JavaScript Question asked in a frontend Interview

Write the code for Infinite Function Currying in JavaScript

multiply(2)(2)(4)(6)(8)()

1. What is Event Propagation in JavaScript?
2. What are the phases of Event Propagation?
3. How can we stop Event Propagation?
4. What is Event Delegation?

Given an integer array nums, move all 0's to the end of it while maintaining the relative order of the non-zero elements.

Input: [0,1,0,3,12]
Output: [1,3,12,0,0]

What will be the output?

var a = 1;
function x(params) {
console.log(a)
if(a) var a = 9;
console.log(a)
}
x(10)

A Teacher of California institute of Technology takes people on yearly trips to museums of science and development for a mind refreshing tour. Total of children depend on their passing percentage and people appearing for the exam. For every section of the museum, the teacher always stands in line and checks if anyone is missing from the queue. All students will be standing in no order in the queue.

Write a code to find the missing child from the queue

Total Students:

Jina, Jeniffer, John, Ronald, Jacob, Joe, Ralph, Surya, Scully, Nina, Scarlet

In Applied science queue standing people

Ronald, Ralph, Scully, Scarlet, Jina, Jeniffer, Joe, Nina, Surya, Jacob

Remove duplicates from a sorted non-decreasing Array

input: [1,2,3,3,4,5,5,6]
output: [1,2,3,4,5,6]

These are some questions I faced in my recent interviews. If you're getting ready for a frontend interview, make sure to review and practice these questions. I'll be sharing more questions over the next few days.

What is the output?

console.log(1);
setTimeout(()=>{console.log('setTimeOut')}, 0);
Promise.resolve().then(()=>{
console.log('P1');
}).then(()=>{
console.log('P2');
}).then(()=>{
console.log('P3');
});
console.log(2);

What is the output?

(function(){
var a = b = 1;
})();
console.log('b', b);
console.log('a', a);

What is the output?

console.log(test3);
console.log(test3());
var test3 = function(){return 3;}