gs gs106 Lexical Structures - JavaScript Loops - Quiz No.1
gs gs106 Javascript Quiz
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Question 1: What will be the output of the following JavaScript code?
function printArray(a) { var len = a.length, i = 0; if (len == 0) console.log("Empty Array"); else { do { console.log(a[i]); } while (++i < len); } }
Prints the numbers in the array in order
Prints the numbers in the array in the reverse order
Prints 0 to the length of the array
Prints "Empty Array"
Question 2: What are the three important manipulations done in a for loop on a loop variable?
Updation, Incrementation, Initialization
Initialization,Testing, Updation
Testing, Updation, Testing
Initialization,Testing, Incrementation
Question 3: What will the following JavaScript code snippet work? If not, what will be the error?
function tail(o) { for (; o.next; o = o.next) ; return o; }
No, this will throw an exception as only numerics can be used in a for loop
No, this will not iterate
Yes, this will work
No, this will result in a runtime error with the message "Cannot use Linked List"
Question 4: What will be the equivalent code of the following JavaScript code?
for(var p in o) console.log(o[p]); for (var i = 0;i < a.length;i++) console.log(a[i]);for (int i = 0;i < a.length;i++) console.log(a[i]);for (var i = 0;i <= a.length;i++) console.log(a[i]);for (var i = 1;i < a.length;i++) console.log(a[i]);
Question 5: One of the special features of an interpreter in reference with the for loop is that ___________
Before each iteration, the interpreter evaluates the variable expression and assigns the name of the property
The iterations can be infinite when an interpreter is used
The body of the loop is executed only once
the iteration is finite when an interpreter is used
Question 6: What will happen if the body of a for/in loop deletes a property that has not yet been enumerated?
The property will be stored in a cache
The loop will not run
That property will not be enumerated
The property will be enumerated
Question 7: What will be the step of the interpreter in a jump statement when an exception is thrown?
The interpreter stops its work
The interpreter throws another exception
The interpreter jumps to the nearest enclosing exception handler
The interpreter throws an error
Question 8: What will be the role of the continue keyword in the following JavaScript code snippet?
while (a != 0) { if (a == 1) continue; else a++; }
The continue keyword restarts the loop
The continue keyword skips the next iteration
The continue keyword skips the rest of the statements in that iteration
The continue keyword breaks out of the loop
Question 9: What could be the task of the statement debugger in the following JavaScript code?
function f(o) { if (o === undefined) debugger; }
It does nothing but a simple breakpoint
It debugs the error in that statement and restarts the statement's execution
It is used as a keyword that debugs the entire program at once
It is used to find error in the statement
Question 10: Among the keywords below, which one is not a statement?
debugger
with
if
use strict
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