What is difference of "Array" & "Object" in JS. I know only that:
var variable=[1, 2, 3, "Array"]
var varibale1={Fist:1, Second:"Some String", Third:"Object"}
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stackoverflow.com/questions/874205/…Krishna Chandran– Krishna Chandran2015-08-02 06:20:43 +00:00Commented Aug 2, 2015 at 6:20
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2 Answers
If you compare "Array" with "Object", you should see the following similarities and differences:
- "Array" is subclass, or sub-prototype, of "Object". So "Array" inherits all features from "Object".
- "Array" is not a new data type. "Array" and "Object" are sharing the same data type "object".
- The "typeof" operator on an "Array" object returns "object".
- The "instanceof" operator on an "Array" object matches "Array". It also matches "Object", because "Array" is a subclass of "Object".
- An object of "Object" can have indexed properties using the same syntax as "Array" objects.
- An object of "Object" is not an object of "Array".
- An object of "Array" is also an object of "Object".
Source: http://www.herongyang.com/JavaScript/Object-Compare-Array-Object-Difference.html
Comments
For beginners, it is just two different ways of organizing data. Arrays are ordered lists, whereas objects contain key-value pairs. This difference is important because when you want to access or set the data, for arrays you use indices like variable[0] to get the first item. For objects, however, you would have to do variable1["First"] or variable1.First
