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chaining

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Original file line number	Diff line number	Diff line change
`@@ -137,6 +137,7 @@ new SandBox('dependencies', 'here', function(box){`
`137`	`137`	`* passed in callback function is you isolated environment`
`138`	`138`	`* you initiate multiple Sandbox object and even nest them`
`139`	`139`	`* you can name the constructor appropriately (instead of Sandbox)`
	`140`	`+* YUI (now dead) used this`
`140`	`141`
`141`	`142`	`## implementing the sandbox pattern`
`142`	`143`
`@@ -162,3 +163,11 @@ new SandBox('dependencies', 'here', function(box){`
`162`	`163`	`* no real way to do it in ES5`
`163`	`164`	`* just naming convention: all caps, and also worth making sure they're static`
`164`	`165`	* ```const``` keyword coming in ES6
	`166`	`+`
	`167`	`+## chaining`
	`168`	`+`
	`169`	`+* methods (that may not have a meaningful return value) returning this`
	`170`	`+* allows calling methods in a chain in a single expression`
	`171`	`+* pros: save some typing, more concise, small and focused methods`
	`172`	`+* cons: may get a bit harder to debug - lot happening on a single line`
	`173`	`+* JQuery uses it`

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