Answer the following questions true (T) or false (F)
1. A class invariant is a statement that is always true for every object of the class.
2. You should avoid the use of null as an argument to a method.
1. True
2. False
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Which of the following statements is false?
a. The built-in function len returns the number of key–value pairs in a diction-ary. b. You can use a dictionary as a condition to determine if it’s empty—a non-empty diction-ary evaluates to True. c. An empty dictionary evaluates to False. d. Method clean deletes the dictionary’s key–value pairs:
One of the first functions of ________ e-commerce was the online auction
Fill in the blank(s) with correct word
____ is an example of a JavaScript keyword.
A. If B. Else C. Return D. all of the above
Which command is used to insert text that is stored on the Clipboard into a document?
A. Copy B. Drop C. Paste D. Insert