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There are often cases where we would want to perform a particular task after a specific interval of time repeatedly. In Golang, we achieve this with the help of tickers.We can use them with goroutines as well so that we can run these tasks in the background of our application without breaking the flow of the application.The function that we use in tickers is the NewTicker() function which takes time as an argument and we can supply seconds and even milliseconds in it.Example 1The following example demonstrates how we can use a ticker in Golang. Consider the code shown below.package ... Read More
Reflection in Golang is about getting to know the data types of the data that we are dealing with at runtime. There are often certain scenarios where we would want to know the data type of a certain variable that we are getting at runtime or something similar.With the help of reflection, we can extract the type, values and kind of any data type in Golang.In this article, we will explore different third-party functions that are used in reflection.Example 1 – reflect.TypeOf()It is used to return the value of type reflect. In simple words, it is used to know what ... Read More
Before discussing signals and how to handle them, let's talk about a common scenario of creating a signal. A signal can be passed from the terminal, by either terminating the program with the help of CTRL+C or we can by default call the Exit() function that the os package provides us with.Example 1Let's consider an example where we will call the os.Exit() function just after a function declaration that has been deferred.Consider the code shown below.package main import ( "fmt" "os" "time" ) func main() { defer func() { fmt.Println("Inside the ... Read More
Timeouts play an important role when we don't want to wait for the output for some goroutines that are taking more time than what they should take. It should be noted that Go directly doesn't support timeouts, but we can implement them without any difficulty.Let's suppose we have a case where we want to receive some value from a channel ch, but we don't want to wait for more than 3 seconds for the value to arrive. If we get the output after the required 3 seconds, then we want to discard it and print a different message instead of waiting for ... Read More
To check which column has the largest value for each row in an R matrix, we can use apply function.For Example, if we have a matrix called M then we can find column that has the largest value for each row by using the command given below −apply(M,1,which.max)Example 1Consider the matrix given below −M1
In this article, we will see the differences and similarities that are there between a slice that is declared as an empty and a nil slice.Slices in Golang are used to store a sequence of elements. Slices can be expanded at any time and they are declared in the same way as an array, but without their capacity defined.Nil SliceA nil slice is a slice in which while declaring, we simply define the name and the data type and not make use of the built-in make function.A nil slice is a slice that has nil as its zero value and ... Read More
In this article, we will learn what similarities and differences are there between functions and methods in Golang. We will start with each of them separately, and then we will see an example where both of them will be used.Let's start with functions and see what they are and how to use them in Golang.Functions in GolangFunctions in Golang are a block of code that take a few parameters as input and produce some output. If we pass in the same input to a function, it will produce the same output as always.Example 1In this example, we are creating a ... Read More
To find the column index of least value for each row in an R matrix, we can use apply function.For Example, if we have a matrix called M then we can find column that has the least value for each row by using the command as follows −apply(M,1,which.min)Example 1Consider the matrix given below −M1
We can make use of channels if we want to synchronize goroutines. By synchronizing, we want to make the goroutines work in a defined manner, for example, not starting the next goroutine until the previous one has finished its execution.The channels help in achieving that, as they can be used to block the process and then can also be used to notify the second goroutine that the previous goroutine has finished its job.Example 1Let's consider a very basic example of channel synchronization where we will see how we can achieve it with the help of a buffered channel.Consider the code ... Read More
Response status codes are the numbers that we get in response that signify what type of response we received from the server when we asked for something from it.There are different status codes that one gets from the response, and these are mainly divided into five categories.Generally, the status codes are divided into these five classes.1xx (Informational)2xx (Successful)3xx (Redirection)4xx (Client Error)5xx (Server Error)In this article, we will try to get two or more of these status codes.Example 1Let's start with a basic HTTP request to the google.com URL. Once we do that, we will get the response from the server ... Read More