JSBasicCode/practise.html at main · mansi-24082006/JSBasicCode · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
<script>
// let a = [10,20,30]
// let arr = a.map((value) => {
//     console.log(value)
//     return value + 1
// })
// console.log(arr)
//######################################## Chapter - 9

//Synchronous programming
// let a = prompt("What is your name:")
// let b = prompt("What is your dreamwork:")
// let c = prompt("What is your Ideal:")
// console.log("My name is " + a  + ". & My Favourite Ideal is  " + c + ". My DreamWork is " + b )

//Asynchronous programming
// console.log("START")
// setTimeout(function(){
//     console.log("Hii This is My site");
// },3000)
// console.log("END");

//CALL BACKS
// document.addEventListener("DOMContentLoaded", function () {
//     function loadScript(src, callback) {
//         var script = document.createElement("script");
//         script.src = src;
//         script.onload = function () {
//             console.log("Loaded script with SRC: " + src);
//             callback(null, src);
//         }
//         script.onerror = function () {
//             console.log("Error loading script with SRC: " + src);
//             callback(new Error("Src got some error "))

//         }
//         document.body.appendChild(script);
//     }
//     function hello(error, src) {
//         if(error){
//             console.log(error)
//             return
//         }
//         alert('Hii! Hello ' + src);
//     }
//     function good(error, src) {
//         if(error){
//             console.log(error)
//             sendEmergencyMessageToCeo();
//             return
//         }
//         alert("Good Morning.." + src);
//     }
//     loadScript("https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js", good);
// });

//Promises......
// let promise = new Promise(function(resolve,reject) {
//     // alert("I am a alert in promise")
//     alert("Hello")
//     resolve(56)
// })
// console.log("Hello!!How Are You?");
// setTimeout(function(){
//     console.log("Hello!! Hii, I am not good ")
// },2000)
// console.log("My name is " + "Hello ....")
// console.log(promise)

//fetch google.com homepage ==> console.log("google.com homepage done")
//fetch data from the data api
//fetch pictures from the server
//print downloading
//Rest of the script

//.then() and .catch()
// let p = new Promise((resolve, reject)=>{
//     setTimeout(()=>{
//         console.log("I am a promise and I am rejected")
//         // resolve(true)
//         reject(new Error("I am a error"))
//     }, 5000)
// })
// console.log(p)
// let p1 = new Promise((resolve, reject)=>{
//     console.log("Promise is pending")
//     setTimeout(()=>{
//         console.log("I am a promise and I am resolved")
//         resolve(true)
//     }, 5000)
// })
// let p2 = new Promise((resolve, reject)=>{
//     console.log("Promise is pending")
//     setTimeout(()=>{
//         console.log("I am a promise and I am rejected")
//         reject(new Error("I am a error"))
//     }, 5000)
// })
// To get the value
// p1.then((value) => {
//     console.log(value)
// })
//To catch the error
// p2.catch((error)=>{
//     console.log("Some Error Occurred in p2");
// })
// p2.then((value) => {
//     console.log(value)
// },(error)=>{
//     console.log(error)
// })
// console.log(p1,p2);
//promise chaining .then() calls
// let p1 = new Promise((resolve, reject) => {
//     setTimeout(() => {
//         console.log("Resolved after 2 seconds")
//         resolve(56)
//     }, 2000)
// })
// p1.then((value) => {
//     console.log(value)
//     return p2 = new Promise((resolve, reject) => {
//         setTimeout(() => { resolve("Promise 2") }, 2000)
//     })
//     // return p2
// }).then((value) => {
//     console.log("We are Done.");
//     return 2
// }).then((value) => {
//     console.log("Now  Done.")
// })
// const loadScript = (src) => {
//     return new Promise((resolve, reject) => {
//         const addScript = () => {
//             let script = document.createElement("script");
//             script.type = "text/javascript";
//             script.src = src;
//             document.body.appendChild(script);
//             script.onload = () => resolve(1);
//             script.onerror = () => reject(0);
//         };
        // Ensure document.body is available before appending
//         if (!document.body) {
//             document.addEventListener("DOMContentLoaded", addScript);
//         } else {
//             addScript();
//         }
//     });
// };
// let p1 = loadScript("https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js");
// p1.then((value) => {
//     console.log("Script loaded successfully:", value);
// }).catch((err) => {
//     console.error("Script failed to load", err);
// });
// let p1 = new Promise((resolve, reject) => {
//     alert("Hey I am resolved")
//     setTimeout(() => {
//         resolve(1);
//     }, 2000)
// })
// p1.then(() =>{
//     // console.log("Congratrulations this promise is resolved");
//     console.log("Hii, I am not good")
//     return new Promise((resolve, reject) => {
//         setTimeout(() => {
//             resolve(4)
//         }, 4000)
//     })
// }).then((value) => { console.log(value)})
// p1.then(()=>{
//     console.log("Mansi")
// })

//Promise Api
// let p1 = new Promise((resolve,reject) => {
//     setTimeout(() => {
//         resolve("value 1");
//     }, 12000);
// });
// let p2 = new Promise((resolve,reject) => {
//     setTimeout(() => {
//         // resolve("value 2");
//         reject(new Error("Error"));
//     }, 2000);
// });
// let p3 = new Promise((resolve,reject) => {
//     setTimeout(() => {
//         resolve("value 3");
//     }, 3000);
// });

// p1.then((value) => {
//     console.log(value);
// });
// p2.then((value) => {
//     console.log(value);
// });
// p3.then((value) => {
//     console.log(value);
// });
// let promise_all = Promise.all([p1,p2,p3])
// let promise_all = Promise.allSettled([p1,p2,p3])
// let promise_all = Promise.race([p1,p2,p3])
// let promise_all = Promise.any([p1,p2,p3])
// let promise_all = Promise.resolve(6)
// let promise_all = Promise.reject(new Error("Hey , I am not good .."))
// promise_all.then((value) => {
//     console.log(value)
// })

//Async/await
// async function Mansi() {
// let suratweather = new Promise((resolve, reject) => {
//     setTimeout(()=> {
//         resolve("30 degree")
//     }, 2000)
// })
// let goaWeather = new Promise((resolve, reject) => {
//     setTimeout(() => {
//         resolve("21 degree")
//     }, 7000)
// })
    // suratweather.then(alert)
    // goaWeather.then(alert)
//     console.log("Fetching surat whether please wait....");
//     let suratW = await suratweather
//     console.log("Fetching surat whether:" + suratW);
//     console.log("Fetching goa whether please wait.....");
//     let goaW = await goaWeather
//     console.log("Fetching goa whether:" + goaW);
//     return [suratW, goaW]
// }
// const body = async () => {
//     console.log("Hii, I am not good nowadays but still try smile..");

// }
// const main =  async () => {
//       console.log("Hello I am not good mood curently..")
//       let a = await  Mansi()
//       let b = await body()
//       // a.then((value) => {
//       //     console.log(value)
//       // })
// }
// main()

//Error Handling : then() and catch() - only on script ne atke nai e mate help kare try catch
setTimeout(() => {
    console.log("Hello please easy way to understaning...")
} , 1000)
try{
    console.log(Mansi)
}
catch(error){
    console.log("Whay always me in every time is my bad time..." + error)
}
setTimeout(() => {
    console.log("Hello please easy way to understaning...")
} , 2000)
setTimeout(() => {
    console.log("Hello please easy way to understaning...")
} , 3000)


</script>
</head>
<body>
</body>
</html>