How browser works

please refer the below link. it will give you most of the information.   https://www.html5rocks.com/en/tutorials/internals/howbrowserswork/

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Difference Between in and hasOwnProperty in javascript

Let me explain you briefly ⊕ in: basically its a keywork in javascript, it checks whether the  propreties there are not in the object as well as its prototype chain. If properties are there it returns true otherwise false. but ⊕ hasOwnProperty:  it is also a keyword in javascript, it checks for the prorperties only in … Continue reading Difference Between in and hasOwnProperty in javascript

typeof

typeof "text"  ---->   string typeof 123   ------      number typeof Nan  ------>  number typeof "123"------>  string typeof []------>  object typeof {}------>  object typeof null------>  object typeof false------>  boolean typeof true------>  boolean