Javascript Data Types MCQ - Quiz

What is the result of the following code? 
var x = true;
var y = false;
console.log(x && y);

  • Atrue
  • Bfalse
  • C"false"
  • D"true"

What is the result of the following code? 
var num = 10;
num++;
console.log(num);

  • A10
  • B11
  • C"10"
  • D"11"

What is the result of the following code? 
var num1 = 10;
var num2 = "20";
console.log(num1 + num2);

  • A30
  • B"30"
  • C"1020"
  • DTypeError

What is the result of the following code? 
var map = new Map();
map.set(1, "one");
map.set(2, "two");
console.log(map.size);

  • A1
  • B2
  • C6
  • D8

What is the result of the following code? 
var set = new Set();
set.add(1);
set.add(2);
console.log(set.has(2));

  • Atrue
  • Bfalse
  • C"true"
  • D"false"

What is the result of the following code? 
var obj = {};
console.log(Object.is(obj, {}));

  • Atrue
  • Bfalse
  • C"true"
  • D"false'

What is the result of the following code? 
var arr = [1, 2, 3];
console.log(Array.isArray(arr));

  • Atrue
  • Bfalse
  • C"true"
  • D"false"

What does the following function do in JavaScript? 
function greet(name) {
return "Hello, " + name + "!";
}

  • Agreets the user by name
  • Bcalculates the area of a circle
  • Cconverts a string to uppercase
  • Dchecks if a string is a palindrome

What does the following function do in JavaScript? 
function getArea(radius) {
return Math.PI * radius * radius;
}

  • A calculates the area of a circle
  • B converts a string to uppercase
  • Cchecks if a string is a palindrome
  • Dsorts an array in ascending order

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