JS questions

questions.js

//Q1
console.log(typeof typeof 2); //?

//Q2 
console.log(1+2+3+'1'); //?

//Q3
console.log(1+[]+1+{}) //?

//Q4
console.log(!1+!2); //?

//Q5
var n = 10,
	obj1 = {
		value: 'first val'
	},
	obj2 = {
		value: 'second val'
	},
	obj3 = obj2;

	function trans(n, obj1, obj2) {
		n = n*10,
		obj3 = obj1;

		obj1 = obj2;
		obj2.value = 'third value';
	}
	
	trans(n, obj2, obj1);

	console.log( n ) //?
	console.log(obj1.value) //?
	console.log(obj2.value) //?
	console.log(obj3.value) //?

//Q6
var a = [1, 2];
	b = [3, 4];

	Array.prototype.push.call(a, b);

	console.log(a) //?
	console.log(b) //?

//Q7 
function count(count) {
	var res = []
	for (var i = 0; i < count; i++) {
		res.push(function() { console.log(i) })
	}
	return res
}
console.log(count(5)[2]()) //?

//Q8 - write calc fn
calc(2, 5) //result 7
calc(2)(5) //result 7

//Q9
function fn(a,b,c,d,e) { return console.log(arguments.length) }
console.log(fn(1, undefined,3,undefined)) //??

//Q10
var a = 2;
function a(b) { return b };
console.log(a); //??

//Q11 - write a sequence of numbers
function showMe() {
	console.log('1');
	setTimeout(function(){console.log('2');}, 0)
	console.log('3');
	setTimeout(function(){console.log('4');}, 0)
	console.log('5');
} 
showMe();

//Q12 - write searchEqual names fn
var cities = ['london', 'donlon', 'tokio', 'moscow', 'paris', 'iokto', 'stpetersburg']
searchEqual(cicites);
//true result
[
	['london', 'donlon'],
	'moscow',
	'paris',
	['tokio', 'iokto'],
	'stpetersburg'
]

//Q13 write isPalindrom fn
isPalindrom('око') //true
isPalindrom('окунь')//false
isPalindrom('Аргентина манит негра') //true
isPalindrom('Madam, I’m Adam') //true

//Q14 write reverseString fn for any strings
'nodnol'.reverseString(); //London

//Q15 write greyscale fn
greyScale('#ffcc00'); //#999999
greyScale('#00baff'); //#939393

//Q16 write sleep fn
demo();

async function demo() {
    console.log("Hello!");
    await sleep(1000);
    console.log("1 second after start");    
    await sleep(2000);
    console.log("3 second after start"); 
}

function sleep() { 
//write here 
}

//Q17
var a={},
    b={key:'b'},
    c={key:'c'};

a[b]=123;
a[c]=456;

console.log(a[b]); //?

//Q18
var y = 1;
  if (function f(){}) {
    y += typeof f;
  }
  console.log(y); //?

//Q19
var output = (function(x){
    delete x;
    return x;
  })(0);
  
console.log(output); //?

//Q20
var Employee = {
  company: '8bit'
}
var emp1 = Object.create(Employee);
delete emp1.company

console.log(emp1.company); //?