How to HACK JavaScript with Well-Known Symbols

Highlights: New puzzle, more web dev tools, and Well-Known Symbols

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Can you solve this puzzle?

Some serious string manipulation going on here! Before the real math even starts.

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They call them well-known symbols – even though most developers have never used them or even heard of them.

They’re a really cool feature you can use to make magic like this happen:

You’ll see how we built the List class with a well-known symbol to do this.

They’re all about completely customizing the normal behavior of built-in operations like for..of. It’s like operator overloading in C++ and C#.

Also all static methods of the Symbol class.

So first up we have Symbol.hasInstance: for easily changing how the instanceof operator behaves.

Normally instanceof is all about checking if a variable is an instance of class.

This is as it should be. Pretty standard stuff.

But with Symbol.hasInstance we can completely transform how instanceof works:

 

Now a Person is no longer a Person, as far as instanceof is concerned.

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