Slide 1

Slide 1 text

The Scandalous Story of the Dreadful Code Written by the Best of Us Katrina Owen ! GitHub

Slide 2

Slide 2 text

I never get the notifications when we run out of stuff.

Slide 3

Slide 3 text

resource depleted

Slide 4

Slide 4 text

Alice reports that we are out of ammo. TEXT

Slide 5

Slide 5 text

Alice says we're running low on ammo. HTML

Slide 6

Slide 6 text

copy | paste

Slide 7

Slide 7 text

package notify

Slide 8

Slide 8 text

it's totally fine

Slide 9

Slide 9 text

// TODO: add tests

Slide 10

Slide 10 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... } func Dispatch(s string, p *game.Person) { // ... horrible things... } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... }

Slide 11

Slide 11 text

Did the message say the right thing?

Slide 12

Slide 12 text

Did the right people get the message?

Slide 13

Slide 13 text

\o/

Slide 14

Slide 14 text

The No-op No-op No-op Interface Maneuver

Slide 15

Slide 15 text

one undo

Slide 16

Slide 16 text

no-op #1

Slide 17

Slide 17 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... } func Dispatch(s string, p *game.Person) { // ... horrible things... } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... } no-op #1

Slide 18

Slide 18 text

package comms type Signal struct{} no-op #1

Slide 19

Slide 19 text

package comms type Signal struct{} func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { } func (*Signal) Dispatch(s string, p *game.Person) { } func (*Signal) Register(e game.Event, p *game.Person) { } no-op #1

Slide 20

Slide 20 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... } func Dispatch(s string, p *game.Person) { // ... horrible things... } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... } no-op #1

Slide 21

Slide 21 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... } func Dispatch(s string, p *game.Person) { // ... horrible things... } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... } no-op #1

Slide 22

Slide 22 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) } func Dispatch(s string, p *game.Person) { // ... horrible things... Sig.Dispatch(s, p) } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... Sig.Register(e, p) } no-op #1

Slide 23

Slide 23 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) } func Dispatch(s string, p *game.Person) { // ... horrible things... Sig.Dispatch(s, p) } func Register(e game.Event, p *game.Person) { // ... kind of confusing stuff... Sig.Register(e, p) } no-op #1

Slide 24

Slide 24 text

package comms var Sig *Signal func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { } func (*Signal) Dispatch(s string, p *game.Person) { } func (*Signal) Register(e game.Event, p *game.Person) { } no-op #1

Slide 25

Slide 25 text

package comms var Sig *Signal func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { } func (*Signal) Dispatch(s string, p *game.Person) { } func (*Signal) Register(e game.Event, p *game.Person) { } no-op #1

Slide 26

Slide 26 text

package comms var Sig *Signal func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { } func (*Signal) Dispatch(s string, p *game.Person) { } func (*Signal) Register(e game.Event, p *game.Person) { } no-op #1

Slide 27

Slide 27 text

no-op #1

Slide 28

Slide 28 text

no-op #2

Slide 29

Slide 29 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) }

Slide 30

Slide 30 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) }

Slide 31

Slide 31 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) }

Slide 32

Slide 32 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) } func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { }

Slide 33

Slide 33 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... Sig.Broadcast(s, f, c) } func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { }

Slide 34

Slide 34 text

no-op #2 package comms func Broadcast(s string, f game.Freq, c Crypto) { Sig.Broadcast(s, f, c) } func (*Signal) Broadcast(s string, f game.Freq, c Crypto) { // ... a mountain of complexity... }

Slide 35

Slide 35 text

no-op #2

Slide 36

Slide 36 text

no-op #3

Slide 37

Slide 37 text

no-op #3 package notify func ResourceDepleted(r game.Resource, p *game.Person) { // ... comms.Broadcast(...) // ... }

Slide 38

Slide 38 text

no-op #3 package notify func ResourceDepleted(com *comms.Signal, r game.Resource, p *game.Person ) { // ... comms.Broadcast(...) // ... }

Slide 39

Slide 39 text

package api notify.ResourceDepleted(comms.Sig, resource, person) no-op #3

Slide 40

Slide 40 text

no-op #3 package notify func ResourceDepleted(com *comms.Signal, r game.Resource, p *game.Person ) { // ... comms.Broadcast(...) // ... }

Slide 41

Slide 41 text

package notify func ResourceDepleted(com *comms.Signal, r game.Resource, p *game.Person ) { // ... com.Broadcast(...) // ... } no-op #3

Slide 42

Slide 42 text

package comms func Broadcast(s string, f game.Freq, c Crypto) { Sig.Broadcast(s, f, c) } func Dispatch(s string, p *game.Person) { Sig.Dispatch(s, p) } func Register(e game.Event, p *game.Person) { Sig.Register(e, p) } no-op #3

Slide 43

Slide 43 text

no-op #3 package comms

Slide 44

Slide 44 text

no-op #3

Slide 45

Slide 45 text

interface

Slide 46

Slide 46 text

package comms type Transmitter interface { Broadcast(string, game.Freq, Crypto) Dispatch(string, *game.Person) Register(game.Event, *game.Person) } interface

Slide 47

Slide 47 text

interface package notify func ResourceDepleted(com *comms.Signal, r game.Resource, p *game.Person ) { // ... com.Broadcast(...) // ... }

Slide 48

Slide 48 text

interface package notify func ResourceDepleted(com *comms.Signal, r game.Resource, p *game.Person ) { // ... com.Broadcast(...) // ... }

Slide 49

Slide 49 text

interface package notify func ResourceDepleted(com comms.Transmitter, r game.Resource, p *game.Person ) { // ... com.Broadcast(...) // ... }

Slide 50

Slide 50 text

interface package notify type fakeTransmitter struct { broadcasts []fakeBroadcast dispatches []fakeDispatch events []fakeEvent }

Slide 51

Slide 51 text

package notify type fakeTransmitter struct { broadcasts []fakeBroadcast dispatches []fakeDispatch events []fakeEvent } func (*fakeTransmitter) Broadcast(...) { } func (*fakeTransmitter) Dispatch(...) { } func (*fakeTransmitter) Register(...) { } interface

Slide 52

Slide 52 text

no-op no-op no-op interface maneuver

Slide 53

Slide 53 text

clean code

Slide 54

Slide 54 text

The Flocking Rules

Slide 55

Slide 55 text

find the things that are most alike rule #1

Slide 56

Slide 56 text

select the smallest difference between them rule #2

Slide 57

Slide 57 text

make the smallest change that will remove that difference rule #3

Slide 58

Slide 58 text

the flocking rules

Slide 59

Slide 59 text

resource found

Slide 60

Slide 60 text

text vs html

Slide 61

Slide 61 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, )

Slide 62

Slide 62 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, )

Slide 63

Slide 63 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, )

Slide 64

Slide 64 text

html := fmt.Sprintf( "%s discovered "+ "%s"+ " at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 65

Slide 65 text

html := fmt.Sprintf( "%s discovered "+ "%s"+ " at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 66

Slide 66 text

html := fmt.Sprintf( "%s discovered "+ "%s"+ " at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 67

Slide 67 text

find the things that are most alike rule #1

Slide 68

Slide 68 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 69

Slide 69 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 70

Slide 70 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 71

Slide 71 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 72

Slide 72 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 73

Slide 73 text

select the smallest difference between them rule #2

Slide 74

Slide 74 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 75

Slide 75 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 76

Slide 76 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 77

Slide 77 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 78

Slide 78 text

make the smallest change that will remove that difference rule #3

Slide 79

Slide 79 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", v4, v5, v6, v7, v8, v9, v10, v11, )

Slide 80

Slide 80 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered %s at %s.", anchor1, anchor2, anchor3, )

Slide 81

Slide 81 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered %s at %s.", anchor1, anchor2, anchor3, )

Slide 82

Slide 82 text

anchor1 := fmt.Sprintf( "%s", p.Handle, template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 83

Slide 83 text

text := fmt.Sprintf( "%s discovered %s at %s.", v1, v2, v3, ) html := fmt.Sprintf( "%s discovered %s at %s.", anchor1, anchor2, anchor3, )

Slide 84

Slide 84 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, v1, v2, v3, ) html := fmt.Sprintf( msg, anchor1, anchor2, anchor3, )

Slide 85

Slide 85 text

find the things that are most alike rule #1

Slide 86

Slide 86 text

anchor1 := fmt.Sprintf( "%s", p.Handle, template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 87

Slide 87 text

select the smallest difference between them rule #2

Slide 88

Slide 88 text

anchor1 := fmt.Sprintf( "%s", p.Handle, template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 89

Slide 89 text

anchor1 := fmt.Sprintf( "%s", p.Handle, template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 90

Slide 90 text

make the smallest change that will remove that difference rule #3

Slide 91

Slide 91 text

anchor1 := fmt.Sprintf( "%s", p.Handle, template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 92

Slide 92 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 93

Slide 93 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 94

Slide 94 text

find the things that are most alike rule #1

Slide 95

Slide 95 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 96

Slide 96 text

select the smallest difference between them rule #2

Slide 97

Slide 97 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.Name), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.Name), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 98

Slide 98 text

make the smallest change that will remove that difference rule #3

Slide 99

Slide 99 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.String()), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 100

Slide 100 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.String()), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 101

Slide 101 text

find the things that are most alike rule #1

Slide 102

Slide 102 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.String()), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 103

Slide 103 text

select the smallest difference between them rule #2

Slide 104

Slide 104 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.String()), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 105

Slide 105 text

make the smallest change that will remove that difference rule #3

Slide 106

Slide 106 text

anchor1 := fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) anchor2 := fmt.Sprintf( "%s", r.URL(), template.HTMLEscapeString(r.String()), ) anchor3 := fmt.Sprintf( "%s", loc.URL(), template.HTMLEscapeString(loc.String()), )

Slide 107

Slide 107 text

type linker interface { String() string URL() string }

Slide 108

Slide 108 text

type linker interface { String() string URL() string }

Slide 109

Slide 109 text

func link(l linker) string { fmt.Sprintf( "%s", p.URL(), template.HTMLEscapeString(p.String()), ) }

Slide 110

Slide 110 text

func link(l linker) string { return fmt.Sprintf( "%s", l.URL(), template.HTMLEscapeString(l.String()), ) }

Slide 111

Slide 111 text

func link(l linker) string { return fmt.Sprintf( "%s", l.URL(), template.HTMLEscapeString(l.String()), ) }

Slide 112

Slide 112 text

find the things that are most alike rule #1

Slide 113

Slide 113 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p.Name, r.Name, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 114

Slide 114 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p.Name, r.Name, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 115

Slide 115 text

select the smallest difference between them rule #2

Slide 116

Slide 116 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p.Name, r.Name, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 117

Slide 117 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p.Name, r.Name, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 118

Slide 118 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p.Name, r.Name, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 119

Slide 119 text

make the smallest change that will remove that difference rule #3

Slide 120

Slide 120 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p, r, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 121

Slide 121 text

find the things that are most alike rule #1

Slide 122

Slide 122 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p, r, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 123

Slide 123 text

select the smallest difference between them rule #2

Slide 124

Slide 124 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, p, r, loc, ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 125

Slide 125 text

make the smallest change that will remove that difference rule #3

Slide 126

Slide 126 text

func text(l linker) string { return l.String() }

Slide 127

Slide 127 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, text(p), text(r), text(loc), ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 128

Slide 128 text

find the things that are most alike rule #1

Slide 129

Slide 129 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, text(p), text(r), text(loc), ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 130

Slide 130 text

select the smallest difference between them rule #2

Slide 131

Slide 131 text

msg := "%s discovered %s at %s." text := fmt.Sprintf( msg, text(p), text(r), text(loc), ) html := fmt.Sprintf( msg, link(p), link(r), link(loc), )

Slide 132

Slide 132 text

make the smallest change that will remove that difference rule #3

Slide 133

Slide 133 text

func text(l linker) string { return l.String() } func link(l linker) string { return fmt.Sprintf( "%s", l.URL(), template.HTMLEscapeString(l.String()), ) }

Slide 134

Slide 134 text

func format(fn func(linker) string) string { // ... }

Slide 135

Slide 135 text

func format(..., fn func(linker) string, ...) string { // ... }

Slide 136

Slide 136 text

func format(msg string, fn func(linker) str... args := make([]interface{}, len(values)) for i, v := range values { args[i] = fn(v) } return fmt.Sprintf(msg, args...) }

Slide 137

Slide 137 text

func format(msg string, fn func(linker) str... args := make([]interface{}, len(values)) for i, v := range values { args[i] = fn(v) } return fmt.Sprintf(msg, args...) }

Slide 138

Slide 138 text

msg := "%s discovered %s at %s." text := fmt(msg, text, p, r, loc) html := fmt(msg, link, p, r, loc)

Slide 139

Slide 139 text

type message struct { template string vars []linker } func newMessage(template string, vars ...linker) message { return message{ template: template, vars: vars, } }

Slide 140

Slide 140 text

func (msg message) fmt(fn func(linker) string) string { args := make([]interface{}, len(msg.vars)) for i, v := range msg.vars { args[i] = fn(v) } return fmt.Sprintf(msg.template, args...) }

Slide 141

Slide 141 text

func (msg message) text() string { return msg.fmt(text) } func (msg message) html() string { return msg.fmt(link) }

Slide 142

Slide 142 text

s := "%s discovered %s at %s." msg := newMessage(s, p, r, loc) // ... msg.text() // ... msg.html()

Slide 143

Slide 143 text

text := fmt.Sprintf( "%s discovered %s at %s.", p.Name, r.Name, loc, ) html := fmt.Sprintf( "%s discovered "+ "%s "+ "at %s.", p.Handle, template.HTMLEscapeString(p.Name), r.TribeUUID(), r.UUID, template.HTMLEscapeString(r.Name), loc.Latitude, loc.Longitude, template.HTMLEscapeString(loc.String()), )

Slide 144

Slide 144 text

type message struct { template string vars []linker } func newMessage(template string, vars ...linker) message { return message{ template: template, vars: vars, } }

Slide 145

Slide 145 text

type message struct { template string vars []linker } func (msg message) text() string { return msg.fmt(text) } func (msg message) html() string { return msg.fmt(link) } func (msg message) fmt(fn func(linker) string) string { args := make([]interface{}, len(msg.vars)) for i, v := range msg.vars { args[i] = fn(v) } return fmt.Sprintf(msg.template, args...) }

Slide 146

Slide 146 text

type linker interface { String() string URL() string } func link(l linker) string { return fmt.Sprintf( "%s", l.URL(), template.HTMLEscapeString(l.String()), ) } func text(l linker) string { return l.String() }

Slide 147

Slide 147 text

Flock to Abstractions

Slide 148

Slide 148 text

Thank You

Slide 149

Slide 149 text

! Katrina Owen @kytrinyx