Treasure Chest
10 Points
parametric-types
Instructions
In this exercise you're going to write a generic (/ magical!) TreasureChest, to store some treasure.
1. Define the TreasureChest type
Define a TreasureChest{T} parametric type with two fields.
- A
passwordfield of typeString, which will be used to store the password of the treasure chest. - A
treasurefield of typeT, which will be used to store the treasure. This value is generic so that the treasure can be anything.
julia> chest = TreasureChest{String}("password", "gold")
TreasureChest{String}("password", "gold")2. Define the get_treasure() function
This function should take two arguments.
- A
String(for trying a password) - A
TreasureChesttype
This function should check the provided password attempt against the password in the TreasureChest.
- If the passwords match then return the treasure.
- If the passwords do not match then return
nothing.
julia> get_treasure("password", chest)
"gold"
julia> get_treasure("wrong", chest)
# no output
julia> isnothing(get_treasure("wrong", chest))
true3. Define the multiply_treasure() function
This function should take two arguments.
- An integer multiplier
n. - A
TreasureChest{T}type.
The function should return a new TreasureChest{Vector{T}}, with
- The same password as the original
- The multiplied treasure as a
Vector{T}of lengthn, and the original treasure repeatedntimes.
julia> multiply_treasure(3, chest)
TreasureChest{Vector{String}}("password", ["gold", "gold", "gold"])Treasure Chest
10 Points
parametric-types
Instructions
In this exercise you're going to write a generic (/ magical!) TreasureChest, to store some treasure.
1. Define the TreasureChest type
Define a TreasureChest{T} parametric type with two fields.
- A
passwordfield of typeString, which will be used to store the password of the treasure chest. - A
treasurefield of typeT, which will be used to store the treasure. This value is generic so that the treasure can be anything.
julia> chest = TreasureChest{String}("password", "gold")
TreasureChest{String}("password", "gold")2. Define the get_treasure() function
This function should take two arguments.
- A
String(for trying a password) - A
TreasureChesttype
This function should check the provided password attempt against the password in the TreasureChest.
- If the passwords match then return the treasure.
- If the passwords do not match then return
nothing.
julia> get_treasure("password", chest)
"gold"
julia> get_treasure("wrong", chest)
# no output
julia> isnothing(get_treasure("wrong", chest))
true3. Define the multiply_treasure() function
This function should take two arguments.
- An integer multiplier
n. - A
TreasureChest{T}type.
The function should return a new TreasureChest{Vector{T}}, with
- The same password as the original
- The multiplied treasure as a
Vector{T}of lengthn, and the original treasure repeatedntimes.
julia> multiply_treasure(3, chest)
TreasureChest{Vector{String}}("password", ["gold", "gold", "gold"])