Q. What is a type, and why do you think types are useful in writing programs?
A. Type is the kind of value the variable will be able to hold. Types are important in any programming languages because they define the way the valiable will behave and also indicates the programmer about the kind of value it may contain. This is also useful to determine the kind of operations that can be performed on a variable or between variables. For e.g. the multiplication operation cannot take place between two strings.

Q. Why do we lose precision when performing operations with decimal numbers in Javascript? Can you think of a few implications of why this would be a problem?
A. As JavaScript has only one number type in javascript that doesn’t actually have ‘double’. This will be a problem calculating complex calculations such as share market or chemical formula calculations.

Q. Do you understand why the following operation produces the given result 115 * 4 – 4 + 88 / 2 = 500
A. The multiplication or devision operations has higher priorities as compared to the addition and division operations. So the flow goes as below
115 * 4 – 4 + 88 / 2
= 460 – 4 + 44
= 456 + 44
= 500

Q. Will the following statement evaluate to true or false
((“red” != “car”) || (3 >= 9)) && !(((10 * 2) == 100) && true)
A. Evaluate as below
((“red” != “car”) || (3 >= 9)) && !(((10 * 2) == 100) && true)
= ((true) || (false)) && ! ((20)==100) && true)
= true && !((false) && true)
= true && !(false)
= true && true
= true

Q. What does typeof 4.5 do, and why does typeof (typeof 4.5) return “string” ?
A.1. number
A.2. Because typeof(number) = string

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ASP.NET Dynamic controls: Twice click problem