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comparison core-javascript/simple-classes.rst @ 207:29c7fe19aeb5

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author Radomir Dopieralski <radomir.dopieralski@allegro.pl>
date Thu, 17 May 2012 11:24:48 +0200
parents fef162a89a47
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206:a2fb6c95d156 207:29c7fe19aeb5
5 inheritance. Almost all object-oriented languages have classes and 5 inheritance. Almost all object-oriented languages have classes and
6 instances, but JavaScript has neither. This will be explained later, 6 instances, but JavaScript has neither. This will be explained later,
7 along with a discussion of the consequences. 7 along with a discussion of the consequences.
8 8
9 For now our focus is on getting going with object-oriented 9 For now our focus is on getting going with object-oriented
10 programming. The easiest way to do this is via create. 10 programming. The easiest way to do this is via ``create``.
11 11
12 12
13 Definition 13 Definition
14 ---------- 14 ----------
15 15
16 Here's a factory function that creates classes. It returns a function 16 Here's a factory function that creates classes. It returns a function
17 called *cls*, which in turn when called returns instances. At it's 17 called ``cls``, which in turn when called returns instances. At it's
18 heart is *create*, and also *apply* and *arguments*, which we've not 18 heart is ``create``, and also ``apply`` and ``arguments``, which we've not
19 seen before). 19 seen before).
20 20
21 .. literalinclude:: /core-javascript-work/library.js 21 .. literalinclude:: /core-javascript-work/library.js
22 :language: javascript 22 :language: javascript
23 :start-after: start SimpleClass 23 :start-after: start SimpleClass
35 35
36 36
37 Fruit example 37 Fruit example
38 ------------- 38 -------------
39 39
40 Here's an example of the use of *SimpleClass*. There's a bug in it, 40 Here's an example of the use of ``SimpleClass``. There's a bug in it,
41 and I've changed the test so it passes. Can you find the bug and fix 41 and I've changed the test so it passes. Can you find the bug and fix
42 the example? 42 the example?
43 43
44 .. literalinclude:: /core-javascript-work/test_library.js 44 .. literalinclude:: /core-javascript-work/test_library.js
45 :language: javascript 45 :language: javascript