Declaring data

EGL native types are in three categories:

Simple value types:

BigInt, Bytes(n), Date, Decimal(n), Decimal(n, p),

Float, Int, SmallFloat, SmallInt, Timestamp(pattern)

Simple reference types:

Bytes, Decimal, Number, String (now a value type),

String(n), Timestamp (now a value type)

Other reference types:

Any, Dictionary, List

Your custom types are based on these EGL classifiers:

Delegate, Enumeration, ExternalType, Handler,

Interface, Library, Program, Record, Service

Values of simple value types

/* Numeric value types */ 
 
// defaults to 0.
someVal Int;                
 
// defaults to null.
someVal Int?;      
 
// initializes the value to 15 and allows a future value to be null.        
someVal Int? = 15;  
 
// initializes the value, which is unchangeable.
const NUMBEROFDAYS Int = 7;        
 
// defaults to 0.0.
coord Float;       
 
// defaults to 000.00.
// the field that can hold 5 digits total, always with 2 after the decimal point.             
amount Decimal(5,2);        
 
 
 
 
 
 
 
/* Character value types */ 
 
// defaults to "".
firstName String;
 
// defaults to null.           
firstName String?; 
 
// initializes value to "John".         
firstName String = "John";  
 
 
 
 
 
// defaults to false         
toggle Boolean;             
 
// defaults to today's date.
dob Date;    
 
// defaults to the current timestamp.
ts Timestamp?;
 
// value can be set to any value (primitive, object, etc). See the casting examples later.
x Any?;

Values of other reference types

Values of type List

Lists

vals Int[];                // new dynamic array of size 0
vals Int[]?;               // dynamic list, but not instantiated (vals must be instantiated before it can be accessed)
vals Int[] = new Int[4];   // new dynamic array of size 4; all values set to their default value (0 in this example)
 
names String[] = [ "Paul", "John", "George", "Ringo" ];   // dynamic array, initialized with 4 values
names[1] = "Bob";                                         // assigns the first index in the array to "Bob"
names[names.getSize()] = "Ken";                           // assigns the last index in the array to "Ken"
 
cities String[];                           // new dynamic array of size 0
cities.appendElement("Delta");             // appends a new value to the end of the array
cities.appendAll([ "Denver", "Pueblo" ]);  // appends two new values to the end of the list cities.removeElement(2);                   // removes the second value in the array 
cities.removeAll();                        // removes all values from the array

Constants

// The value is not changeable.
const NUMBEROFDAYS Int = 7;
 
// The element values are changeable, but the name cannot refer to another list.
const MINIMUMNUMBERS INT[] = [1,2,3,4,5];