???
?: Collection types are called scalar data types.
( ) TRUE (X) FALSE
?: Which syntax can be used to make a new, empty Array?
( ) Array.new
( ) new_array
( ) new_array = []
(X) Both A and C
?: Which syntax can be used to add items to an Array?
( ) new_array = "New String"`` ( ) new_array << "New String"( )new_array.push("New String")```
(X) Both B and C
?: Which method removes (and returns) the last element from an array?
( ) .shift
( ) .unshift
( ) .last
(X) None of the above
?: Which range operator excludes the last value from a sequence?
( ) ..
( ) .range
(X) ...
( ) <=>
?: Which syntax can be used to create a new Hash?
( )
new_hash = {
:name => "Mario"
}
( ) Hash.new
( ) new_hash = {}
(X) All of the above.
?: What syntax can be used to return the value of the key pearl?
drumset_colors = {
:tama => "burgundy",
:pearl => "blue",
:yamaha => "black",
:ludwig => "white"
}
( ) drumset_colors[1]
(X) drumset_colors[:pearl]
( ) drumset_colors["pearl"]
( ) drumset_colors[pearl]
?: What syntax can be used to return the value of size for Yamaha?
drumsets = { tama: {color: "burgundy", size: 7}, :pearl => {color: "blue", size: 5}, yamaha: {color: "black", size: 5}, ludwig: {color: "white", size: 5}}
(X) drumsets[:yamaha][:size]
( ) drumsets[yamaha][size]
( ) drumsets["yamaha"]["size"]
( ) drumsets[:yamaha]
?: What will cars["toyota"] evaluate to?
cars = { toyota: ["avalon","camry"], honda: ["civic", "accord"] }
( ) ["avalon","camry"] ( ) ["avalon"] ( ) ["camry"] (X) None of the above.
?: What will the command cars[:ford] = "focus" do?
cars = { totoya: ["avalon","camry"], honda: ["civic", "accord"] }
=> {:totoya=>["avalon", "camry"], :honda=>["civic", "accord"]}`
( ) Overwrite the hash
( ) Throw an error
( ) Return nil
(X) Update the hash
?: What will the command cars[:ford] = "taurus" do?
{:totoya=>["avalon", "camry"], :honda=>["civic", "accord"], :ford=>"focus"}
(X) Overwrite the value of cars[:ford]
( ) Add an additional value to cars[:ford]
( ) Update the value of cars[:ford] to "focustaurus"
( ) Remove the key-value pair.
???