console.log("Q1")
const student = { name: "David Rayy", sclass: "VI",rollno:12};
let arr = [];
for (let st in student) {
arr.push(st);
}
console.log(arr.join(","));
/-----------------------------------------------------------------/;
console.log("Q2")
const student2 = { name: "David Rayy", sclass: "VI",rollno:12};
delete student2.rollno;
console.log(student2);
/-----------------------------------------------------------------/;
console.log("Q3")
let count = 0
for (let i in student)
count++;
console.log(count);
/-----------------------------------------------------------------/;
console.log("Q4")
const library = [ { author: "Bill Gates", title: "The Road Ahead", readingStatus: true }, { author: "Steve Jobs", title: "Walter Isaacson", readingStatus: true }, { author: "Suzanne Collins", title: "Mockingjay: The Final Book of The Hunger Games", readingStatus: false, }, ];
for (book of library) {
console.log("book -",book.title,"\n reading status -",book.readingStatus);
}
/-----------------------------------------------------------------/;
console.log("Q5") const cylinder = { rad: 0, height: 0, volume() {
return ((22 / 7) * this.rad * this.rad * this.height).toFixed(4); }, };
cylinder.rad = 20; cylinder.height = 100;
console.log(cylinder.volume());
/-----------------------------------------------------------------/;
console.log("Q6")
const library2 = [ { title: "The Road Ahead", author: "Bill Gates", libraryID: 1254 }, { title: "Walter Isaacson", author: "Steve Jobs", libraryID: 4264 }, { title: "Mockingjay: The Final Book of The Hunger Games", author: "Suzanne Collins", libraryID: 3245, }, title: "Mockingjay: The Final Book of The Hunger Games", author: "Suzanne Collins", libraryID: 9999, }, ];
library2.sort((a, b) => b.libraryID - a.libraryID);
console.log(library2);