https://github.com/sbonami/golang-book

A repository for pulling down and running code samples from book club book
https://github.com/sbonami/golang-book

Last synced: about 2 months ago
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A repository for pulling down and running code samples from book club book

• Host: GitHub
• URL: https://github.com/sbonami/golang-book
• Owner: sbonami
• Created: 2014-01-24T14:13:34.000Z (about 11 years ago)
• Default Branch: master
• Last Pushed: 2014-01-24T01:03:32.000Z (about 11 years ago)
• Last Synced: 2024-10-27T11:14:48.673Z (3 months ago)
• Homepage:
• Size: 65.4 KB
• Stars: 0
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
An Introduction to Programming in Go

====================================

Notes and code sampesl for the first meeting of the Squaremouth book club.

Covering Chapters 1 - 5 of the go lang book.

Chapter Notes

-------------

### Chapter 1

Nothing of note in this chapter.

### Chapter 2 - Your First Program

Finally get to a ["Hello World"](chapter2/hello.go).

Briefly explains packages ("main"), importing, and main.

Some of the simplest types are broken down.

### Chapter 3 - Types

Starts of by explaining types in terms of philosophers and

mathematics (man after my own heart).

#### Integers

* `uint8`, `uint16`, `uint32`, `uint64`,`int8`,`int16`,`int32`,`int64`

* Alias types: `byte` == `uint8` and `rune` == `int32`

* Machine specific: `uint`, `int`, `uintpr`

#### Non-integer Numbers

* `float32` and `float64` (increase in precision with bits).

* `NaN`

* `∞` - (OPTION + 5)

* `complex64` and `complex128`

#### Strings

* Can be created with "" - Single line strings that allow escape characters

* Can be created with `` - Multi-line strings but no escape characters

* `len("String")` - String length

* `"Sample"[0]` - String indexing, does not return what you'd expect

#### Booleans

* `true`, `false` - literals

* `&&`, `||`, `!` - operations

### Chapter 4 - Variables

Now we start looking at how we can declare variables in go. There are a few

different ways to do the same thing.

* `var x int = 8` - declaring and assigning in one line

* `var x int` - only declaring followed by `x = 18` later on

* `x := 8` - assigning and inferring the type

* `const stuff string` - Declaring a constant variable, can't be re-assigned

### Chapter 5 - Control Structures

Can almost write a useful program now.

#### Loops

All loops are written in terms of `for`

* `for stuff == true { ... }` - While loop equivalent

* `for i := 1; i <= 5; i += 2 { ... }` - Traditional for-loop

* Yet to be seen for-each style loop

#### Conditionals

Standard conditionals using real english words.

* `if`, `else if`, `else` - Main conditional statements

* `switch` statement also exists

Discussion Points

-----------------

* Capital lettered function/method names. ex)

  ```go

  fmt.Println("Hello World")

  ```

* The `go` tool and the `godoc` command. Run `go help` to see what it can do.

* Go has a metric ton of types. Is this worth it?

* You can use UTF-8 characters, think about that. Show [gomega](http://onsi.github.io/gomega/).

* Go will not allow you to declare variables that aren't used (_ values)