10 fun things you can do with just a few lines of JavaScript

In this tutorial, let’s discuss some interesting things you can do with a few lines of Javascript.

Almost every website uses JavaScript. JavaScript was born in 1995. It is a programming language similar to other languages, but it runs faster because it does not have many predefined functions.

JavaScript can create programs, libraries, and scripts for websites or desktop applications. Many web developers are also good at writing JavaScript. Some JavaScript code can be interesting if you look at how it behaves. Let’s discuss what these fascinating things are in JavaScript.

Interesting things about semicolons

A semicolon is included at the end of a statement in a programming language. However, unlike other languages, JavaScript also uses a semicolon to start code. Don't follow this wrong approach.

;var x = 5

Interesting things about NaN

In JavaScript, anything that is not a number is also a valid number. An example is "NaN" (not a number).

Interesting things about Null

null is an object that does not represent anything. If you use the typeof function, you will get information about null objects.

Interesting things about this function

Functions can run on their own, just like in other programming languages. When you call the following function, "hi"

will be displayed on the screen

(function(){alert(‘hi’);})(); //gives ‘hi’ alert

Interesting things about script tags

Scripts can only have one source file. This file must be in the same directory as the script tag. No other files or code can be included in the script tag. The following is not possible in JavaScript.

<script src="code.js">
   alert("Hi");
</script>

The fascinating thing about adding two different types of values

Add a string and a number to get a string. Adding a number to a string results in a number.

"100" + 2;//prints "1002"
100 + "2";//prints 102
alert("4"/"2"); //2
alert(2 + "3"); //23
alert("4" + 5); //45
alert("8" + 3 + 7); //837
alert(3 + 1 + "5"); // 45

Interesting things about IIFE,

In an immediate call function expression, we can expect different results as shown below.

//code runs as it is an assignment
var test = function () {

   //code
}();

// Syntax error as it is only a definition
function test() {

   //code
}();

Interesting things about undefined

Although "undefined" is a keyword in JavaScript, it has no specific meaning. A variable can have a special meaning called undefined, or it can be undefined. If a variable is undefined, you can't figure out what it is.

var vb;
alert(vb== undefined); //returns true

undefined = "value";
var vr;
alert(vr == undefined); //returns false

Interesting things about brackets

Bracket positions will define different functions.

function a() {
   return
   {
      x: '1'
   }
}
function b() {
   return {
      x: '1'
   }
}
console.log(typeof a() === typeof b()); //returns false

Interesting things about numbers

Observe the following output.

alert(9999999999999999); //10000000000000000

let x= -0; // -0
let y= 0; // 0

This tutorial discusses some of the interesting things you can do with a few lines of JavaScript. If you are a JavaScript developer, you will be familiar with all of this. However, some of them are inherently wrong.

We can do a lot of cool things with JavaScript without coding. JavaScript has changed a lot over the years. Make websites that can move and games that can be controlled from a computer. You can also make mobile apps and programs that run on your computer without the help of software.

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