Basic Syntax

Sage syntax is designed to be familiar to developers coming from Rust, TypeScript, or Go.

Comments

// Single-line comment

/*
   Multi-line comment
   (not yet supported)
*/

Variables

Variables are declared with let:

let x = 42;
let name = "Sage";
let numbers = [1, 2, 3];

Variables are immutable by default. Reassignment creates a new binding:

let x = 1;
x = 2;  // Reassigns x

Operators

Arithmetic

let sum = 1 + 2;
let diff = 5 - 3;
let product = 4 * 2;
let quotient = 10 / 2;

Comparison

let eq = x == y;
let neq = x != y;
let lt = x < y;
let gt = x > y;
let lte = x <= y;
let gte = x >= y;

Logical

let and = a && b;
let or = a || b;
let not = !a;

String Concatenation

let greeting = "Hello, " ++ name ++ "!";

String Interpolation

Strings support interpolation with {identifier}:

let name = "World";
let greeting = "Hello, {name}!";  // "Hello, World!"

Semicolons

Following Rust conventions:

• Required after: let, return, assignments, expression statements, run
• Not required after: if/else, for, while blocks

let x = 1;           // semicolon required
if x > 0 {           // no semicolon after block
    print("positive");
}