In the JavaScript world, almost everything you see is an object. If you understand objects, you understand Javascript. There are lots of static methods where you can create objects, copy objects, seal ...

The reduce() method takes two parameters: a callback function and an optional initial value. In the callback function, it takes an accumulator as its first parameter and the value of the current array ...

Most methods are async by default. All async methods will return a promise if the callback isn't passed. Sync methods on the other hand will throw if an error occurs ...