Control flow¶

`if` / `else`¶

if x > 0 {
    print("positive")
} else {
    print("non-positive")
}

The else branch is optional. Braces are always required.

for with a condition loops until the condition is false:

let i: int64 = 0
for i < 10 {
    print_int(i)
    i = i + 1
}

This is Kod's general looping construct. There is no while keyword.

Iterate over an array with for … in:

let names: [str] = ["alice", "bob", "carol"]
for name in names {
    print(name)
}

The loop variable is declared implicitly — no let needed.

Works inside both loop forms:

let i: int64 = 0
for i < 100 {
    if i == 5 {
        break
    }
    i = i + 1
}

for x in items {
    if x == skip_value {
        continue
    }
    process(x)
}

Pattern matching on enums, integers, and strings. See Pattern matching.

match direction {
    Direction.North -> print("north")
    Direction.South -> print("south")
    else -> print("other")
}

Return a value from a function:

func abs(n: int64) -> int64 {
    if n < 0 {
        return 0 - n
    }
    return n
}

A bare return (no value) is valid in -> none functions.