Understanding defer in Go. Deferred Function Calls A defer statement is an ordinary function or method call prefixed by the keyword defer. The function and argument expressions are evaluated when the statement is executed, but the actual call is def...

Variadic Functions Tutorial with Examples in Go. Variadic Function A variadic function is one that can be called with varying numbers of arguments. The most familiar examples are fmt.Printf and its variants. package main import "fmt" func add(v...

Closures and Anonymous Functions in Go. Anonymous Function A function literal is written like a function declaration, but without a name following the func keyword. It is an expression, and its value is called an anonymous function. package main ...

Golang path and filepath Examples. Using filepath.Base The number is the index of the last slash in the string. If you want to get the file's base name, use filepath.Base: package main import ( "fmt" "path/filepath" ) func main() { path ...

Understanding Rune in Go. UTF-8 Decoder The unicode/utf8 package provides one that we can use like this: package main import ( "fmt" "unicode/utf8" ) func main() { s := "Hello, 世界" for i := 0; i < len(s); { r, size := utf8.DecodeR...

An example program using numbers. Integers And Floating Point Numbers Go has several different types to represent numbers. Generally we split numbers into two different kinds: integers and floating-point numbers. Make a main.go file containing the ...

In Python, there are 2 ways to make a list of alphabet characters. Using string Module The string.ascii_lowercase is a pre-initialized string used as string constant. In Python, string ascii_lowercase will give the lowercase letters ‘abcdefghijklmno...

In Python, using the uniform function is the easiest way to get a random number between a float range. Using uniform Method The random.uniform(a, b) method returns a random floating point number N such that a

In Python, there are 2 ways to extract all the numbers contained in a string. Using List Comprehension List comprehensions provide a concise way to create lists. If you only want to extract only positive integers, try the following: #!/usr/bin/...

In Python, using the timedelta object is the easiest way to calculate number of days between two given dates. Using timedelta If you have two date objects, you can just subtract them, which computes a timedelta object. In this program, we will cal...

In Python, there are 2 ways to find out the number of CPUs. Using multiprocessing Module The multiprocessing.cpu_count() method returns the number of CPUs in the system. For example, #!/usr/bin/python3 # Import module import multiprocessing c...

In Python, there are 3 ways to get current time in milliseconds. Using time Method The time.time() method returns the time in seconds since the epoch as a floating point number. For example, #!/usr/bin/python3 # Import module import time ms =...

In Golang, there are 2 ways to check if a file is a valid image. Using DetectContentType Function The http.DetectContentType() function implements the algorithm described at https://mimesniff.spec.whatwg.org/ to determine the Content-Type of the gi...

In Golang, there are 2 ways to count characters in a string. Using RuneCountInString Function Straight forward natively use the utf8.RuneCountInString() The following example should cover whatever you are trying to do: package main import ( ...

In Rust, there are 2 ways to convert float to integer. Using as Keyword Executing an as expression casts the value on the left-hand side to the type on the right-hand side. An example of an as expression: fn main() { let a = 3.6415_f64; l...