UGC NET CSE | July 2018 | Part 2 | Question: 1

Question

Consider the JavaScript Code:

var y=”12”
function f() {
var y=”6”;
alert (this.y);
function g() {alert (y); }
g();
}
f();

If $M$ is the number of alert dialog boxes generated by this JavaScript code and D1, D2, $\dots$, $D_M$ represents the content displayed in the each of the $M$ dialog boxes, then: 

• A. M=3; D1 displays “12”; D2 displays “6”; D3 displays “12”
• B. M=3; D1 displays”6”; D2 displays “12”; D3 displays “6”
• C. M=2; D1 displays”6”; D2 displays “12”.
• D. M=3; D1 displays”12”; D2 displays “6”

Comments

In D. option value of M=2 in the question paper.

Answer 1

Answer must be 4

Comments

Alert box will be called 2 times so  m=2

first dialog box alert(this.y) is used to access the value of variable which is outside from f().so d1=12

second dialog box alert(y) inside nested function g() is used to access the local variable y. so d2 will be 6

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What is topic is this??

is it in the gate syllabus??