PFB1/chapter8_code_to_copy.txt at master · TimLavers/PFB1 · GitHub

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P66
package pfb.basics

fun main(args: Array<String>) {
    val sightings = mutableListOf<String>()
    sightings.add("emu")
    sightings.add("magpie")
    sightings.add("galah")
    sightings.add("emu")

    println("Number of bird sightings: " + sightings.size)
    if (sightings.contains("emu")) {
        println("Saw an emu!")
    }
    if (sightings.contains("brolga")) {
        println("Saw a brolga!")
    }
    println("Third sighting: " + sightings[2])
}


package pfb.basics

fun main(args: Array<String>) {
    val birds = mutableSetOf<String>()
    birds.add("emu")
    birds.add("magpie")
    birds.add("galah")
    birds.add("emu")

    println("Number of bird species: " + birds.size)
    if (birds.contains("emu")) {
        println("Saw an emu!")
    }
    if (birds.contains("brolga")) {
        println("Saw a brolga!")
    }
}


P67
package pfb.basics

fun main(args: Array<String>) {
    val nameToAge = mutableMapOf<String, Int>()
    nameToAge.put("Harry", 15)
    nameToAge.put("Luna", 16)
    nameToAge.put("Snape", 36)

    println("Harry's age: " + nameToAge["Harry"])
    println("Luna's age: " + nameToAge["Luna"])
    println("Snape's age: " + nameToAge["Snape"])
}


P68
package pfb.basics

fun main(args: Array<String>) {
    val nameToAge = mutableMapOf<String, Int>()
    nameToAge.put("Harry", 15)
    nameToAge.put("Luna", 16)
    nameToAge.put("Snape", 36)

    nameToAge.put("Luna", 17)//Happy birthday!

    nameToAge.remove("Snape")//So long Snape!

    for (name in nameToAge.keys) {
        val age = nameToAge[name]
        println("$name is $age years old")
    }
}


package pfb.basics

fun main(args: Array<String>) {
    //Record the sightings.
    val sightings = mutableListOf<String>()
    sightings.add("emu")
    sightings.add("magpie")
    sightings.add("galah")
    sightings.add("emu")

    //Count the species.
    val speciesToCount = mutableMapOf<String, Int>()
    for (sighting in sightings) {
        val countSoFar = speciesToCount[sighting]
        val updatedCount = countSoFar + 1
        speciesToCount.put(sighting, updatedCount)
    }

    //Print the species counts.
    for (species in speciesToCount.keys) {
        val count = speciesToCount[species]
        println("Number of $species sightings: $count")
    }
}


P70
package pfb.basics

fun main(args: Array<String>) {
    //Record the sightings.
    val sightings = mutableListOf<String>()
    sightings.add("emu")
    sightings.add("magpie")
    sightings.add("galah")
    sightings.add("emu")

    //Count the species.
    val speciesToCount = mutableMapOf<String, Int>()
    for (sighting in sightings) {
        val countSoFar = speciesToCount[sighting] ?: 0
        val updatedCount = countSoFar + 1
        speciesToCount.put(sighting, updatedCount)
    }

    //Print the species counts.
    for (species in speciesToCount.keys) {
        val count = speciesToCount[species]
        println("Number of $species sightings: $count")
    }
}


--------------------------------

P71
package pfb.basics

fun main(args: Array<String>) {
    val sightings = mutableListOf<String>()
    sightings.add("pee-wee")
    sightings.add("cockatoo")
    sightings.add("thick-knee")
    sightings.add("brolga")

    println("Number of bird sightings: " + sightings.size)
    if (sightings.contains("brolga")) {
        println("Saw a brolga!")
    }
    println("Third sighting: " + sightings[2])
}