Javascript Question & Answer Practice

Javascript Practice – Questions & Answers

Beginner Level

Q46. Get element by ID.

document.getElementById("box");

Q47. Change text content.

element.textContent = "Hello";

Q48. Alert message.

alert("Welcome");

Q49. Prompt input.

prompt("Enter name");

Q50. Confirm box.

confirm("Are you sure?");

Q51. Local storage set.

localStorage.setItem("user","Vijay");

Q52. Local storage get.

localStorage.getItem("user");

Q53. Ternary operator.

age>18 ? "Yes":"No";

Q54. Default parameter.

function test(x=10){
  return x;
}

Q55. Spread operator.

let arr2 = [...arr];

Q56. Destructuring.

let {name,age} = user;

Q57. Optional chaining.

user?.address?.city;

Q58. Nullish coalescing.

let x = val ?? 10;

Q59. Web storage types.

LocalStorage & SessionStorage

Q60. JS best practice.

Use ES6+, modular code, async handling.