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SMITA VIJAYAKUMAR
Go Programming
INTRODUCTION TO
smita@exotel.in
Agenda
Modern Compute Environment
Focus: What Problem does it Solve?
History
How is it Achieved
For C Programmers - Major
Differences
Challenges in Modern
Compute Landscape
Environment
Multi-Core
Networked Systems
Computational Clusters
Web Programming Model
Thousands of Programmers
Same code base
Scale of Development
Legacy Languages
Language Feature Complex
Garbage Collection
Missing language support for Concurrency
Compilation Times
Dependency Management
Programmers digress from
the real task!
Crux:
Focus
“Go’s purpose is therefore not to do research
into programming language design; it is to
improve the working environment for its
designers and their coworkers.”
–Rob Pike
(Co-Designer of Go and Distinguished Engineer at Google)
History
History
Inception: 2007
Go 1.0 released in 2012
Rob Pike, Ken Thompson and Robert Griesemer
History
Binary = 2000 X C++ Source Bytes
Unused Library Includes
Conditional Includes
Extremely Slow Compilation
Even on Distributed Compilation System!
Desired Features
Light Weight
Increase Programmer Efficiency
Compiled Language
Concurrency
Garbage Collection
Statically Typed
How is it Achieved?
How
No unused import packages
Dependency graph is precise
No dependency cycles
Only exported data available
One object both exported and complete data
How
40X faster compilation times than C++!
Differences between
Go and C
Syntax
Import paths are URLs
Cleaner syntax
Syntax
//C
typedef struct A {
int a;
char b;
}
//Go
type A struct {
a int
b char
}
Syntax
/* C */
//Expression Syntax
int main(int argc, char *argv[])
// The Clockwise-Spiral Rule in C syntax parsing
int (*(*fp)(int (*)(int, int), int))(int, int)
/* Go */
// Type Syntax
func main(argc int, argv []string) int
//Left to right
f func(func(int,int) int, int) func(int, int) int
Syntax
//Go can also return multiple value from function
func ReadFile(r io.Reader) (num int, err error) {
...
}
...
n, err := ReadFile(r)
Syntax
package util
//Counter is visible when package is imported var Counter int
//name is not
var name string
//Seen
func ThisIsAlsoAvailable() error {
}
//not seen
func thisIsAPrivateFunction() error {
}
Scopes
Universe (language identifiers)
Package
File
Function
Block
Semantics
No pointer arithmetics
No implicit numeric conversions
Array bounds are always checked
types are not type aliases
type X int // X and int are distinct
Interface types
Reflection
Type switch
Concurrency
Go Routines
Channels - Communication Pipes
Concurrency
Light-weight threads of execution
Managed by Go Runtime
Run concurrently with other go routines
Example
Shared resource manager
Querier
DB Reader
etc...
Go Routines
Concurrency
package main
import “fmt”
func myPrinter(str string) {
fmt.Println(str)
}
func main() {
myPrinter(“one”)
go myPrinter(“maybetwo”)
go myPrinter(“maybethree”)
}
//Output
one
maybetwo
Maybethree
//Or
one
maybethree
maybetwo
//Or
one
...
Concurrency
Shared pipes connecting concurrent go routines
Channels
Concurrency
package main
import "fmt”
func main() {
messages := make(chan string)
// Send a value `channel <-`
go func() {
messages <- "ping"
}()
//continued
//continued
// Receive a value `<-channel`
msg := <-messages
fmt.Println(msg)
}
//Output
ping
GC
Easier for Programmer
No overhead of memory allocation and freeing
No explicit memory freeing
Interfaces
Set of methods
Methods on any type
Data types implementing all methods satisfy
Thank You!
SMITA VIJAYAKUMAR
smita@exotel.in

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