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73

answers:

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For Ruby, we have irb. For Python, we have IDLE. For Javascrpt, is Firebug or Chrome on a blank page the best way to run or test Javascript interactively?

+5  A: 

You can also visit JSBin or JSFiddle.

On the iPhone, there is JSanywhere (it seems written by a Japanese author).

There is not much information about it on Google in English, but it can be downloaded for free from the App Store.

alex
+1 for the JSFiddle plug
Matthew J Morrison
JSBin and JSFiddle are really nice too. JSConsole might be closer to an interactive console like irb or IDLE.
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+4  A: 

In addition to the alternatives already mentioned by @alex:

On the browser:

Both with basic auto-completion.

Standalone consoles:

CMS
JSConsole is really good because it can show the whole object's content, like Ruby's inspect() or what is shown in irb
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