Variables

A colon prefix marks a definition explicitly.

:subtotal = 100
:subtotal * 2 // 200

A bare name also works.

count = 10
count + 5 // 15

Functions

f(x) = 2*x + 1
f(5) // 11

Parameters are scoped to the call, so a parameter named x never disturbs a variable named x defined elsewhere in the document.

:x = 100
double(x) = x * 2
double(5) // 10