } | ||
| func updatePerson1(p Person) { | ||
| p.Age = 32 | ||
| printPerson1(p) | ||
| } | ||
| func printPerson1(p Person) { | ||
| fmt.Printf("String: %v | Name: %v | Age: %d\n", | ||
| p, | ||
| p.Name, | ||
| p.Age) | ||
| } | ||
| // ***************************************************************************** | ||
| // Test 2 - Pass by Reference | ||
| // ***************************************************************************** | ||
| func test2() { | ||
| p := &Person{"Steve", 28} | ||
| printPerson2(p) | ||
| updatePerson2(p) | ||
| printPerson2(p) | ||
| } | ||
| func updatePerson2(p *Person) { | ||
| p.Age = 32 | ||
| printPerson2(p) | ||
| } | ||
| func printPerson2(p *Person) { | ||
| fmt.Printf("String: %v | Name: %v | Age: %d\n", | ||
| p, | ||
| p.Name, | ||
| p.Age) | ||
| } | ||
| // ***************************************************************************** | ||
| // Test 3 - Pass by Reference (requires more typing) | ||
| // ***************************************************************************** | ||
| func test3() { | ||
| p := Person{"Steve", 28} | ||
| printPerson3(&p) | ||
| updatePerson3(&p) | ||
| printPerson3(&p) | ||
| } | ||
| func updatePerson3(p *Person) { | ||
| p.Age = 32 | ||
| printPerson3(p) | ||
| } | ||
| func printPerson3(p *Person) { | ||
| fmt.Printf("String: %v | Name: %v | Age: %d\n", | ||
| p, | ||
| p.Name, | ||
| p.Age) | ||
| } | ||
| // ***************************************************************************** | ||
| // Test 4 - Pass by Value (requires more typing) | ||
| // ***************************************************************************** | ||
| func test4() { | ||
| p := &Person{"Steve", 28} | ||
| printPerson4(*p) | ||
| updatePerson4(*p) | ||
| printPerson4(*p) | ||
| } | ||
| func updatePerson4(p Person) { | ||
| p.Age = 32 | ||
| printPerson4(p) | ||
| } | ||
| func printPerson4(p Person) { | ||
| fmt.Printf("String: %v | Name: %v | Age: %d\n", | ||
| p, | ||
| p.Name, | ||
| p.Age) | ||
| } | ||
| // ***************************************************************************** | ||
| // Main | ||
| // ***************************************************************************** | ||
| /* | ||
| Outputs: | ||
| String: {Steve 28} | Name: Steve | Age: 28 | ||
| String: {Steve 32} | Name: Steve | Age: 32 | ||
| String: {Steve 28} | Name: Steve | Age: 28 | ||
| String: Steve is 28 | Name: Steve | Age: 28 | ||
| String: Steve is 32 | Name: Steve | Age: 32 | ||
| String: Steve is 32 | Name: Steve | Age: 32 | ||
| String: Steve is 28 | Name: Steve | Age: 28 | ||
| String: Steve is 32 | Name: Steve | Age: 32 | ||
| String: Steve is 32 | Name: Steve | Age: 32 | ||
| String: {Steve 28} | Name: Steve | Age: 28 | ||
| String: {Steve 32} | Name: Steve | Age: 32 | ||
| String: {Steve 28} | Name: Steve | Age: 28 | ||
| */ | ||
| func main() { | ||
| test1() | ||
| test2() | ||
| test3() | ||
| test4() | ||
| } | ||
| ``` |
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