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annotate core-javascript/exercise-2.rst @ 213:0ea90a1819c2 default tip

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author Radomir Dopieralski <radomir.dopieralski@allegro.pl>
date Wed, 27 Jun 2012 16:35:54 +0200
parents 58e4f484903f
children
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1 Exercise two
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2 ============
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3
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4 Here's some more JavaScript code I found. I've changed the names of
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5 everything to hide the origin of the code. But it's not something
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6 I've made up.
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7
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8 .. literalinclude:: /core-javascript-work/exercise-2.js
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9 :language: javascript
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10
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11 The exercise is
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12
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13 #. Rewrite the function copy_attributes so that it makes a loop over
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14
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15 .. code-block:: javascript
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16
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17 var keys = ['aaa', 'bbb', 'ccc', 'ddd', 'eee', 'fff', 'ggg', 'hhh'];
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18
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19 #. Write a copy_attributes_factory function so that we can write
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20
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21 .. code-block:: javascript
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22
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23 var copy_attributes = copy_attributes_factory(keys);
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24
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25 #. Write a Fields class such that something like this will work:
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26
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27 .. code-block:: javascript
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28
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29 var aaa = Fields(keys);
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30 aaa.copy_attributes(src, tgt);
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31
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32
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33 Hints
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34 -----
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35
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36 #. In JavaScript attribute access and item access are the same.
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37 First we use item access to set:
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38
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39 .. code-block:: javascript
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40
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41 js> a = {}
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42 [object Object]
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43 js> key = 'attrname'
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44 attrname
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45 js> a[key] = 42
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46 42
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47
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48 and then we use attribute access to get:
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49
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50 .. code-block:: javascript
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51
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52 js> a.attrname
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53 42
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54
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55 #. This applies even for function (aka method) calls.
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56
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57 #. Have the factory function store the keys in a closure.
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59 #. There are many ways of writing Fields. Choose one that suits you.