Maps (aka Associative Arrays)

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Maps1.swift

#!/usr/bin/env swift;
import Foundation
import Utils

// Begin Main
var dictionary:[String: String] = [:]

print("dictionary size: " + String(dictionary.count))
print("dictionary is " + (dictionary.isEmpty ? "empty" : "not empty"))
dictionary["apple"] = "red"
dictionary["banana"] = "yellow"
dictionary["cantaloupe"] = "orange"
dictionary["dragonfruit"] = "red"
dictionary["elderberry"] = "purple"

print("dictionary size: " + String(dictionary.count))
print("dictionary is " + (dictionary.isEmpty ? "empty" : "not empty"))

print("bananas are " + dictionary["banana"]!)

var x:String = "dragonfruit"
if dictionary.keys.contains(x) {
	print(x + " are " + dictionary[x]!)
} else {
	print("Can't find " + x)
}

x = "fig"
if dictionary.keys.contains(x) {
	print(x + " are " + dictionary[x]!)
} else {
	print("Can't find " + x)
}

x = "elderberry"
dictionary.removeValue(forKey: x)
if dictionary.keys.contains(x) {
	print(x + " are " + dictionary[x]!)
} else {
	print("Can't find " + x)
}

print(Utils.mapToString(dictionary))

exit(EXIT_SUCCESS)

Maps2.swift

#!/usr/bin/env swift;
import Foundation
import Utils

// Begin Main
var planetDiameters:[String: Int] = [
	"Mercury": 4879,
	"Venus": 12103,
	"Earth": 12756,
	"Mars": 6794,
	"Jupiter": 142985,
	"Saturn": 120534,
	"Uranus": 51115,
	"Neptune": 49534,
	"Pluto": 2374,
	"Ceres": 946,
	"Eris": 2326,
	"Makemake": 1430
]

for planet in planetDiameters.keys {
	print(planet + " has a diameter of " + String(planetDiameters[planet]!) + " km")
}

exit(EXIT_SUCCESS)

Questions

• {{Who's on first?}}
• {{Who's on second?}}
• {{Who's on third?}}

Projects

More ★'s indicate higher difficulty level.

• The Farmer in the Dell

References

• [[Swift Community]]
• [[Swift Language Guide]]
• [[Swift Language Reference]]
• [[Swift Programming Language]], Apple Inc.
• [[Swift Doc]]
• [[We Heart Swift]]
• [[Swift Cookbook]]
• [[Swift Playground]]
• [[Swift at TutorialsPoint]]
• [[Hacking with Swift]]