Consider the following code snippet var c = counter() d =

Consider the following code snippet var c = counter() d =...

Home / Javascript / Array And Function / Question

Examveda

Consider the following code snippet :

var c = counter(), d = counter(); 
function constfuncs() 
{
    var funcs = [];
    for(var i = 0; i < 10; i++)
        funcs[i] = function() { return i; };
    return funcs;
}
var funcs = constfuncs();
funcs[5]()

What does the last statement return ?

A. 9

B. 0

C. 10

D. None of the mentioned

Answer: Option C

Solution (By Examveda Team)

The code above creates 10 closures, and stores them in an array. The closures are all defined within the same invocation of the function, so they share access to the variable i. When constfuncs() returns, the value of the variable i is 10, and all 10 closures share this value. Therefore, all the functions in the returned array of functions return the same value.

This Question Belongs to Javascript >> Array And Function

Join The Discussion

Related Questions on Array and Function

Consider the code snippet given below

var count = [1,,3];

What is the observation made?

A. The omitted value takes “undefined”

B. This results in an error

C. This results in an exception

D. None of the mentioned

View Answer

Consider the following code snippet

var a1 = [,,,]; 
var a2 = new Array(3); 
0 in a1 
0 in a2

The result would be

A. true false

B. false true

C. true true

D. None of the above

View Answer

The pop() method of the array does which of the following task ?

A. decrements the total length by 1

B. increments the total length by 1

C. prints the first element but no effect on the length

D. None of the mentioned

View Answer

Consider the following code snippet :

if (!a[i]) continue ;

What is the observation made ?

A. Skips the undefined elements

B. Skips the non existent elements

C. Skips the null elements

D. All of the mentioned

View Answer

Consider the following code snippet :
`var c = counter(), d = counter(); function constfuncs() { var funcs = []; for(var i = 0; i < 10; i++) funcs[i] = function() { return i; }; return funcs; } var funcs = constfuncs(); funcs[5]()`
What does the last statement return ?

Solution (By Examveda Team)

Join The Discussion

Read More: MCQ Type Questions and Answers