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116
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1 Getting started
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2 ===============
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3
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4 What you need
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5 -------------
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6
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7 You'll need on your machine
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8
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9 #. A JavaScript interpreter which provides a command line
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10
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11 #. An editor on your machine.
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12
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13 You'll also to download and unzip the course :download:`work folder
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14 </core-javascript-work.zip>`.
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15
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16
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17 Windows and Linux
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18 -----------------
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19
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20 For Windows the easiest thing to do is to `download the JSDB
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21 interpreter <http://www.jsdb.org/download.html>`_, and use notepad (or
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22 some other editor).
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23
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24 For Linux you and install Rhino and use your favourite editor.
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25
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26 .. code-block:: sh
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27
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28 $ sudo apt-get install rhino
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29
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30
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31 Are you ready?
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32 --------------
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33
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34 You'll want to be able to run the JavaScript interpreter from the
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35 command line when in the work folder. This will be automatic (via the
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36 PATH) with Linux and Rhino. For Windows the easiest thing to do is to
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37 place the jsdb.exe file in the work folder.
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38
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39 When you're ready type *js* at a command prompt. This starts the
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40 interpreter and gives you a *js>* prompt. You'll get something like
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41 this.
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42
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43 .. code-block:: javascript
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44
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45 core-javascript-work$ js
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46 Rhino 1.7 release 2 2010 01 20
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47 js>
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48
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49 Now type the command as below at the JavaScript prompt (with Return at the end of
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50 each line) and you'll get responses as below.
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51
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52
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53 .. code-block:: javascript
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54
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55 js> a = '0'
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56 0
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57 js> b = 0
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58 0
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59 js> c = ''
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60
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61 js> a == b
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62 true
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63 js> b == c
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64 true
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65 js> a == c
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66 false
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67
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68
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69 You might be surprised by the last response from the interpreter, but
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70 every JavaScript interpreter does this.
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71
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72
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73 Yes, you're ready
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74 -----------------
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75
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76 To exit the interpreter use Ctrl-C or Ctrl-D.
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