Showing posts from January, 2017

Things you may not know about Javascript Objects

Object Properties:An Object is a non primitive data with collection of properties(key, value). Each property(key) of an Object has following configurable properties,
value - value of the property. Default: undefinedenumerable - if true, the property can be accessed using a loop and Object.keys. Default: falsewritable - if true, the property value can be modified. Default: falseget- defines a getter function. Default: undefinedset - defines a setter function. Default: undefinedconfigurable - if true, all the properties can be modified and deleted. Default: falseWith Object.defineProperty and Object.definePropertieswe can set the above configurable properties for an Object property(key).
With Object.getOwnPropertyDescriptor and Object.getOwnPropertyDescriptors we can get the above configurable properties associated with an Object property(key).example:var x = { a:1, b:2 }; Object.getOwnPropertyDescriptor(x, 'a'); // {value: 1, writable: true, enumerable: true, configurab…