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private members with closures

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Original file line number	Diff line number	Diff line change
`@@ -50,3 +50,31 @@ function myFunction(){`
`50`	`50`	`* shorter to type module names afterwards`
`51`	`51`	`* deps in one place`
`52`	`52`	`* some minifiers won't shorten global var names`
	`53`	`+`
	`54`	`+## private members with closures`
	`55`	`+`
	`56`	`+* constructor function create a closure`
	`57`	`+* any variables part of constructor closure are not visible outside of it`
	`58`	`+`
	`59`	+```js
	`60`	`+function Person(){`
	`61`	`+ var secret = 'hey';`
	`62`	`+ return {`
	`63`	`+ doIt: function (){`
	`64`	`+ // can see secret`
	`65`	`+ }`
	`66`	`+ }`
	`67`	`+}`
	`68`	`+`
	`69`	`+var me = new Person();`
	`70`	`+me.secrect === undefined;`
	`71`	`+secret === undefined;`
	`72`	`+me.doIt(); //does it`
	`73`	+```
	`74`	`+`
	`75`	`+* privileged methods are the ones declared within the constructor`
	`76`	`+* privileged methods have access to private members`
	`77`	`+* old versions of Firefox allowed access to private scope`
	`78`	`+* internal arrays/objects are still modifiable via reference`
	`79`	`+* make sure you return a new object with only the properties needed by caller`
	`80`	`+* or copy your objects/arrays (with utility methods)`

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