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Merge pull request #84 from otomer/patch-1

Update README.md (isArray)

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`@@ -1352,6 +1352,27 @@ function(value){`
`1352`	`1352`	`}`
`1353`	`1353`	```
`1354`	`1354`
	`1355`	`+Method 4:`
	`1356`	`+`
	`1357`	`+You can query the constructor name:`
	`1358`	`+`
	`1359`	+```javascript
	`1360`	`+function isArray(value) {`
	`1361`	`+ return value.constructor.name === "Array";`
	`1362`	`+}`
	`1363`	`+`
	`1364`	+```
	`1365`	`+`
	`1366`	`+Method 5:`
	`1367`	`+`
	`1368`	+You check if a given value is an `instanceof Array`:
	`1369`	`+`
	`1370`	+```javascript
	`1371`	`+function isArray(value) {`
	`1372`	`+ return value instanceof Array;`
	`1373`	`+}`
	`1374`	+```
	`1375`	`+`
`1355`	`1376`	`## Question 37. Best way to detect reference values of any type in JavaScript ?`
`1356`	`1377`
`1357`	`1378`	`In Javascript Object are called as reference type, Any value other then primitive is definitely a reference type. There are several built-in reference type such as Object, Array, Function, Date, null and Error.`

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