JavaScript Symbols MasterClass // The Missing Guide

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Chapters
0:00 Symbol Fundamentals
1:05 Symbol as Object Key
2:06 Not Enumerable
3:08 Safe Extension Of Objects
4:14 Well Known Symbols
6:03 Symbol Sharing

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[victoryamadi]

I almost went crazy trying to understand this concept. Thanks man!

[VforVanish]

Rarely usefull but still very interesting to know, thank you!

[beriu]

I've been following Basarat for some years now, let me tell you about this guy, sometimes he decides to just DROP KNOWLEDGE, this is one of those cases!

[nisabmohd]

Hey basarath I have one doubt why we call symbol refrence though it's a primitive type

[marslogics]

A symbolic episode indeed. Thank you, basarat, for demystifying Symbols

There are many system symbols used by JavaScript that are accessible as Symbol.*. We can use them to alter some built-in behaviors. For instance, we can use Symbol.iterator for iterables, Symbol.toPrimitive to set up object-to-primitive conversion like when you do Obj1 + Obj2 or Obj1-Obj2.