Maps (aka Associative Arrays)

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Maps1.swift

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

func main() -> Void {
	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)
}
main()

Maps2.swift

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

func main() -> Void {
	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)
}
main()

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]]