struct Stats {
    int count
    []str words
}

fn count_words(str text) -> map[str]int {
    map[str]int counts
    for w in text.split(" ") {
        if w.len > 0 {
            counts[w.lower()] += 1     // a missing key starts at 0
        }
    }
    return counts
}

fn main() {
    ages := ["anna": 31, "bob": 25]
    ages["cyril"] = 40
    ages["bob"] = 26
    print(ages, ages.len)
    print(ages["anna"], ages.has("bob"), ages.has("zoe"), ages.get("zoe", -1))

    for name, age in ages {
        print(name, "is", age)
    }
    for name in ages {
        print(name)
    }

    print(ages.remove("bob"), ages.remove("bob"), ages)
    ages["dave"] = 19                   // goes to the end; insertion order is kept
    print(ages.keys(), ages.values())

    counts := count_words("the cat and The dog and THE bird")
    print(counts)
    print(str(counts))

    // values that own memory
    map[str][]int groups
    for i in 0..10 {
        key := "odd"
        if i % 2 == 0 {
            key = "even"
        }
        groups[key].push(i)            // m[k].push(x) adds the key with an empty array first
    }
    print(groups)

    copy := groups
    copy["odd"].clear()
    print(groups["odd"].len, copy["odd"].len)

    map[int]Stats by_len
    for w in ["a", "bb", "cc", "ddd", "e"] {
        by_len[w.len].count += 1
        by_len[w.len].words.push(w)
    }
    for n, s in by_len {
        print(n, s.count, s.words)
    }

    // many keys: growing, removing and adding again
    map[int]int squares
    for i in 0..1000 {
        squares[i] = i * i
    }
    for i in 0..1000 {
        if i % 3 != 0 {
            squares.remove(i)
        }
    }
    for i in 2000..2010 {
        squares[i] = 1
    }
    total := 0
    for k, v in squares {
        total += v
    }
    print(squares.len, total, squares[999], squares.has(998))

    map[char]bool seen
    for c in "hello" {
        seen[c] = true
    }
    print(seen.keys())

    empty := ages
    empty.clear()
    print(empty, empty.len, ages.len)

    map[str]str m = [:]
    m["x"] = "1"
    print(m)

    for i, w in ["zero", "one", "two"] {
        print(i, w)
    }
    for i, c in "hey" {
        print(i, c)
    }
}