Code Snippets for to write better control loops faster.

Go Code Snippets



The receiver type is inferred to be an interface and the method() method is inferred to take a receiver as its only parameter.

method declaration





This is a function definition. It states that the function init() exists and is to be called when the code is run.

init function



The following code is a function that will be called when the program is executed.

main function

table driven test



The code benchmarks a function by running it multiple times.

benchmark function



This code declares a function called Example and declares the return type to be void.

example function



This code is a function that will be called by the testing package. It will be used to test a function.

test function



The TestMain function will exit the testing.M instance.

test main

 {

defer bar() {

}

}

The code below defines a function that defers two functions. func() will call bar() after it has completed, and the bar() will call func() after it has completed.

defer statement



The following code will initiate a function, and then return immediately. This is known as a function closure.

goroutine anonymous function

 {

defer func() {

}

}()

The defer statement is used to execute a function after another function has been completed.

goroutine function



This code tells the browser to open a port on your computer and listen for requests on that port. When a request comes in, the code will respond with the contents of the http.Request object that was sent.

http ListenAndServe



This code tells the web server to serve requests on port 8080.

http Serve



This code will print out the following on the command line:

InternalServerError: (500) Internal server error

http Error



The code tells the web browser to take the request to the specified URL, but instead of rendering the page, to take the request to the Redirect resource instead. The Redirect resource is responsible for handling the status code and redirecting the browser to the appropriate page. The code uses the http.StatusFound status code to indicate that the requested page was found.

http Redirect



The code above is a function that will be called when the HTTP request arrives. The function will take the http.Request object as input and will write the response back to the request object.

http handler declaration



The code refers to http.HandleFunc("/", handler), which indicates that there is a function named handler that takes one input parameter, which is "/". The code calls this function and passes it the "/" string as input.

http HandleFunc



The code in question will cause an error and the computer will restart.

panic( )



The code creates an instance of the ResponseWriter class and sets it as the value of the r parameter. The http.Request class is then assigned to the r parameter.

http ResponseWriter *Request



Creates a new instance of the given type.

new( )



This code prints the value of var to the screen.

t Logf variable content



This function makes a new type of object. The argument is the new type name.

make( )



This code will not print anything to the console.

t Log



This code prints the value of the variable "var" to the console.

t Logf

log Printf



This code prints the value of the variable var.

log variable content



The code log.Println() prints "nothing" to the console.

log Println

fmt Println

fmt Printf



This code is a conditional statement. The if statement tests a condition, and if it is true, the code inside the curly braces is executed. If the condition is false, the code inside the curly braces is not executed, and the else statement is executed.

if else statement



This code returns "2nil", if there was no error.

if err != nil



The code block will be executed if no other code block matches the given condition.

else branch



interface definition is a type of code that defines the behavior of a class or other type. In this case, the interface defines the behavior of a type that doesn't exist.

empty interface

 else {

The if statement checks the condition. If it is true, the code inside the else block is executed. Otherwise, nothing happens.

if statement

 => type

This code is a modifier for the function `map`. It takes an optional type as a parameter and replaces all occurrences of the given type in the given object with the given type.

map declaration



The code block iterates over the list v and prints each element.

for range statement

 := "channel"

The type variable is set to "channel" in the following code. This setting specifies that the variable will represent a channel object.

channel declaration

for statement



case condition is

In this example, the switch statement is checking the condition to see if it is equal to "true". If it is, the code inside the curly brackets will run. If it is not equal to "true", the code inside the curly brackets will not run.

select statement



switch statement

This code is telling the computer to execute a switch statement if the condition is true. The switch statement has three cases: the first case is when the condition is true, the second is when the condition is false, and the third is when the condition is not true.

case clause



The code block is a conditional statement. The code inside of the curly braces is the code that will be executed if the condition is met.

switch statement

 = "John";

This code declares a variable named name that has the type string.

variable declaration



This code creates a main function in a package. This function will be executed when the program is run.

package main and main function



This is a function definition. The keyword func followed by a period, then () is the function signature. The code between the parentheses is the function body.

function declaration



type name is a type. A type is like a variable, but it's a type, not a value.

type struct declaration



It is declaring a type named name and assigning a function to that type.

type function declaration



The following code declares a type named "name" which implements the "interface" defined earlier. This means that the "name" type can be used to represent an object that implements the "interface" defined earlier.

type interface declaration



The declaration in the code is an enum type, meaning that it defines a set of constants that can be assigned one of a limited number of values. In this case, the enum includes the two constants name and value.

multiple constants



import (

"fmt"
"math"

)


foo := math. Pow ( 2 , 5 )

The code imports the package fmt and the function math. Pow(). It then sets the value of the variable foo to the mathematical operation Pow(2, 5).

multiple imports

;

The const keyword in this code means that the name cannot be changed.

Name	Language	Author	Uses
method declaration	Go	l lucycodes42	1
init function	Go	l lucycodes42	0
main function	Go	l lucycodes42	0
table driven test	Go	l lucycodes42	1
benchmark function	Go	l lucycodes42	5
example function	Go	l lucycodes42	1
test function	Go	l lucycodes42	3
test main	Go	l lucycodes42	1
defer statement	Go	l lucycodes42	2
goroutine anonymous function	Go	l lucycodes42	0
goroutine function	Go	l lucycodes42	2
http ListenAndServe	Go	l lucycodes42	1
http Serve	Go	l lucycodes42	0
http Error	Go	l lucycodes42	0
http Redirect	Go	l lucycodes42	1
http handler declaration	Go	l lucycodes42	2
http HandleFunc	Go	l lucycodes42	1
panic( )	Go	l lucycodes42	0
http ResponseWriter *Request	Go	l lucycodes42	14
new( )	Go	l lucycodes42	1
t Logf variable content	Go	l lucycodes42	0
make( )	Go	l lucycodes42	1
t Log	Go	l lucycodes42	1
t Logf	Go	l lucycodes42	0
log Printf	Go	l lucycodes42	0
log variable content	Go	l lucycodes42	0
log Println	Go	l lucycodes42	0
fmt Println	Go	l lucycodes42	3
fmt Printf	Go	l lucycodes42	1
if else statement	Go	l lucycodes42	0
if err != nil	Go	l lucycodes42	1
else branch	Go	l lucycodes42	0
empty interface	Go	l lucycodes42	0
if statement	Go	l lucycodes42	0
map declaration	Go	l lucycodes42	4
for range statement	Go	l lucycodes42	0
channel declaration	Go	l lucycodes42	5
for statement	Go	l lucycodes42	5
select statement	Go	l lucycodes42	1
case clause	Go	l lucycodes42	1
switch statement	Go	l lucycodes42	2
variable declaration	Go	l lucycodes42	6
package main and main function	Go	l lucycodes42	3
function declaration	Go	l lucycodes42	7
type struct declaration	Go	l lucycodes42	8
type function declaration	Go	l lucycodes42	2
type interface declaration	Go	l lucycodes42	0
multiple constants	Go	l lucycodes42	7
multiple imports	Go	l lucycodes42	0
single constant	Go	l lucycodes42	2

Codiga Snippets, page 38