Types

Mac is dynamically typed. Every value belongs to one of the following types at runtime.

Scalar Types

Numbers

All numbers are 64-bit floating point. There is no separate integer type.

var x = 42;
var pi = 3.14159;
var neg = -7;

Strings

Strings are delimited by double quotes.

var greeting = "Hello, World!";

String Interpolation

Any double-quoted string can embed expressions inside { and }. The expression is evaluated at runtime and its result is converted to a string and concatenated in place.

var name = "Mac";
print "Hello, {name}!";           // Hello, Mac!
print "2 + 2 = {2 + 2}";         // 2 + 2 = 4
print "{upper(name)} LANG";       // MAC LANG

To include a literal { in a string, escape it with a backslash:

print "literal \{brace}";         // literal {brace}

The + operator also auto-converts non-string values to strings when the other operand is a string:

print "count: " + 42;             // count: 42

String Templates

The @"path" syntax resolves a file path relative to the script's directory.

var img = @"assets/photo.png";

Collection Types

See Arrays and Maps for details.

Enum Types

Enum variants are accessed via EnumName.Variant. Data variants are constructed like function calls: Shape.Circle(5). See Enums for details.

Meme Types

Type Checking

Use type() to inspect a value's type at runtime.

print type(42);          // number
print type("hi");        // string
print type(true);        // bool
print type(nil);         // nil
print type([1, 2]);      // array
print type({"a": 1});    // map