Collections and Data Structures

# arrays.jl

day_array = ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]
day = "Thursday"

array_length = length(day_array)
array_first_day = day_array[1]
array_last_day = day_array[end]

println("Length of array: $array_length")
println("First day of week: $array_first_day")
println("Third day of week: $(day_array[3])")
println("Last day of week: $array_last_day")

println("$day is in $day_array: $(in(day, day_array))")

# add Sunday to beginning and Saturday to end
pushfirst!(day_array, "Sunday")
push!(day_array, "Saturday")

# print each element of array
println("Day of week: ")
for i in 1:length(day_array)
    println("  $(day_array[i])")
end

println("Day of the week: $(join(collect(day_array), ";"))")

# sort the array and print again
sort!(day_array)
println("Day of the week (sorted): $(join(collect(day_array), ";"))")

Length of array: 5
First day of week: Monday
Third day of week: Wednesday
Last day of week: Friday
Thursday is in ["Monday", "Tuesday", "Wednesday", "Thursday", "Friday"]: true
Day of week: 
  Sunday
  Monday
  Tuesday
  Wednesday
  Thursday
  Friday
  Saturday
Day of the week: Sunday;Monday;Tuesday;Wednesday;Thursday;Friday;Saturday
Day of the week (sorted): Friday;Monday;Saturday;Sunday;Thursday;Tuesday;Wednesday

# sets.jl

color_set = Set(["red", "yellow", "blue"])
color_set2 = Set(["red", "orange", "yellow"])

println("Length	of set:	$(length(color_set))")

println("Color Set 1")
for color in color_set
    println("  $(color)")
end

println("Color Set 2: $(join(collect(color_set2), "---"))")

println("Intersection: $(intersect(color_set, color_set2))")
println("Union: $(union(color_set, color_set2))")
println("Difference: $(setdiff(color_set, color_set2))")
println("Difference: $(setdiff(color_set2, color_set))")

Length	of set:	3
Color Set 1
  yellow
  blue
  red
Color Set 2: yellow---orange---red
Intersection: Set(["yellow", "red"])
Union: Set(["yellow", "orange", "blue", "red"])
Difference: Set(["blue"])
Difference: Set(["orange"])

# dicts.jl

day_dict = Dict()
day_length_dict = Dict()

day_dict["Mon"] = "Monday"
day_dict["Tue"] = "Tuesday"
day_dict["Wed"] = "Wednesday"
day_dict["Thu"] = "Thursday"
day_dict["Fri"] = "Friday"

if haskey(day_dict, "Wed")
   println("$(day_dict["Wed"])")
end

if !haskey(day_dict, "Sat")
   println("no key \"Sat\"")
end

println("print key-value pairs")
for day in keys(day_dict)
    println("  $day = $(day_dict[day])")
end

println("print values (sorted)")
for day_value in sort(collect(values(day_dict)))
    println("  $day_value")
end

# get length of each value and keep track of lengths
for day_value in values(day_dict)
    day_length = length(day_value)
    day_length_dict[day_value] = day_length
end

println("print lengths")
for day in keys(day_length_dict)
    println("  $day = $(day_length_dict[day])")
end

println("print lengths in descending order")
for (day, length) in sort(collect(zip(values(day_length_dict), keys(day_length_dict))), rev=true)
    println("  $day = $length")
end

println("print lengths in ascending order")
for (day, length) in sort(collect(zip(values(day_length_dict), keys(day_length_dict))), rev=false)
    println("  $day = $length")
end

Wednesday
no key "Sat"
print key-value pairs
  Wed = Wednesday
  Tue = Tuesday
  Thu = Thursday
  Mon = Monday
  Fri = Friday
print values (sorted)
  Friday
  Monday
  Thursday
  Tuesday
  Wednesday
print lengths
  Friday = 6
  Tuesday = 7
  Thursday = 8
  Wednesday = 9
  Monday = 6
print lengths in descending order
  9 = Wednesday
  8 = Thursday
  7 = Tuesday
  6 = Monday
  6 = Friday
print lengths in ascending order
  6 = Friday
  6 = Monday
  7 = Tuesday
  8 = Thursday
  9 = Wednesday