JAVASCRIPT INTERVIEW QUESTIONS
let a=[];
let b=[];
console.log(a==b);
console.log(a===b);
Ans: false false
2. what is the output:
let a=[1,2,3,4];
console.log(...a);
Ans: 1 2 3 4
3. what is the output:
let a=3;
let b='3';
console.log(a==b);
console.log(a===b);
Ans: true false
4. what is the output:
let a=[1,2,3];
let b=[4,5,6,...a];
console.log(b);
Ans: [4,5,6,1,2,3]
5. what is the output:
console.log(typeof(NaN));
Ans: number
6. what is the output:
let a = 20 - - 20;
console.log(a);
Ans: 40
7.what is the output:
const person ={
name:'guru',
city:'Delhi',
}
console.log(delete person);
Ans: false
8. what is the output:
const arr = ['amit', 'aman', 'shubham'];
const [x, y, z] = arr;
console.log(x);
console.log(y);
console.log(z);
Ans: amit aman shubham
9. what is the output:
const arr = ['amit', 'aman', 'shubham'];
const [x,, z] = arr;
console.log(x);
console.log(z);
Ans: amit shubham
10. what is the output
let person = {
name: 'Rishabh',
surname: 'Sharma'
}
let info = {
city: 'delhi',
country: 'India'
}
person = { ...person, ...info };
console.log(person);
Ans. {
}
11. what is the output
function getData() {
console.log(data);
let data = 'delhi';
}
getData();
Ans:Uncaught ReferenceError: Cannot access 'data' before initialization
12. what is the output:
let data = ['delhi', 'harayana', 'chandigarh'];
delete data[1];
console.log(data);
console.log(data.length);
Ans: ['delhi', empty, 'chandigarh']
3
Reference:https://youtube.com/shorts/ojR34BOHHy0
13.what is the output:
console.log(undefined==null);
Ans. true
14. what is the output:
console.log(undefined===null);
Ans. false
15. what is the output:
console.log(a);
var a;
Ans. undefined
16. what is the output:
let a = 1;
let b = 1;
let c = 2;
console.log(a === b === --c);
Ans.
Comments
Post a Comment