1. What will be the output of the following JavaScript code If these is a p tag element with id=”demo”?

var numbers1 = [4, 9];
var numbers2 = numbers1.map(myFunction);
document.getElementById("demo").innerHTML = numbers2;
function myFunction(value, index, array)
{
return value * 2;
}

2. The correct syntax to write “Hello World” in javascript.

3. Which of the following function of the String object returns the character in the string starting at the specified position via the specified number of characters?

4. Will the following JavaScript code work?

var js = (function(x) {return x*x;}(10));

5. Which is the function used to call a function in every time duration?

6. What will be the output of the following code snippet?

a = [1, 2, 3, 4, 5];
print(a.slice(2, 4));

7. Which collection object allows unique value to be inserted only once?

8. Arrays in JavaScript are defined by which of the following statements?

9. What will be the output of the following JavaScript code?

const curr = new Date();
 document.write(curr);

10. How are windows, tabs, iframes, and frames treated according to client-side javascript?

11. What will be the output of the following code snippet?

let a = [1, 2, 3, 4, 5, 6];
var left = 0, right = 5;
var found = false;
var target = 5;
while(left <= right) {
   var mid = Math.floor((left + right) / 2);
   if(a[mid] == target) {
       found = true;
       break;
   }
   else if(a[mid] < target) {
       left = mid + 1;
   }
   else {
       right = mid - 1;
   }
}
if(found) {
   print("YES");
}
else {
   print("NO");
}

12. how can you write into HTML output using javascript?

13. What is the central concept of JavaScript memory management?

14. Which object in Javascript doesn’t have a prototype?

15. What will be the output of the following JavaScript code?

var quiz=[1,2,3];
var js=[6,7,8];
var result=quiz.concat(js);
document.writeln(result);