Operators - Soli MVC Documentation

Arithmetic Operators

Operator	Description	Example
+	Addition	5 + 3 = 8
-	Subtraction	5 - 3 = 2
*	Multiplication	5 * 3 = 15
/	Division	6 / 2 = 3.0
%	Modulo	5 % 2 = 1

Comparison Operators

Operator	Description
==	Equal to
!=	Not equal to
<	Less than
<=	Less than or equal
>	Greater than
>=	Greater than or equal

Logical Operators

&& Logical AND

Both conditions must be true.

let age = 25;
let has_license = true;

if (age >= 18 && has_license) {
    print("Can drive");
}

|| Logical OR

At least one condition must be true.

if (is_weekend || is_holiday) {
    print("Day off!");
}

! Logical NOT

Negates the condition.

if (!is_raining) {
    print("No umbrella needed");
}

String Operations

+ String Concatenation

// Concatenation
let greeting = "Hello, " + "World!";    // "Hello, World!"
let message = "Value: " + 42;           // "Value: 42" (auto-conversion)

// String methods
let text = "  Hello, World!  ";
print(text.trim());        // "Hello, World!"
print(text.upper());       // "  HELLO, WORLD!  "
print(text.lower());       // "  hello, world!  "
print(text.len());         // 18

// Substring operations
let s = "Hello, World!";
print(s.sub(0, 5));        // "Hello" (from index 0, length 5)
print(s.find("World"));    // 7 (index of first occurrence)
print(s.contains("Hello"));  // true
print(s.starts_with("Hell"));  // true
print(s.ends_with("!"));      // true

Null Coalescing

?? Null Coalescing Operator

Use ?? to provide default values for null.

let user = {"name": "Alice", "email": null};

// Traditional null check
let email = user["email"];
if (email == null) {
    email = "unknown";
}

// Null coalescing operator
let display_email = user["email"] ?? "unknown";

// Chaining with null values
let city = user["address"]["city"] ?? "Unknown City";
// If any key in the chain is null/missing, returns "Unknown City"

Range Operator

.. Range Operator

Creates a range of integers (exclusive end).

// Range creates an array
let numbers = 1..5;  // [1, 2, 3, 4]

// Use in for loops
for (i in 0..10) {
    print(i);  // 0, 1, 2, 3, 4, 5, 6, 7, 8, 9
}