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Functions

Functions package reusable behavior into named pieces of code.

Define a function

functions.tk

fn add(a, b):
    return a + b

print(add(5, 3))

Declare functions and methods with fn.

return.tk

fn square(x):
    return x * x

result = square(8)
print(result)

defaults.tk

fn welcome(name, greeting = "Hello"):
    print(greeting + ", " + name)

welcome("Ayaan")
welcome("Ayaan", "Hi")

Function parameters and values created inside a function are local to that call. Pass data into functions explicitly when possible.

scope.tk

fn double(value):
    result = value * 2
    return result

print(double(21))

Methods use the same fn declaration as other functions and receive self explicitly.

method.tk

class Counter:
    fn __init__(self, start=0):
        self.value = start

    fn increment(self):
        self.value += 1
        return self.value