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nilajcodernilajcoder
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javascript day1
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‎First Program/first.js‎

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console.log("Nilaj");
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console.log("Chakraborty");

‎First Program/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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</body>
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<script src="first.js"></script>
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</html>

‎JavaScript variables data type object.docx‎

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‎Variables/examples.js‎

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//Dynamically typed language need not to mention data type of the variable
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/*
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Variable rules
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1.Case sensitive
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2.Letter digit underscore and $ allowed should be 1st Charecter
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3.reseverd words can not be variables.
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*/
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/*
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Data type in Js
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Number String Boolean Null undefined Symbol Bigint
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*/
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//string
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m="tony";
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console.log(m);
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//int
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a=10;
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console.log(a);
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//float
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b=10.25;
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console.log(b);
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//null
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x=null;
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console.log(x);
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//undefined
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y=undefined;
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console.log(y);
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//boolean
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isfollow=false;
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is=true;
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console.log(isfollow);
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console.log(is);
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$full=5;
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console.log($full);
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z=BigInt("9");
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console.log(z);
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let p=Symbol("hello");
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console.log(p);
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/*
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let var & const
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-----------------
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var: variable can be redeclared & updated. A global scope variable before 2015 we used var
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but in 2015 in javascript has new features called ES6 and we use the following keyword
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let:variable can not be re-declared but can be updated. block scope variable.
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const: variable can not be re-declared or updated.A block scope variable.
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*/
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//var
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var age=25;
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var age=45;
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console.log(age)//45
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//let
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let n=76;
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n=90;
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n=86;
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console.log(n);//86
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//block scope
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{
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let o=89;
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console.log(o);
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}
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{
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let o=54;
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console.log(o);
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}
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//const
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const t=10;
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console.log(t);
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/*
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Object collection of different variables
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*/
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const student={
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fullname:"Nilaj Chakraborty",
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age:26,
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cgpa:9.34,
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ispass:true,
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};
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console.log(student.age);
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const product={
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title:"Ball pen",
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rating:5,
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offer:25,
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price:1200
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};
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console.log(product);
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const profile={
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username:"@nilaj",
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isfollowes:true,
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followers: 100,
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following:120,
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};
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console.log(profile);

‎Variables/index.html‎

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0">
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<title>Document</title>
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</head>
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<body>
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</body>
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<script src="examples.js"></script>
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</html>

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