Aurelie  Block

Aurelie Block

1595205597

Using While and Do While Loops in JavaScript

Automation is the technique of making a technique or system operate automatically; in programming, we use loops to automate repitious tasks. Loops are one of the most useful features of programming languages, and in this this article we will learn about the while and do...while loops in JavaScript.

The while and do...while statements in JavaScript are similar to conditional statements, which are blocks of code that will execute if a specified condition results in true. Unlike an if statement, which only evaluates once, a loop will run multiple times until the condition no longer evaluates to true.

Another common type of loop you will encounter is the [**for**](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/for)** statement**, which executes a set number of times. while and do...while loops are conditionally based, and therefore it is not necessary to know beforehand how many times the loop will run.

While

In JavaScript, a while statement is a loop that executes as long as the specified condition evaluates to true. The syntax is very similar to an if statement, as seen below.

while (condition) {
  // execute code as long as condition is true
}

The while statement is the simplest loop to construct in JavaScript.

For an example, we will pretend we have an aquarium that has a population limit. For each iteration of the loop, we will add one fish. Once the aquarium has 10 fish, the population limit will be reached, and the program will cease to add more fish.

Without a loop, we might have to write:

aquarium.js

// Start off with 0 fish
let fish = 0;

fish++
}

aquarium.js

// Set population limit of aquarium to 10
const populationLimit = 10

// Start off with 0 fish
let fish = 0

// Initiate while loop to run until fish reaches population limit
while (fish < populationLimit) {
  // add one fish for each iteration
  fish++
  console.log(
    'The aquarium has room for ' + (populationLimit - fish) + ' more fish.'
  )
}

#javascript #fundamentals

What is GEEK

Buddha Community

Using While and Do While Loops in JavaScript
Lowa Alice

Lowa Alice

1624406400

JavaScript Loops Tutorial

JavaScript loops made simple.

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The origin of the article: https://www.youtube.com/watch?v=s9wW2PpJsmQ&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=8
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#javascript #loops #javascript loops #javascript loops tutorial

CSS Boss

CSS Boss

1606912089

How to create a calculator using javascript - Pure JS tutorials |Web Tutorials

In this video I will tell you How to create a calculator using javascript very easily.

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Ida  Nader

Ida Nader

1599099600

How to Use If-Else Statements and Loops in R – Dataquest

When we’re programming in R (or any other language, for that matter), we often want to control when and how particular parts of our code are executed. We can do that using control structures like if-else statements, for loops, and while loops.

Control structures are blocks of code that determine how other sections of code are executed based on specified parameters. You can think of these as a bit like the instructions a parent might give a child before leaving the house:

“If I’m not home by 8pm, make yourself dinner.”

Control structures set a condition and tell R what to do when that condition is met or not met. And unlike some kids, R will always do what we tell it to! You can learn more about control structures in the R documentation if you would like.

In this tutorial, we assume you’re familiar with basic data structures, and arithmetic operations in R.

Not quite there yet? Check out our Introductory R Programming course that’s part of our Data Analyst in R path. It’s free to start learning, there are no prerequisites, and there’s nothing to install — you can start learning in your browser right now.

install.packages(“Dataquest”)

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(This tutorial is based on our intermediate R programming course, so check that out as well! It’s interactive and will allow you to write and run code right in your browser.)

Comparison Operators in R

In order to use control structures, we need to create statements that will turn out to be either TRUE or FALSE. In the kids example above, the statement “It’s 8pm. Are my parents home yet?” yields TRUE (“Yes”) or FALSE (“No”). In R, the most fundamental way to evaluate something as TRUE or FALSE is through comparison operators.

Below are six essential comparison operators for working with control structures in R:

  • == means equality. The statement x == a framed as a question means “Does the value of x equal the value of a?”
  • != means “not equal”. The statement x == b means “Does the value of x not equal the value of b?”
  • < means “less than”. The statement x < c means “Is the value of x less than the value of c?”
  • <= means “less than or equal”. The statement x <= d means “Is the value of x less or equal to the value of d?”
  • > means “greater than”. The statement x > e means “Is the value of x greater than the value of e?”
  • >= means “greater than or equal”. The statement x >= f means “Is the value of xgreater than or equal to the value of f?”

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Rahul Jangid

1622207074

What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

  • For single line comment in JavaScript we have to use // (double slashes)
  • For multiple line comments we have to use / * – – * /
<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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