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Articles by Mukul Latiyan
Page 27 of 37
While and For Range in Rust Programming
We know that Rust provides a loop keyword to run an infinite loop. But the more traditional way to run loops in any programming language is with either making use of the while loop or the for range loop.While LoopThe while loop is used to execute a code of block until a certain condition evaluates to true. Once the condition becomes false, the loop breaks and anything after the loop is then evaluated. In Rust, it is pretty much the same.ExampleConsider the example shown below:fn main() { let mut z = 1; while z < 20 { ...
Read Morestring.sub() function in Lua
Another important function of the Lua’s string library is the string.sub() function. The string.sub() function is used to extract a piece of the string.The string.sub() function takes three arguments in general, the first argument being the name of the string from which we want to extract a piece, the second argument is the i-th index or say, the starting index of the string piece that we want, and the third and the last argument is the j-th index of the last index of the string piece we want.It should be noted that both the starting index and the ending index, ...
Read MoreHow to check if a file exists in Golang?
In order to check if a particular file exists inside a given directory in Golang, we can use the Stat() and the isNotExists() function that the os package of Go's standard library provides us with.The Stat() function is used to return the file info structure describing the file. Let's first use the Stat() function only and see whether it will be enough to detect the presence of a file in Go.Example 1Consider the code shown below.package main import( "fmt" "os" ) func main() { if _, err := os.Stat("sample.txt"); err == nil { fmt.Printf("File ...
Read MoreFunctional Programming with JavaScript Libraries: Ramda, Lodash, and Immutable.js
Functional programming is a popular paradigm in JavaScript development, emphasising immutability, pure functions, and higher-order functions. It promotes writing clean, concise, and maintainable code. To facilitate advanced functional programming techniques, several JavaScript libraries have emerged, providing powerful tools and utilities. In this article, we will explore three such libraries: Ramda, Lodash, and Immutable.js. We will dive into code examples, explain their features, and showcase the benefits they bring to functional programming in JavaScript. Ramda: Functional Programming made Easy Ramda is a powerful library that promotes functional programming in JavaScript. It focuses on immutability and provides a wide range of functions ...
Read MoreHow to count the number of keys in a Perl hash?
There are times when we would want to know how many key-value pairs are present in a hash. These key-value pair counts are also known as the size of the hash. In Perl, we can find the number of keys in a Perl hash by using the "scalar" keyword or "keys" keyword. In this tutorial, we will explore two Perl examples where we will calculate the number of keys in a hash. Example Consider the code shown below. In this code, we have declared a hash named "countries" and in that hash, we have different countries, each having ...
Read MoreHow to count the number of matches in a Perl string?
In Perl, we can find the number of matches in a string by different approaches. In this tutorial, we will discuss the three most widely used approaches. Searching for a Single Character in a Perl String Let's first take the case where we would want to search for a single character pattern in a string. For example, let's suppose we have a string that look something like this − "India.Japan.Russia.USA.China" And, we want to find the number of times "." (dot) appears in the above string. Example Consider the code shown below. my $countries ...
Read MoreHow to convert binary to decimal and vice versa in Perl?
The conversion between binary to decimal and decimal to binary is a necessity when it comes to dealing with binary data and using them in some simple applications. In Perl, we can convert from decimal to binary and vice versa in multiple ways. In this tutorial, we will explore different examples where we will first convert a decimal value into a binary value and then a binary value into a decimal value. Decimal to Binary in Perl Let's first see an example where we are given two decimal values and we want to convert them to their binary representation. ...
Read MoreHow to convert a string to a number in Perl?
In Perl, we can convert a string into a number by appending the integer value 0 in front of it. There are some other approaches too, which we will discuss in this tutorial with the help of examples. Example Let's first consider the case where the string that we are trying to convert looks something like "123abc" or "23Hzbc". You can see that the it is a mixture of both integer values and characters. Consider the code shown below. my $firstStr = '23ASDF'; print "Convering First String to Number: ", $firstStr + 0; print ""; my $secondStr = ...
Read MoreHow to compare two strings in Perl?
Perl has methods and operators that determine whether two string values are equal or different. In Perl, the compare strings function is essential for comparing two strings and their values. This check examines if two string values are equal or not by using the "eq" and "ne" operators. We can also compare two strings with the help of the "lt, gt, ge, le" operators as well. In this tutorial, we will consider all the approaches that can be used to compare two strings in Perl. The "eq" and "ne" Operators in Perl Let's start with the eq and ...
Read MoreHow to check if a file exists in Perl?
In this tutorial, we will take a couple of examples and demonstrate how you can if a file exists or not, with the help of Perl. Let's suppose we have a simple text file called "sample.txt" with the following data − This is a sample txt file that contains some content inside it. TutorialsPoint is simply amazing! We will use a Perl code to check whether this file exists or not. Example 1 The most basic approach to check whether a file exists or not is to use the "-e" flag and then pass the name of the file. ...
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