Epsilon

// Demonstrates EOL (Epsilon Object Language) built-in operations
// Collection operations, string manipulation, and custom operations

operation max2(a : Integer, b : Integer) : Integer {
    if (a > b) return a;
    return b;
}

operation isPrime(n : Integer) : Boolean {
    if (n < 2) return false;
    var i = 2;
    while (i * i <= n) {
        if (n.mod(i) = 0) return false;
        i = i + 1;
    }
    return true;
}

// Sequence operations
var nums = Sequence{1, 2, 3, 4, 5, 6, 7, 8, 9, 10};
("Sum: " + nums.sum()).println();
("Max: " + nums.max()).println();
("Size: " + nums.size()).println();

// Filter primes using select
var primes = nums.select(n | isPrime(n));
("Primes in 1..10: " + primes).println();

// String operations
var message = "Hello from Epsilon!";
message.println();
("Upper: " + message.toUpperCase()).println();
("Length: " + message.size()).println();

// Map collection
var squares = nums.collect(n | n * n);
("Squares: " + squares).println();

// max2 example
("max2(7, 3) = " + max2(7, 3)).println();