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Q.1 What will be the output of below code?

var a;
alert(typeof(typeof a)); 
// string

Because typeof a store ‘’undefined’ as string.

Q.2 What will be the output of below code?

let obj = {
key:2,
value:6
};
let output = {...obj};
output.value-= obj.key;
console.log(output.value);
// 4

Q.3 What will be the output of below code?

let p = 10;
if(p === 10){
let p = 20;
}
console.log(p)

// 10

Q.4 What will be the output of below code?

const que = (x,y,z) => {
return x, y, z;
}
console.log(que(4,5,6))

//6

Q.5 What will be the output of below code?

let x = 6;
let y = 10;
let r = x++ + ++y - 4;
console.log(r)
// 13

Q.6 What will be the output of below code?

var name = “The Tech Genics”;
(function(){
console.log(name);
var name = “The Tech Genics”;
}

// undefined

Q.7 What will be the output of below code?

var x = 1;
if (function test (){}){
x += typeof test;
}

console.log(x);
// 1 undefined

Q.8 What will be the output of below code?

var result = '5' -2+'3';
console.log(result);

//33

Q.9 What will be the output of below code?

console.log((0.2+ 0.1) === 0.3);

//false

Q.10 What will be the output of below code?

var arr = [];
var v2 = arr.push(2);
console.log(v2) 
// 1