Loops

Numeric For

for i: integer = 1, 10 do
    print(i)
end

-- with step
for i: integer = 0, 100, 5 do
    print(i)
end

-- counting down
for i: integer = 10, 1, -1 do
    print(i)
end

For Each

local names: table<string> = {"Arthur", "Merlin", "Lancelot"}

for name: string in names do
    print(name)
end

-- with index
for i: integer, name: string in names do
    print(i .. ": " .. name)
end

-- types are optional — inferred from the iterated value
for name in names do
    print(name)
end

While

local hp: integer = 100

while hp > 0 do
    hp = hp - 10
end

Repeat Until

Runs at least once, checks the condition at the end:

local tries: integer = 0

fn getInput() -> string?
    tries = tries + 1
    if tries < 3 then
        return nil
    end
    return "ready"
end

local input: string? = nil

repeat
    input = getInput()
until input != nil

println(input ?? "")            -- ready
println(tries)                  -- 3, the body always ran at least once

Break and Continue

for i: integer = 1, 10 do
    if i == 5 then continue end
    if i == 8 then break end
    print(i)    -- prints 1, 2, 3, 4, 6, 7
end

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