Declare functions

 // Declare our new function function myFunction() {  trace("Hello!"); } // Call it myFunction(); 

Declare function with arguments

 // Declare our new function function sayHelloTo(name:String) {  trace('Hello ${name}'); } // Call it sayHelloTo("Mark"); 

See https://haxe.org/manual/types-function.html

Declare functions with default arguments

 // Declare a function with one parameter which has a default value set function sayHello(name:String = "Mark") {  trace('Hello ${name}'); } // Call it without any parameter and the 'default' one will be used sayHello(); // Let's call it again with some parameter sayHello("John"); 

See https://haxe.org/manual/types-function-default-values.html

Declare functions with optional arguments

 // Declare a function with one optional parameter function sayHello(?name:String) {  if (name != null) {  trace('Hello ${name}');  } else {  trace('No name');  } } // Call it without any parameter and the 'default' one will be used sayHello(); // Let's call it again with some parameter sayHello("Sander"); 

See https://haxe.org/manual/types-function-optional-arguments.html

Declare a function with return type

 // Declare our new function function sum(a:Int, b:Int):Int {  return a + b; } // Call it var result = sum(2, 4); trace(result); 

See https://haxe.org/manual/types-function.html

Declare a function with parameterized arguments

 // Declare our new function function equals<T>(a:T, b:T):Bool {  return a == b; } // Call it with integers trace(equals(2, 2)); // true trace(equals(2, 1)); // false // Call it with strings trace(equals("hello","hello")); // true trace(equals("hello","world")); // false 

See https://haxe.org/manual/type-system-type-parameters.html

Declare an inline function

 // Declare our new function inline function sum(a:Int, b:Int):Int {  return a + b; } // Call it var result = sum(2, 4); trace(result); 

In JavaScript this will be compiled (where possible) as:

 var result = 6; console.log(result); 

See https://haxe.org/manual/class-field-inline.html