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Xuebin He
Xuebin He
Golang EMC Dojo
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play.golang.org
github.com/kaleo211/golang-demo
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Origins
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❖ Created at Google in 2007
❖ Open Source in 2009
❖ First stable release in 2012
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❖ C: syntax, control-flow, basic data types, call by value, pointers
❖ Oberon-2: packages, imports, method declarations
❖ Alef: concurrency, channel, garbage collection
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package main
/* #include <stdio.h> #include <stdlib.h>
void myprint(char* s) { printf("%s\n", s); } */ import "C" import "unsafe"
func main() { cs := C.CString("Hello from stdio\n") C.myprint(cs) C.free(unsafe.Pointer(cs)) }
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TIOBE for June 2016
Position Language Ratings
1 Java 20.794%
2 C 12.376%
3 C++ 6.199%
4 Python 3.900%
40 Go 0.209%
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Why Go?
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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“Go provides a model for software construction that
makes dependency analysis easy and avoids much of
the overhead of C-style include files and libraries.”
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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“If you could do Java over again,
what would you change?”
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“The real problem wasn't classes, but rather implementation inheritance.”
“I’d leave out classes.”
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Is-a vs Has-a
Prius is a car that has the ability to run
Peter has the ability to run
Peter is a human that has the ability to run
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Duck Typing
“If it looks like a duck and quacks like a duck, it’s a duck.”
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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Concurrency vs Parallelism
Dealing with things at once Doing things at once
Core0
Core1Core0
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Goroutines vs Thread
The OS schedules threads to run against available processors
Go runtime schedules goroutines to run within a logical processor that is bound to a single OS thread
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Go 1.6.2 (April 2016) 64-bit x86 CPU (A10-7850K 4GHz) | Number of goroutines: 100,000 | Per goroutine: | Memory: 4707.92 bytes | Time: 1.842097 µs
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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Pass by Value vs Pass by Reference
Performance
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Pointer Arithmetic
Memory allocation
Segment Error
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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60+ companies
3,000,000 lines
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VS
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go fmt
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Fast Compilation Easy for OOP
Built-in Concurrency Pass by Reference
Readability Dependency Management
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gocode├── bin├── pkg└── src ├── github.com │ ├── Sirupsen │ │ └── logrus │ ├── kaleo211 │ │ └── golang-demo │ └── kisielk │ ├── errcheck │ └── gotool └── golang.org └── x ├── net └── oauth2
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go get github.com/kaleo211/golang-demo
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