Noah Saunders

Noah Saunders

1575272592

Why you don't need Loops in JavaScript?

Learn how to remove loops and use higher-order functions like map, reduce, and filter

Why Are We Replacing Loops?

Using higher-order functions will make your code :

  • More readable.
  • Easy to understand.
  • Easy to debug.

1. To Loop Through All Elements and Perform an Action

Using loop:

function print(name) {
   console.log(name);
}var names = ["Jack", "Jecci", "Ram", "Tom"];for(let i=0, totalNames = names.length; i< totalNames ; i= i +1) {
    print(names[i])
}

Without loop:

var names = ["Jack", "Jecci", "Ram", "Tom"];

names.map(name => print(name));

// we can shrink the above code as

names.map(print);

2. Filtering Array

Using normal for loop:

function isOdd(n) {
   return n %2;
}var numbers = [1,2,3,4,5];var odd = [];for(let i=0, total = numbers.length; i< total ; i= i +1) {   let number = numbers[i];
   if( isOdd(number) ) {
      odd.push(number);
   }}

Using filter:

var numbers = [1,2,3,4,5, 6, 7]

var odd = numbers.filter(n => n%2); // single line

3. Creating an Output With Array Elements

Sum of numbers:

var numbers = [1,2,3,4,5]
var result = 0;
for(let i=0, total = numbers.length; i< total ; i= i +1) {   
            result = result + numbers[i];
}

Using reduce:

var numbers = [1,2,3,4,5,6,7];function sum(accumulator, currentValue){
   return accumulator + currentValue;
}var initialVal = 0;
var result = numbers.reduce(sum, initialVal);

The above code can be even more simplified:

var numbers = [1,2,3,4,5,6,7, 10];
var result = numbers.reduce((acc, val)=> acc+val, 0);

4. Checking if an Array Contains a Value

var names = ["ram", "raj", "rahul"];for(let i=0, totalNames = names.length; i< totalNames ; i= i +1) {
   if(names[i] === "rahul") {
     console.log("%c found rahul", "color:red");
     return; 
   }
}

Using some:

var names = ["ram", "raj", "rahul"];
let isRahulPresent = names.some(name => name==="rahul");
if(isRahulPresent) {
  console.log("%c found rahul", "color:red"); 
}

%c in the console statement will apply style to the console text.

5. To Check Whether Every Element in an Array Meets a Condition

Using for loop:

var num = [1,2,3,4,5, 0];for(let i=0, total = numbers.length; i< total ; i= i +1) {    
			if(num <= 0) {      
			break;
      console.log("0 present in array");
    }
}

Using every:

var num = [1,2,3,4,5, 0];

var isZeroFree = num.every(e => e > 0);

if(!isZeroFree) {
    console.log("0 present in array");
}

Thanks for reading. I hope you like this.

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Buddha Community

Why you don't need 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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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#javascript #loops #javascript loops #javascript loops tutorial

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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Niraj Kafle

1589255577

The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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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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