3.06.md

Hands-on Exercise #6

Take this quiz

1. The smallest standalone element of a program that expresses some action to be carried out.

• statement
• expression

2. A combination of one or more explicit values, constants, variables, operators, and functions that the programming language interprets and computes to produce another value.

• statement
• expression

3. Which are "parentheses" or "parens?"

• ()
• {}
• []

4. Which are "curly braces" or "curlies" or "braces?"

• ()
• {}
• []

5. Which are "brackets?"

• ()
• {}
• []

6. The "scope" of a variable is where you can access the variable, eg, write to it or read the value from it. *

• true
• false

7. In Go, an int is a primitive data TYPE

• true
• false

8. In Go, a string is a primitive data TYPE

• true
• false

9. A "composite" data TYPE allows you to compose together values of other data TYPES

• true
• false

10. When a variable is declared in Go using the var keyword, and no VALUE is ASSIGNED to that variable, then the compiler assigns a default value to the variable. This is known as the "zero value"

• true
• false

11. Keywords are words that a reserved for use by the Go programming language; they have to be used in a certain way for a certain purpose.

• true
• false

12. Keywords are sometimes called "reserved words."

• true
• false

13. You can’t use a keyword for anything other than its purpose.

• true
• false

14. In 2 + 2 the + is the OPERATOR

• true
• false

15. In 2 + 2 the 2s are OPERANDS

• true
• false

16. For finding documentation, what is the difference between documentation found at golang.org and godoc.org?

17. package is a keyword

• true
• false

18. var is a keyword

• true
• false

19. The entry point for all programs is in func main() which needs to be inside package main

• true
• false

20. The "short declaration operator" can be used anywhere in a program, including at both the package level and at the block level.

• true
• false

21. What are the three words used to describe good package names in the "effective go" document?

• descriptive
• short
• concise
• evocative

22. What is the name of the website where you can write (most) Go code online and have it run online?

23. A great place to ask questions is the "golang bridge forum" at https://forum.golangbridge.org/

• true
• false

24. When you see something like fmt.Println() this is calling the Println() function from the fmt package.

• true
• false

25. An "identifier" is the name assigned to a variable or a function or a constant.

• true
• false

26. To call a func, variable, or constant from a package, use the "package-dot-identifier" syntax. For example, like this, fmt.Println()

• true
• false

27. What is "idiomatic Go code"?

28. Which character allows you to "throw away returns" or "send returns into the void"? Said another way, which character allows you to tell the compiler that you are not going to use a value returned by a function?

• #
• @
• _
• This is a trick question

29. In Go, you cannot have a variable which you do not use.

• true
• false

30. When you see that a func has a parameter of this type ...interface{} this is called a "variadic parameter" and it means that the func can take as many values of that type as you want to pass in.

• true
• false

31. Every value in Go is also of type "empty inerface" which is expressed like this: interface{}

• true
• false

32. A statement is an instruction that commands the computer to perform a specified action. Usually statements take up a line in a program.

• true
• false

33. An expression is a combination of one or more explicit values, constants, variables, operators, and functions that the programming language interprets and computes to produce another value. For example, 2+3 is an expression which evaluates to 5.

• true
• false

34. If I wanted to print to a string and then assign that value to a variable, I could use the func Sprintf() from the fmt package.

• true
• false

35. In Go, you can create your own TYPE

• true
• false

36. We don't say "casting" in Go, we say "conversion"

• true
• false

37. There is a language which we use to talk about the language.

• true
• false

38. When you create our own TYPE in Go, that TYPE will have an "underlying TYPE".

• true
• false