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object.super()
- Aubergine
Syntax
var result = this.super(args);
Parameters
| Parameter | Type | Mandatory | Description | API Version |
|---|---|---|---|---|
| args | Variant |  | Optionally specify any arguments to pass to the superclass constructor or method. | 1.0 |
Return value
| Value | Type | Description | API Version |
|---|---|---|---|
| <result> | Variant | The return value of the superclass constructor/method. | 1.0 |
| <error> | Error | An error occurred. | 1.0 |
Example
// define superclass
var supervillain = function(name, color) {
this.name = name;
this.color = color || "Pink";
}
supervillain.prototype.toString = function() {
return this.name;
}
supervillain.prototype.evilName = function() {
return this.color+" "+this.name;
}
// define class
var villain = function(name, weapon, colour) {
this.weapon = weapon || "Chuck Norris";
this.super(name, colour);
}
villain.inherit(supervillain);
villain.prototype.evilName = function() {
return "Evil "+this.super();
}
// make some instances
var bob = new villain("Bob", "Spoon", "Purple");
var alice = new villain("Alice");
bob.name; // "Bob"
bob.weapon; // "Spoon"
bob.color; // "Purple"
bob.toString(); // "Bob"
bob.evilName(); // "Evil Purple Bob"
alice.name; // "Alice"
alice.weapon; // "Chuck Norris"
alice.color; // "Pink"
alice.toString(); // "Alice"
alice.evilName(); // "Evil Pink Alice"
Notes
By default, super() will search 4 levels of the prototype chain to locate superclass methods. When it finds a super-method, it will cache the result so subsequent calls are significantly faster. Constructor super-constructors are automatically cached during inheritance for maximum instantiation performance.
If you want to increase the depth to which super() will search the prototype chain, you can set this.super to a number like so:
this.super = 10; // this.super() will search 10 levels deep this.super = void super; // revert to default (4 levels)
The super() method can only be invoked from within a function (otherwise it will throw an error). It will only work on instances of classes that use a classical prototypal inheritance model.
uSuper() is designed for use on classes that use a classical prototypal inheritance model – specifically, the sort that function.inherit() sets up.
It must only be called from within a function.
Contents
Jump to:
Inheritance Model
Topics:
- object.super() — Call a superclass method or constructor from within the class method (of same name) or constructor.
- function.inherit() — Simplifies the implementation and use of classical Javascript prototypal inheritance.