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Articles by Mukul Latiyan
Page 30 of 37
How to handle errors within WaitGroups in Golang?
There are chances that we might get some panic while running multiple goroutines. To deal with such a scenario, we can use a combination of channel and waitgroups to handle the error successfully and not to exit the process.Let's suppose there's a function that when invoked returns a panic, which will automatically kill the execution of the program, as when panic gets called it internally calls os.Exit() function. We want to make sure that this panic doesn't close the program, and for that, we will create a channel that will store the error and then we can use that later ...
Read MoreHow to wait for a goroutine to finish in Golang?
We know that goroutines can be a bit tricky at first, and often we find cases where the main goroutines will exit without giving a chance to the inside goroutines to execute.In order to be able to run the goroutines until the finish, we can either make use of a channel that will act as a blocker or we can use waitGroups that Go's sync package provides us with.Let's first explore a case where we have a single goroutines that we want to finish and then do some other work.Example 1Consider the code shown below.package main import ( "fmt" ...
Read MoreHow to concatenate two slices in Golang?
Whenever we talk about appending elements to a slice, we know that we need to use the append() function that takes a slice as the first argument and the values that we want to append as the next argument.The syntax looks something like this.sl = append(sl, 1)Instead of appending a single number to the slice "sl", we can append multiple values in the same command as well.Consider the snippet shown below.sl = append(sl, 1, 2, 3, 4)The above code will work fine in Go.When it comes to appending a slice to another slice, we need to use the variadic function ...
Read MoreSorting in Golang with sort Package
The standard library of Golang provides a package that we can use if we want to sort arrays, slices, or even custom types. In this article, we will discover three main functions that we can use if we want to sort a slice in Golang. We will also see how we can create a custom sort function and custom comparator.Let's first check how we can sort a slice of integer, float64 and string values.ExampleConsider the code shown below.package main import ( "fmt" "sort" ) func main() { integerSlice := []int{3, 2, 14, 9, 11} sort.Ints(integerSlice) ...
Read MoreHow to use iota in Golang?
Iota in Go is used to represent constant increasing sequences. When repeated in a constant, its value gets incremented after each specification. In this article, we will explore the different ways in which we can use iota in Go.Let's first consider a very basic example, where we will declare multiple constants and use iota.Example 1Consider the code shown belowpackage main import ( "fmt" ) const ( first = iota second = iota third = iota ) func main() { fmt.Println(first, second, third) }OutputIf we run the command go run main.go, then we will get the ...
Read MoreAnonymous goroutines in Golang
In order to be able to understand the anonymous goroutines, we must be aware of the existence of anonymous functions and goroutines. We will first explore the anonymous functions that are the real reason behind the motivation of anonymous goroutines and then we will learn a little about what goroutines are, before finally checking a few examples of anonymous goroutines.Anonymous functionsIn Golang, anonymous functions are those functions that don't have any name. Simply put, anonymous functions don't use any variables as a name when they are declared.We know that we declare a function with a similar syntax as shown below.func ...
Read MoreHow to check if a string contains a substring in Golang?
We know that substrings are a contiguous sequence of characters in a string, and in order to check whether a string contains a substring, we have two options available.The first approach is to use a built-in function called Contains() and the second approach is to make use a self-written logic for the same.The syntax for the Contains() function of the strings package is shown below.func Contains(s, substr string) boolIn the above syntax, there are two parameters inside the function Contains(). The first parameter is the string in which we are trying to find the pattern, and the second is the ...
Read MoreHow to check if a key exists in a map in Golang?
We know that maps in Go contain key-value pairs. There are often instances where we would want to know that a certain key exists in a map or not, in such cases, we have two options available.The first approach is very naive, as in this approach, we basically iterate over the map with the help of the range clause and then compare each key to the key that we want to check if is available or not.And the second approach is a bit better, as we make use of the if statement with a bit of syntactic sugar.Let's first check ...
Read MoreHow to check if a slice contains an element in Golang?
Many languages do provide a method similar to indexOf() where one can find the existence of a particular element in an array-like data structure. However, in Golang, there's no such method and we can simply implement it with the help of a for-range loop.Let's suppose we have a slice of strings, and we want to find out whether a particular string exists in the slice or not.Example 1Consider the code shown below.package main import ( "fmt" ) func Contains(sl []string, name string) bool { for _, value := range sl { if value == name ...
Read MoreNumber Parsing in Golang
Number parsing in Go is about converting the numbers that are present in string form to number form. By number form, we mean that these numbers can either be converted into integers, floats, etc.The most widely used package for number parsing is the "strconv" package that Go library provides us with. There are many cases that are present in the number parsing in Go, we will talk about all of these one by one in this article.The most basic approach is when we have a base 10 number that is actually present in a string form and we want to ...
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