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Some fixes in example section of Javascript documentation.

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This commit is contained in:
Oliver Buchtala 2014-02-20 12:38:53 +01:00
commit 84ba91dc63
1 changed files with 27 additions and 13 deletions
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Doc/Manual/Javascript.md
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@ -292,7 +292,7 @@ Global methods and variables are available in the scope of the module.
### Class ### Class
The common example `class` looks defines three classes, `Shape`, `Circle`, and `Square`: The common example `class` defines three classes, `Shape`, `Circle`, and `Square`:
class Shape { class Shape {
public: public:
@ -327,12 +327,14 @@ The common example `class` looks defines three classes, `Shape`, `Circle`, and `
virtual double perimeter(void); virtual double perimeter(void);
}; };
`Circle` and `Square` inherit from `Shape`. `Shape` has a static variable a function `move` `Circle` and `Square` inherit from `Shape`. `Shape` has a static variable `nshapes`,
that can't be overridden (non-virtual) and two abstract functions `area` and `perimeter` (pure virtual) that must be overridden by the sub-classes. a function `move` that can't be overridden (non-virtual),
and two abstract functions `area` and `perimeter` (pure virtual) that must be
overridden by the sub-classes.
A `nodejs` extension is built the same way as for the `simple` example. A `nodejs` extension is built the same way as for the `simple` example.
From Javascript this extension can be used this way: In javascript it can be used this way:
var example = require("./build/Release/example"); var example = require("./build/Release/example");
@ -342,27 +344,29 @@ From Javascript this extension can be used this way:
var Circle = example.Circle; var Circle = example.Circle;
var Square = example.Square; var Square = example.Square;
// Creating new instances using the 'new' operator // creating new instances using the 'new' operator
var c = new Circle(10); var c = new Circle(10);
var s = new Square(10); var s = new Square(10);
// Accessing a static member // accessing a static member
var nshapes = Shape.nshapes; Shape.nshapes;
// Accessing member variables // accessing member variables
c.x = 20; c.x = 20;
c.y = 30; c.y = 30;
s.x = -10; s.x = -10;
s.y = 5; s.y = 5;
// Calling some methods ----- // calling some methods
c.area(); c.area();
c.perimeter(); c.perimeter();
s.area(); s.area();
s.perimeter(); s.perimeter();
// instantiation of Shape is not permitted
new Shape();
Running these commands in an interactive node shell result in this output: Running these commands in an interactive node shell results in the following output:
$ node -i $ node -i
> var example = require("./build/Release/example"); > var example = require("./build/Release/example");
@ -377,8 +381,6 @@ Running these commands in an interactive node shell result in this output:
undefined undefined
> var s = new Square(10); > var s = new Square(10);
undefined undefined
> var nshapes = Shape.nshapes;
undefined
> Shape.nshapes; > Shape.nshapes;
2 2
> c.x = 20; > c.x = 20;
@ -403,7 +405,19 @@ Running these commands in an interactive node shell result in this output:
60 60
> c.y > c.y
70 70
> > new Shape()
Error: Class Shape can not be instantiated
at repl:1:2
at REPLServer.self.eval (repl.js:110:21)
at Interface.<anonymous> (repl.js:239:12)
at Interface.EventEmitter.emit (events.js:95:17)
at Interface._onLine (readline.js:202:10)
at Interface._line (readline.js:531:8)
at Interface._ttyWrite (readline.js:760:14)
at ReadStream.onkeypress (readline.js:99:10)
at ReadStream.EventEmitter.emit (events.js:98:17)
at emitKey (readline.js:1095:12)
> Note: In ECMAScript 5 there is no concept for classes. > Note: In ECMAScript 5 there is no concept for classes.
Instead each function can be used as a constructor function which is executed by the 'new' Instead each function can be used as a constructor function which is executed by the 'new'