{"id":562,"date":"2022-04-20T10:29:00","date_gmt":"2022-04-20T10:29:00","guid":{"rendered":"https:\/\/andrejacobs.org\/?p=562"},"modified":"2022-04-22T10:31:44","modified_gmt":"2022-04-22T10:31:44","slug":"learning-go-day-4","status":"publish","type":"post","link":"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-4\/","title":{"rendered":"Learning Go &#8211; Day 4"},"content":{"rendered":"\n<p class=\"has-small-font-size\">Featured image by\u00a0<a href=\"https:\/\/github.com\/egonelbre\/gophers\" target=\"_blank\" rel=\"noreferrer noopener\">Egon Elbre<\/a><\/p>\n\n\n\n<div class=\"wp-block-jetpack-markdown\"><ul>\n<li>Continuing to work through <a href=\"https:\/\/golangbot.com\/learn-golang-series\/\">https:\/\/golangbot.com\/learn-golang-series\/<\/a>\n<ul>\n<li>Tutorials 23 to 33.<\/li>\n<\/ul>\n<\/li>\n<li>Continuing to watch some of <a href=\"https:\/\/www.youtube.com\/watch?v=rFejpH_tAHM&amp;list=PLEcwzBXTPUE9V1o8mZdC9tNnRZaTgI-1P\">Golang University 101<\/a>\n<ul>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=PAAkCSZUG1c&amp;list=PLEcwzBXTPUE9V1o8mZdC9tNnRZaTgI-1P&amp;index=5\">Gopherfest 2015 | Go Proverbs with Rob Pike<\/a><\/li>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=zDCKZn4-dck&amp;list=PLEcwzBXTPUE9V1o8mZdC9tNnRZaTgI-1P&amp;index=6\">dotGo 2017 &#8211; Bill Kennedy &#8211; Behavior Of Channels<\/a><\/li>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=5DVV36uqQ4E&amp;list=PLEcwzBXTPUE9V1o8mZdC9tNnRZaTgI-1P&amp;index=7\">GothamGo 2018 &#8211; Things in Go I Never Use by Mat Ryer<\/a><\/li>\n<li><a href=\"https:\/\/www.youtube.com\/watch?v=spKM5CyBwJA&amp;list=PLEcwzBXTPUE9V1o8mZdC9tNnRZaTgI-1P&amp;index=10\">William Kennedy &#8211; Package Oriented Design<\/a><\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h3>Buffered channels<\/h3>\n<ul>\n<li>A buffered channel will only block when the buffer is full. Meaning \u201cproducers\u201d will produce values that are stored in a buffer for consumers to consume and the producer will only block once the buffer is full. Also consumers will only block when the buffer is empty.<\/li>\n<li>Create a buffered channel.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">channel := make(chan type, capacity)\n\nnames := make(chan string, 100)\n<\/code><\/pre>\n<ul>\n<li><a href=\"https:\/\/go.dev\/play\/p\/M-O1eEXq8ww\">Example<\/a> of a producer and consumer.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">package main\n\nimport (\n\t&quot;fmt&quot;\n)\n\nfunc write(ch chan int, capacity int) {\n\tfor i := 0; i &lt; capacity*capacity; i++ {\n\t\tch &lt;- i\n\t\tfmt.Println(&quot;successfully wrote&quot;, i, &quot;to ch&quot;)\n\t}\n\tclose(ch)\n}\n\nfunc main() {\n\tconst capacity = 50\n\tch := make(chan int, capacity)\n\tgo write(ch, capacity)\n\tfor v := range ch {\n\t\tfmt.Println(&quot;read value&quot;, v, &quot;from ch&quot;)\n\t}\n}\n<\/code><\/pre>\n<ul>\n<li>When you close a buffered channel, then receivers can still read values from the channel and once the buffer is empty the zero value of the type will be returned.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">value, stillOpen := &lt;-channel\nif stillOpen == false {\n\/\/ channel was closed and no more values to consume\n}\n<\/code><\/pre>\n<ul>\n<li>Use <code>cap(channel)<\/code> to get the capacity of a channel.<\/li>\n<li>Use <code>len(channel)<\/code> to get the number of values queued in the channel.<\/li>\n<\/ul>\n<h3>WaitGroup<\/h3>\n<ul>\n<li>Used to wait on a collection of goroutines to finish.<\/li>\n<li>Import \u201csync\u201d.<\/li>\n<li>Increment the number of goroutines waiting for by using <code>waitgroupVar.Add(number)<\/code>.<\/li>\n<li>Signal that a goroutine is finished by using <code>waitgroupVar.Done()<\/code>.<\/li>\n<li>Wait until all goroutines are finished by using <code>waitgroupVar.Wait()<\/code>.<\/li>\n<li>See this <a href=\"https:\/\/play.golang.org\/p\/CZNtu8ktQh\">example<\/a>.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">import &quot;sync&quot;\n\nfunc doSomething(wg *sync.WaitGroup) { \/\/&lt;-- Note we are passing a pointer!\n...\n\twg.Done() \/\/ signal this worker is done\n}\n\nvar wg sync.WaitGroup\nwg.Add(2) \/\/ indicate we will wait for 2 workers\ngo doSomething(&amp;wg)\ngo doSomething(&amp;wg)\n\nwg.Wait() \/\/ wait until all workers have .Done()\n\/\/NOTE: You pass the wait group by reference (i.e. pointer) or each\n\/\/ goroutine will get a copy of its own WaitGroup!\n<\/code><\/pre>\n<h3>Select<\/h3>\n<ul>\n<li>Allows you to block and wait for any number of channel send or receive operations. When multiple channels are ready, then a random case will be chosen to process.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">ch1 := make(chan string)\nch2 := make(chan string)\ngo processSomething(ch1)\ngo processSomething(ch2)\n\nselect {\ncase val1 := &lt;- ch1:\n\t\/\/ received from channel 1\ncase val2 := &lt;- ch2:\n\t\/\/ received from channel 2\n}\n<\/code><\/pre>\n<ul>\n<li>You can also add a <code>default<\/code> case that will be called when no other case is ready and thus the select can be non-blocking.<\/li>\n<\/ul>\n<h3>Mutex<\/h3>\n<ul>\n<li>Critical section recap. A critical section is a section of code that must be guaranteed to only be executing on a single thread (e.g. incrementing a counter) at a time and thus prevent a race condition.<\/li>\n<li>Use a mutex to protect a critical section and thus only one goroutine can execute the critical section code.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">import &quot;sync&quot;\n\nvar mutex sync.Mutex\nmutex.Lock()\n... \/\/ critical section\nmutex.Unlock()\n<\/code><\/pre>\n<h3>New<\/h3>\n<ul>\n<li>Go is not OOP in the \u201ctraditional\u201d sense. You don\u2019t have classes and you don\u2019t have constructors.<\/li>\n<li>How do you prevent an instance of a struct to be made where the zero value is not valid. Meaning this is where constructors in other languages come in.<\/li>\n<li>You un-export (e.g. make \u201cprivate\u201d) the type by using camelCase (lowercase initial letter).<\/li>\n<li>You declare an exported function named <code>NewT<\/code> where T is the name of the type you are constructing and returning. Seems to be convention that if only one type is exported from the package then you simply use <code>New<\/code>.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">package person\n\ntype person struct { \/\/&lt;- note the lowercase initial\n...\n}\n\nfunc New(params) person {\n... \/\/ construct and return a valid person\n}\n\n\/\/ ... some other package\np1 := person.New()\n<\/code><\/pre>\n<h3>Defer<\/h3>\n<ul>\n<li>Use <code>defer<\/code> to execute a function\/method call just before the containing function exits.<\/li>\n<li>Arguments passed to the deferred function will be the value at the time the defer call is \u201cscheduled\u201d and not when the deferred function is actually being executed.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">a := 42\ndefer callMeAtTheEnd(a)\na = -200\n\/\/ here the containing function is finished and thus\n\/\/ code execution will look something like this\n\/\/ callMeAtTheEnd(42)\n<\/code><\/pre>\n<ul>\n<li>Multiple defer call can be \u201cscheduled\u201d and a stack is used where the deferred calls are made in LIFO (Last In First Out) order.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">defer one()\ndefer two()\ndefer three()\n\/\/ The order of calls will be\n\/\/ three(), two(), one()\n<\/code><\/pre>\n<h3>Error handling<\/h3>\n<ul>\n<li>Errors are just values. They implement the <code>error<\/code> interface.<\/li>\n<li>Go doesn\u2019t have \u201craise exception\u201d or \u201ctry catch\u201d handling.<\/li>\n<li>When an error is returned from a function, then it is convention to have it as the last type.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">func Open(name string) (file *File, err error)\n\nf, err := Open(&quot;\/something&quot;)\nif err != nil {\n...\n}\n<\/code><\/pre>\n<ul>\n<li>Idiomatic Go is to check the error against <code>nil<\/code>.<\/li>\n<li>The <code>error<\/code> interface looks like this:<\/li>\n<\/ul>\n<pre><code class=\"language-go\">type error interface {  \n    Error() string\n}\n<\/code><\/pre>\n<ul>\n<li>Which means that any type that implements <code>Error() string<\/code> method can be used as an <code>error<\/code>.<\/li>\n<li>Easy to way to create \u201csimple\u201d errors.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">import &quot;errors&quot;\n\nerr := errors.New(&quot;My shiny new error that is just a string&quot;)\n\n\/\/ What if I want a formatted string error?\nimport &quot;fmt&quot;\n\nerr := fmt.Errorf(&quot;Ouch the server returned %d status code&quot;, status)\n<\/code><\/pre>\n<h3>First class functions<\/h3>\n<ul>\n<li>Recap: A first class type means that it can be assigned to variables, passed to functions as arguments and be returned from functions.<\/li>\n<li>In Go functions are first class (meaning can be assigned to a variable, passed to functions and returned from functions).<\/li>\n<li>Anonymous function.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">callMe := func() {\n... \/\/ do something\n}\n\n...\ncallMe()\n\n\/\/ Or to declare and call without assigning to a variable\nfunc() {\n...\n}() \/\/ &lt;- note the () to execute the function\n\n\/\/ Yes you can have arguments\nfunc(name string) {\n...\n}(&quot;Jannie&quot;)\n<\/code><\/pre>\n<ul>\n<li>How do you do \u201ctypealiasing\u201d like I would in Swift to give a closure a type?<\/li>\n<\/ul>\n<pre><code class=\"language-go\">type Handler func(who string, what string) int\n\nvar handler Handler = func(who string, what string) int {\n...\n}\n\nresult := handler(&quot;jannie&quot;, &quot;did something&quot;)\n<\/code><\/pre>\n<ul>\n<li>Higher-order function: A function that takes one or more functions as arguments and that returns a function.<\/li>\n<li>Closures: Functions that capture values from the outside scope.<\/li>\n<\/ul>\n<pre><code class=\"language-go\">a := 42\nfunc() {\n\tfmt.Println(&quot;I am a closure that closes over a = &quot;, a)\n}\n<\/code><\/pre>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>Featured image by\u00a0Egon Elbre [&#8230;]<\/p>\n<p><a class=\"understrap-read-more-link\" href=\"https:\/\/andrejacobs.org\/study-notes\/learning-go-day-4\/\">Read more &rarr;<\/a><\/p>\n","protected":false},"author":2,"featured_media":552,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_mi_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[52],"tags":[53],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v19.13 - 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