Master programming syntax, solve interactive challenges & run live code in Syntaxis Explore Arena →
menu_book Course Curriculum (Haxe Complete Course) expand_more
Language Basics
Variables and type inference Explicit type annotations String interpolation Numeric types Boolean expressions Null values Array literals Map literals Anonymous structures Dynamic type
Control Flow
if expressions switch expressions Pattern matching switch for loops while loops do while loops break continue try catch throw
Functions
Function declarations Optional parameters Default parameters Rest arguments Anonymous functions Closures Function values Generic functions Inline functions Local functions
Classes & Objects
Class declaration Constructors Instance fields Static fields Properties Getters and setters Inheritance Method override Interfaces Abstract classes
Type System
Enums Enum parameters Typedef Anonymous types Structural typing Generics Type parameters constraints Abstract types @:forward abstract Null<T>
Collections & Iterators
Array map Array filter Array comprehension Map iteration StringMap IntMap ObjectMap Iterator protocol Iterable protocol Lambda helpers
Metaprogramming & Targets
Conditional compilation Compiler defines Metadata @:keep metadata @:native metadata Macros expression Build macros Target-specific code js.Syntax untyped escape hatch
Modules & Practical Haxe
Modules and imports Package declarations using static extensions Access modifiers final fields extern classes Resource embedding Sys.args FileSystem API Cross-target compilation
Haxe Complete Course / Type System

Structural typing

Learn Structural typing in Haxe through the exact construct, a dedicated example, a boundary case, and a mastery check.

12 min read • Intermediate

Structural typing is an atomic Haxe lesson inside Type System. The example uses the specific syntax, command, API, instruction, or language rule named by this lesson.

Study the construct itself, then change one relevant input and predict the result before running it. That keeps this lesson focused on Structural typing rather than on generic Haxe syntax.

Topic-specific example

haxe-05-05.hx
haxe Try It Live 
typedef HasName={name:String}; class Main { static function greet(x:HasName) trace(x.name); static function main(){ greet({name:"Ava",age:31}); } }
Edge case / engineering note

Compile Structural typing for at least one target and watch for target-specific behavior where the feature crosses a platform boundary.

Content source & attribution
Original Syntaxis Content · Original Syntaxis Content

Lesson quizzes

Structural typing Mastery Check →
← PREVIOUS
Anonymous types
NEXT →
Generics