Math and comparison

Math operators produce numbers. Comparison operators produce Booleans.

Arithmetic

Use these operators with numeric values:

let subtotal := 20 + 5;
let discounted := subtotal - 3;
let doubled := discounted * 2;
let bucket := doubled % 10;

Use names for intermediate values when the formula is part of the program meaning.

Ordering

Use ordering operators when you need a Bool result. Passing comparisons produce .True; failing comparisons produce .False.

let port := 8080;
let aboveReserved := port >= 1024;
let withinMaximum := port <= 65535;
let valid := aboveReserved and withinMaximum;

Precedence

Multiplication, division, and remainder bind tighter than addition and subtraction.

let value := 2 + 3 * 4;
let grouped := (2 + 3) * 4;

value is 14. grouped is 20.

Use parentheses when the grouping carries meaning, even when the parser would choose the same order.