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Finding a complexity for a program is always an important task. It gives us clear indication of how much slower or faster our program will get when you give more data input at it.

In Functional JavaScript a Pure Function is a function that doesn’t depend on anything outside of it’s scope nor modify it.

The Intl object provides access to several constructors, each of them allows to do string comparison, number formatting and date and time formatting.

An expression is any valid set of literals, variables, operators that evaluates to a single value.

In JavaScript undefined & null sound like same, but they are different.

JavaScript is a prototype based language. The term Prototype is another important topic of JavaScript. Without knowing it, we can’t understand the underlying structure of a reference typed JavaScript code.