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Updated Complete Repo Code With Proper detailed comment explanation. #67

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33 changes: 23 additions & 10 deletions 01_basics/01_variables.js
Original file line number Diff line number Diff line change
@@ -1,15 +1,14 @@
const accountId = 144553
let accountEmail = "[email protected]"
var accountPassword = "12345"
accountCity = "Jaipur"
let accountState;
const accountId = 144553;
let accountEmail = "[email protected]";
var accountPassword = "12345";
accountCity = "Jaipur";
let accountState = null;

// accountId = 2 // not allowed


accountEmail = "[email protected]"
accountPassword = "21212121"
accountCity = "Bengaluru"
accountEmail = "[email protected]";
accountPassword = "21212121";
accountCity = "Bengaluru";

console.log(accountId);

Expand All @@ -18,5 +17,19 @@ Prefer not to use var
because of issue in block scope and functional scope
*/

// twitter question
// const arr = [1, 2, 3, 4, 5];
// const slicedArr = arr.slice(1, 2);
// console.log("slicedArr", slicedArr);
// // const ans = arr.splice(1, 2);
// // console.log("splice", ans);
// arr.splice(1, 2, ...slicedArr);
// console.log(arr);

console.table([accountId, accountEmail, accountPassword, accountCity, accountState])
console.table([
accountId,
accountEmail,
accountPassword,
accountCity,
accountState,
]);
17 changes: 7 additions & 10 deletions 01_basics/02_dataTypes.js
Original file line number Diff line number Diff line change
Expand Up @@ -2,28 +2,25 @@

// alert( 3 + 3) // we are using nodejs, not browser

console.log(3
+
3) // code readability should be high
console.log(3 + 3); // code readability should be high

console.log("Hitesh")
console.log("Hitesh");


let name = "hitesh"
let age = 18
let isLoggedIn = false
let name = "hitesh";
let age = 18;
let isLoggedIn = false;
let state;

// number => 2 to power 53
// bigint
// string => ""
// boolean => true/false
// null => standalone value
// undefined =>
// undefined =>
// symbol => unique


// object

console.log(typeof undefined); // undefined
console.log(typeof null); // object
console.log(typeof Object); // function
56 changes: 29 additions & 27 deletions 01_basics/03_conversionOperation.js
Original file line number Diff line number Diff line change
@@ -1,36 +1,38 @@
let score = "hitesh"
let score = "hitesh";

//console.log(typeof score);
//console.log(typeof(score));

let valueInNumber = Number(score)
//console.log(typeof valueInNumber);
//console.log(valueInNumber);
// console.log(typeof score);
// console.log(typeof score);

let valueInNumber = Number(score);
console.log(typeof valueInNumber);
console.log(valueInNumber);

// "33" => 33
// "33abc" => NaN
// "33abc" => NaN //doubt
// true => 1; false => 0
// console.log("33");
// console.log("33abcdef");

let isLoggedIn = "hitesh"
let isLoggedIn = "";

let booleanIsLoggedIn = Boolean(isLoggedIn)
// console.log(booleanIsLoggedIn);
let booleanIsLoggedIn = Boolean(isLoggedIn);
// console.log(booleanIsLoggedIn);
// console.log("33abc"); 33abc

// 1 => true; 0 => false
// "" => false
// "hitesh" => true

let someNumber = 33
let someNumber = 33;

let stringNumber = String(someNumber)
// let stringNumber = String(someNumber);
// console.log(stringNumber);
// console.log(typeof stringNumber);

// *********************** Operations ***********************

let value = 3
let negValue = -value
let value = 3;
let negValue = -value;
// console.log(negValue);

// console.log(2+2);
Expand All @@ -40,29 +42,29 @@ let negValue = -value
// console.log(2/3);
// console.log(2%3);

let str1 = "hello"
let str2 = " hitesh"
let str1 = "hello";
let str2 = " hitesh";

let str3 = str1 + str2
let str3 = str1 + str2;
// console.log(str3);

// console.log("1" + 2);
// console.log(1 + "2");
// console.log("1" + 2 + 2);
// console.log(1 + 2 + "2");
console.log("1" + 2);
console.log(1 + "2");
console.log("1" + 2 + 2);
console.log(1 + 2 + "2");

// console.log( (3 + 4) * 5 % 3);

// console.log(+true);
// console.log(+"");

let num1, num2, num3
let num1, num2, num3;

num1 = num2 = num3 = 2 + 2
num1 = num2 = num3 = 2 + 2;

let gameCounter = 100
let gameCounter = 100;
++gameCounter;
console.log(gameCounter);
// console.log(gameCounter);

// link to study
// https://tc39.es/ecma262/multipage/abstract-operations.html#sec-type-conversion
// https://tc39.es/ecma262/multipage/abstract-operations.html#sec-type-conversion
22 changes: 16 additions & 6 deletions 01_basics/04_comparision.js
Original file line number Diff line number Diff line change
Expand Up @@ -4,18 +4,28 @@
// console.log(2 == 1);
// console.log(2 != 1);


// console.log("2" > 1);
// console.log("02" > 1);

console.log(null > 0);
console.log(null == 0);
console.log(null >= 0);
// console.log(null);
// console.log(0);

//console.log(null > 0);
//In JavaScript, null is a primitive value that represents the absence of an object value. In a numerical context, null is evaluated to 0, so console.log(null > 0) will always evaluate to false.

//console.log(null == 0);
//n JavaScript, console.log(null == 0) logs "false" because null and 0 are not equal. Null is a primitive JavaScript value that represents the intentional absence of an object value. In a numerical context, null is evaluated to 0, but it's treated as falsy for boolean operations.
// console.log(null >= 0);
//https://stackoverflow.com/questions/2910495/why-null-0-null-0-but-not-null-0
// console.log(typeof null);

console.log(undefined);
console.log(undefined == 0);
//n this case, console.log(undefined == 0) might return undefined because the function console.log() returns a value back to the caller, and if a return value is not specified, then the function will return undefined.
console.log(undefined > 0);
//https://stackoverflow.com/questions/24342748/why-does-console-log-say-undefined-and-then-the-correct-value
console.log(undefined < 0);

// ===
// ===

console.log("2" === 2);
// console.log("2" === 2);
40 changes: 22 additions & 18 deletions 01_basics/05_strings.js
Original file line number Diff line number Diff line change
@@ -1,35 +1,39 @@
const name = "hitesh"
const repoCount = 50
const name = "hitesh";
const repoCount = 50;

// console.log(name + repoCount + " Value");

console.log(`Hello my name is ${name} and my repo count is ${repoCount}`);
// console.log(`Hello my name is ${name} and my repo count is ${repoCount}`);

const gameName = new String('hitesh-hc-com')
const gameName = new String("hitesh-hc-com");
console.log(gameName);

// console.log(gameName[0]);
// console.log(gameName.__proto__);


// console.log(gameName.length);
// console.log(gameName.toUpperCase());
console.log(gameName.charAt(2));
console.log(gameName.indexOf('t'));
//console.log(gameName.charAt(2));
//console.log(gameName.indexOf("t"));

const newString = gameName.substring(0, 4);
// console.log(newString);

const newString = gameName.substring(0, 4)
console.log(newString);
const anotherString = gameName.slice(1, 4);
//console.log(anotherString);

const anotherString = gameName.slice(-8, 4)
console.log(anotherString);
// const splicedstring = gameName.splice(1, 4);
// console.log(splicedstring);
//No, the splice() method is not suitable for strings because strings are immutable. The splice() method is a built-in JavaScript method for array objects that lets you add or remove elements from an array, or replace existing elements with new ones. It modifies the original array and returns the removed elements as a new array.

const newStringOne = " hitesh "
console.log(newStringOne);
console.log(newStringOne.trim());
const newStringOne = " hitesh ";
// console.log(newStringOne);
// console.log(newStringOne.trim());

const url = "https://hitesh.com/hitesh%20choudhary"
const url = "https://hitesh.com/hitesh%20choudhary";

console.log(url.replace('%20', '-'))
//console.log(url.replace("%20", "-"));

console.log(url.includes('sundar'))
//console.log(url.includes("sundar"));

console.log(gameName.split('-'));
//console.log(gameName.split("-"));
20 changes: 10 additions & 10 deletions 01_basics/06_nums_and_math.js
Original file line number Diff line number Diff line change
@@ -1,18 +1,18 @@
const score = 400
const score = 400;
// console.log(score);

const balance = new Number(100)
const balance = new Number(100);
// console.log(balance);

// console.log(balance.toString().length);
// console.log(balance.toFixed(1));

const otherNumber = 123.8966
const otherNumber = 123.8966;

// console.log(otherNumber.toPrecision(4));

const hundreds = 1000000
// console.log(hundreds.toLocaleString('en-IN'));
const hundreds = 1000000;
//console.log(hundreds.toLocaleString("en-IN"));

// +++++++++++++ Maths +++++++++++++++++++++++++++++

Expand All @@ -25,10 +25,10 @@ const hundreds = 1000000
// console.log(Math.max(4, 3, 6, 8));

console.log(Math.random());
console.log((Math.random()*10) + 1);
console.log(Math.floor(Math.random()*10) + 1);
console.log(Math.random() * 10 + 1);
console.log(Math.floor(Math.random() * 10) + 1);

const min = 10
const max = 20
const min = 10;
const max = 20;

console.log(Math.floor(Math.random() * (max - min + 1)) + min)
// console.log(Math.floor(Math.random() * (max - min + 1)) + min)
6 changes: 3 additions & 3 deletions 01_basics/07_datesinJs.js
Original file line number Diff line number Diff line change
Expand Up @@ -19,9 +19,9 @@ let myTimeStamp = Date.now()
// console.log(Math.floor(Date.now()/1000));

let newDate = new Date()
console.log(newDate);
console.log(newDate.getMonth() + 1);
console.log(newDate.getDay());
// console.log(newDate);
// console.log(newDate.getMonth() + 1);
// console.log(newDate.getDay());

// `${newDate.getDay()} and the time `

Expand Down
37 changes: 18 additions & 19 deletions 02_basics/01_arrays.js
Original file line number Diff line number Diff line change
@@ -1,39 +1,38 @@
// array

const myArr = [0, 1, 2, 3, 4, 5]
const myHeors = ["shaktiman", "naagraj"]
const myArr = [0, 1, 2, 3, 4, 5];
const myHeors = ["shaktiman", "naagraj"];

const myArr2 = new Array(1, 2, 3, 4)
// console.log(myArr[1]);
const myArr2 = new Array(1, 2, 3, 4);
// console.log(myArr2[1]);

// Array methods

// myArr.push(6)
// myArr.push(7)
// myArr.pop()
// myArr.push(6);
// myArr.push(7);
// myArr.pop();

// myArr.unshift(9)
// myArr.shift()
// myArr.unshift(9);
// myArr.shift();
// console.log(myArr);

// console.log(myArr.includes(9));
// console.log(myArr.indexOf(3));

// const newArr = myArr.join()

// console.log(myArr);
// console.log( newArr);
const newArr = myArr.join("_");

// console.log(typeof myArr);
// console.log(typeof newArr);

// slice, splice

console.log("A ", myArr);

const myn1 = myArr.slice(1, 3)
console.log("A :", myArr);

console.log(myn1);
console.log("B ", myArr);
const myn1 = myArr.slice(1, 3);

// console.log(myn1);
// console.log("B :", myArr);

const myn2 = myArr.splice(1, 3)
const myn2 = myArr.splice(1, 3);
console.log("C ", myArr);
console.log(myn2);
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