Question

1. Use the postfix increment operator (++) to increment a number stored in a variable. Display the value of thevariable before, while, and after incrementing. Use the prefix increment operator to increment the number anddisplay its results before, while, and after incrementing by using an alert.
2. True or False: Unary operators don’t appear in JavaScript very often.
3. True or False: It's always best to save bytes (using JavaScript shortcuts whenever possible) rather than use returns and indenting, which can slow down page loading

Answer 1

Javascript Code:-

Post Increment :-

var num1 = 1 ; // initialise a number

alert( 'Before: ' + num1) ; // before increment OUTPUT: 1

alert( 'While: ' + (num1++)) ; // post-incrementing OUTPUT: 1

alert( 'After: ' + num1) ; // after increment OUTPUT: 2

Pre Increment :-

var num2 = 2;

alert( 'Before: ' + num2) ; //before increment OUTPUT: 2

alert( 'While: ' + (++num2)) ; //pre incrementing OUTPUT: 3

alert( 'After: ' + num2); //after increment OUTPUT: 3

Statement 1:

Q. "Unary operators do not appear in Javascript very often"

Ans : The above statement is FALSE . First of all, let us know the meaning of 'very often' which means 'again and again' or 'repeatedly'. It is obvious that we use unary operator frequently. Therefore, the given statement is incorrect i.e. FALSE.

Statement 2:

Q. " It always best to save bytes (using Javascript shortcuts whenever possible) rather than use returns and indenting, which can slow down page loading."

Ans: We might not expect the slowing down of downloading in case of smaller files. But, it really shows a great difference when a user is downloading larger files. Therefore, the given statement is TRUE.