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Basic JavaScript: ()(); [duplicate]

Possible Duplicate:
javascript function vs. ( function() { … } ());

Sorry if this is too basic, but what is this construct do?

(function MyFunction() {
  /* Some codes ... */    
})();

Maybe there is a special term for that? It can be useful for Googling, instead of just putting that snippet in the search field.

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Correct minor typos or mistakes
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create code fences with backticks ` or tildes ~
```
like so
```
add language identifier to highlight code
```python
def function(foo):
print(foo)
```
put returns between paragraphs
for linebreak add 2 spaces at end
_italic_ or **bold**
indent code by 4 spaces
backtick escapes `like _so_`
quote by placing > at start of line
to make links (use https whenever possible)

<https://example.com>

[example](https://example.com)

<a href="https://example.com">example</a>

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Basic JavaScript: ()(); [duplicate]

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