JS Fundamentals Cheatsheet

Object.keys() v.s. Object.getOwnPropertyNames()

When talking about Object’s properties, there are two types, namely enumerable one and unenumerable one. It is called enumerability of properties 1. ‘enumerable properties are ones whose internal [[Enumerable]] flag is set true, which is default for properties created via simple assignment or via a property initializer’.

Object.keys() will return all enumerable properties of an object and getOwnPropertyNames will return both enumerable and nonenumerable properties.

What’s closure in JS

What’s event loop

When var t = 'abc', what would happen in compiler

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