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amreshproamreshpro
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js explore
1 parent c7dcf1e commit 2b498e8

34 files changed

Lines changed: 546 additions & 223 deletions

‎1_part/conditions.js‎

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// if-else
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const isAdmin = true;
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if(isAdmin){
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console.log("You are admin")
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}else{
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console.log("Only admin can access")
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}
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‎1_part/datatype.js‎

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typeof undefined; // "undefined"
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typeof 0; // "number"
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typeof 10n; // "bigint"
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typeof true; // "boolean"
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typeof "foo"; // "string"
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typeof Symbol("id"); // "symbol"
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typeof Math; // "object" (1)
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typeof null; // "object" (2)
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typeof alert; // "function" (3)
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console.log(typeof alert)

‎1_part/function.js‎

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// functions
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function greet(name) {
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return `Hello, ${name}!`;
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}
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console.log(greet("Amresh"));
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// function expression
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const greet2 = function (name) {
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return `Hello, ${name}!`;
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};
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console.log(greet2("Amresh")); // Outputs: Hello, Amresh!
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// arrow functions
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const greet = (name) => `Hello, ${name}!`;
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console.log(greet("Amresh")); // Outputs: Hello, Amresh!
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// anonymous function
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setTimeout(function () {
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console.log("This will run after 2 seconds");
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}, 2000);
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// IIFE
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(function () {
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console.log("This function runs immediately!");
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})();
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// Constructor Function
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function Person(name, age) {
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this.name = name;
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this.age = age;
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}
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const person1 = new Person("Amresh", 25);
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console.log(person1.name); // Outputs: Amresh
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// Generator Function
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// Generator functions return an iterator object that can be used to control the execution of the function, allowing you to pause and resume execution.
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function* generateNumbers() {
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yield 1;
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yield 2;
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yield 3;
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}
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const generator = generateNumbers();
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console.log(generator.next().value); // Outputs: 1
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console.log(generator.next().value); // Outputs: 2
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console.log(generator.next().value); // Outputs: 3
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// HOF(Higher Order Function)
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// A higher-order function is a function that takes another function as an argument or returns a function.
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function higherOrder(fn) {
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return fn();
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}
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const greet3 = () => "Hello!";
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console.log(higherOrder(greet3)); // Outputs: Hello!
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// Callback Function
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// A callback function is a function passed as an argument to another function and is executed after some operation has been completed.
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function processUserInput(callback) {
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const name = "Amresh";
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callback(name);
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}
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processUserInput(function (name) {
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console.log(`Hello, ${name}!`); // Outputs: Hello, Amresh!
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});

‎1_part/input.js‎

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let age = parseInt(prompt("enter age: "))
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console.log("Your Age: ",age)

‎1_part/loops.js‎

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// loop
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let arr = ["A","M","R","E","S","H"]
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// for loop
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for (let index = 0; index < arr.length; index++) {
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console.log(arr[index])
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}
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let i = 0;
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while(i<arr.length){
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console.log(arr[i])
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i++;
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}
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// do while
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let j = 0;
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do {
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console.log(j);
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j++;
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} while (j < 5);
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// for in loop
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// for (variable in object) {
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// // code to be executed
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// }
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for(let char in arr){
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console.log(char)
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}
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// for of loop
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// for (variable of iterable) {
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// code to be executed
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// }
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const person = { name: "Amresh", age: 25, city: "Delhi" };
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for (let key in person) {
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console.log(key + ": " + person[key]);
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// Outputs: name: Amresh, age: 25, city: Delhi
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}
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let str = "JavaScript";
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for (let char of str) {
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console.log(char); // Outputs each character of the string: 'J', 'a', 'v', etc.
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}
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// method loop - forEach
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arr.forEach(function(element, index, array) {
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// code to be executed
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console.log(index+1,". ",element)
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});
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// method - map loop
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arr.map((item)=>{
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console.log(item)
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})

‎1_part/operator.js‎

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// Operators
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// AND ( & )
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// OR ( | )
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// XOR ( ^ )
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// NOT ( ~ )
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// LEFT SHIFT ( << )
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// RIGHT SHIFT ( >> )
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// ZERO-FILL RIGHT SHIFT ( >>> )
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// typeof: Returns the type of a variable.
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// instanceof: Checks if an object is an instance of a class.
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const arr = [1, 3, 4];
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console.log(arr instanceof Array); // true
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console.log("Hello" + 5); // hello5
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console.log(3 + 7); //10
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console.log(1 / 0); // Inifinty
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console.log(5 / 2); //2.5
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console.log(8 % 3); // 2
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console.log(1.2 == 1 + 0.2); //true
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console.log(1.2 === 1 + 0.2); //true
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console.log(0 != 0); //false
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console.log(-Infinity < Infinity); //true

‎1_part/string.js‎

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// string
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// 3 ways
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// 1. '' single quote
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// 2. "" double quote
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// 3. `` backticks
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console.log("---- ---- ----");
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const PORT = "8080";
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const DB = "MYSQL";
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const URI = `http://localhost:${PORT}`;
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console.log(URI);
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console.log("---- ---- ----");
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let name = "IllyaRaja";
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console.log(`hello ${1}`); // 1
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console.log(`hello ${"name"}`); // name
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console.log(`hello ${name}`); // IllyaRaja
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console.log("---- ---- ----");
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‎1_part/switch.js‎

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// switch
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let char = prompt("enter char");
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switch (char) {
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case "a" || "A":
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console.log("vowel " + char);
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break;
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case "e" || "E":
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console.log("vowel " + char);
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break;
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case "i" || "I":
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console.log("vowel " + char);
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break;
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case "o" || "O":
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console.log("vowel " + char);
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break;
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case "u" || "U":
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console.log("vowel " + char);
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break;
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default:
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console.log("consonent " + char);
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}

‎1_part/variable.js‎

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// variables
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// 3 keyword
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// 1.var (old way not recommended)
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// 2.let
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// 3.const
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var planet ="earth"
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let name = "Amresh";
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const PI=3.14
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console.log(planet)
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console.log(name)
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console.log(PI)
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// let and const can't be declared twice.

‎2_part/arrays.js‎

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// arrays
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const fruits = ["apple", "banana", "cherry"];
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const numbers = new Array(1, 2, 3);
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//empty array
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const emptyArray = new Array();
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const lengthArray = new Array(5); // Creates an empty array of length 5
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console.log(fruits[0]); // Outputs: 'apple'
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console.log(fruits[2]); // Outputs: 'm
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const moreFruits = ["pineapple", "berry"];
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const allFruits = fruits.concat(moreFruits);
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console.log(allFruits); // Outputs: ['kiwi', 'orange', 'mango', 'pineapple', 'berry']
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fruits.forEach((fruit) => {
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console.log(fruit);
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});
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// Outputs: 'kiwi', 'lemon', 'orange', 'mango'
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const shortFruits = fruits.filter((fruit) => fruit.length < 6);
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console.log(shortFruits); // Outputs: ['kiwi', 'lemon', 'mango']
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const found = fruits.find((fruit) => fruit.startsWith("m"));
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console.log(found); // Outputs: 'mango'
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const numbers2 = [1, 2, 3, 4];
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const sum = numbers2.reduce((total, num) => total + num, 0);
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console.log(sum); // Outputs: 10
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fruits.sort();
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console.log(fruits); // Outputs: ['kiwi', 'lemon', 'mango', 'orange']
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const numbers3 = [40, 100, 1, 5];
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numbers3.sort((a, b) => a - b);
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console.log(numbers3); // Outputs: [1, 5, 40, 100]
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