Go does not support optional function parameters by default. However, there are ways that we will discuss in this article. To pass the optional parameters in Golang, you can use the “struct with optional fields” or “variadic function”. Method 1: Using a struct with optional fields You can pass “optional parameters” to a function using a “struct with … Read more
Here are the four ways to convert a map to a struct in Go. Using “json.Unmarshal()” method Using “mapstructure” Using a “reflect” package Using “for loop” Method 1: Using json.Unmarshal() To convert a Map to Struct in Go, you can use the “json.Marshal()” function and “json.Unmarshal()” functions. Example package main import ( “encoding/json” “fmt” “log” … Read more
To check if a time value is the zero value in Go, you can use the IsZero() of the time.Time type. package main import ( “fmt” “time” ) func main() { var zeroTime time.Time fmt.Println(“Is zero time:”, zeroTime.IsZero()) currentTime := time.Now() fmt.Println(“Is current time zero:”, currentTime.IsZero()) } Output Is zero time: true Is current time … Read more
To assign multiple return value function to new and old variables in Go, you can use the short variable declaration syntax (:=) for new variables and regular assignment (=) for existing ones. The := operator is used to simultaneously declare and assign a variable. Example package main import “fmt” func main() { a, b := … Read more
Golang strconv.IsPrint() function is “used to check whether a given rune is defined as printable.” The print characters include the following: letters numerals punctuation symbols ASCII space Syntax func IsPrint(r rune) bool Parameters r: This is the rune value to be checked. Return value The strconv.IsPrint() function returns a boolean true if the given rune … Read more
Golang strconv.isGraphic() function is “used to check whether the rune is defined as a Graphic by Unicode”. Such characters include letters, marks, numbers, punctuation, symbols, and spaces, from categories L, M, N, P, S, and Zs. “Graphic” means any Unicode rune that is not a control character, not a formatting character, not a surrogate, not … Read more
Golang strconv.Atoi() function is “used to convert string type into int type.” The Atoi() function takes an integer as an argument and returns the string representation of the input value. Syntax func Atoi(s string) (int, error) Parameters string: The Atoi() method takes a string as an argument. Return value It returns an integer or an error … Read more
Golang strconv.FormatComplex() function is “used to convert the complex number c to a string of the form (a+bi) where a and b are the real and imaginary parts, formatted according to the format fmt and precision prec”. Syntax func FormatComplex(c complex128, fmt byte, prec, bitSize int) string Parameters c: It is a complex number to … Read more
Golang os.getenv() method is “used to retrieve an environment variable’s value by the key”. It will return an empty string if the key is not in the environment. An environment variable is a “mechanism for provisioning dynamic configuration information to Unix programs at runtime”. Golang environment variables are global variables set outside of the program … Read more
Golang strconv.CanBackquote() function is “used to check whether the string can be represented unchanged as a single-line backquoted string without control characters other than a tab”. Syntax func CanBackquote(str string) bool Parameters str: It takes one parameter of string type, i.e., str. Return value The CanBackquote() function returns true if the str can be represented … Read more