Go was created to address issues with other imperative languages like C and C++ through its approach to memory management, concurrency, and software architecture. Go aims to make common programming tasks like concurrency, collections, and memory management straightforward and easy to use correctly. While it has some quirks to be aware of, overall Go provides a lightweight yet powerful programming language well-suited for building reliable concurrent systems.

1. C-spirit reborn, or why
Go was bound to be
created
BOHDAN TROTSENKO

2. C, C++
CMyClass instance;
instance.DoSomething();

3. …
void *p = get_memory_on_stack(sizeof(CMyClass));
try {
p.ctr();
p.DoSomething();
} catch (...)
{
p.~dstr();
}

4. Imperative Languages
C, C++
Go
Java, C#

5. Enterprise principle
The straight-forward way to do
things is the right way to do things

6. func FillInp(path string, res chan string) {
var (
file *os.File
err error
)
defer close(res)
if file, err = os.Open(path); err != nil {
fmt.Println("Error opening file", err)
return
}
defer file.Close()

7. … some horrible code
sem := make(chan bool, parallelism) // semaphore
for perm := 0; perm < parallelism; perm++ {
sem <- true // add initial values
}
for cs := 0; cs < len(cases); cs++ {
<-sem // read values
thiscase := cs
go func() {
Solve(&cases[thiscase])
sem <- true // permit others to continue
}()
}

10. protobuf
message Test {
required string label = 1;
optional int32 type = 2 [default=77];
repeated int64 reps = 3;
optional group OptionalGroup = 4 {
required string RequiredField = 5;
}
}

11. usage of protobuf
test := &example.Test {
Label: proto.String("hello"),
Type: proto.Int32(17),
Optionalgroup: &example.Test_OptionalGroup {
RequiredField: proto.String("good bye"),
},
}
data, err := proto.Marshal(test)
if err != nil {
log.Fatal("marshaling error: ", err)
}

12. A few gotchas…
dbg_f("Awaiting writer...")
<-outWG
dbg_ln("done.")
////////////////
hostname := packet[start:end]

13. Bottom line
Go is lightweight and powerfull
Collections and memory made right
Concurrency made right
Software architecture made wonderful

14. bohdan@trotsenko.com.ua
http://trotsenko.com.ua
@modosansreves