Reading Documentation 1

Front 1

Consider the following method and a call to that method:

def my_method(a, b = 2, c = 3, d)

p [a, b, c, d]

end

my_method(4, 5, 6)

Use the ruby documentation to determine what this code will print.

Back 1

[4, 5, 3, 6]

See here for explanation:

http://ruby-doc.org/core-2.3.2/doc/syntax/calling_methods_rdoc.html

Front 2

Give an example of positional arguments for a method

Back 2

my_method(argument1, argument2)

Front 3

Give an example of default positional arguments for a method

Back 3

def my_method(a, b, c = 3, d = 4)

p [a, b, c, d]

end

Here c and d have default values which ruby will apply for you. If you send only two arguments to this method:

my_method(1, 2)

You will see ruby print [1, 2, 3, 4].

Front 4

What will this print?

def my_method(a, b, c = 3, d = 4)

p [a, b, c, d]

end

my_method(1, 2, 5)

Back 4

[1, 2, 5, 4]

Ruby fills in the missing arguments from left to right.

Front 5

What is the order that methods accept arguments?

Keyword

Block

Positional

Back 5

Positional > Keyword > Block

Front 6

Give an example of keyword arguments for a method

Back 6

my_method(positional1, keyword1: value1, keyword2: value2)

Note that positional arguments are always accounted for first by the method.

Front 7

Give an example of block arguments for a method

Back 7

my_method do

# ...

end

OR ANOTHER WAY TO EXPRESS THIS

my_method {

# ...

}

Note do/end has lower precedence then {...}

Front 8

What method could you use to right justify a str object?

Back 8

rjust()

a = "hello"

a.rjust(20) #=> " hello"

This method is not destructive

Front 9

Fill in the blank

• Class methods are called on the_____
  

• Instance methods are called on ______
  

Back 9

1. class
2. objects