UPDATE: Recently a brilliant article from Mozilla came up. Read it if you're curious.   As you may know they are planning to include new Symbol primitive type in ECMAScript 6 (not to mention some other crazy stuff). I always thought that the...

I just stumbled upon the documentation for the new (proposed for ES6, but already implemented in Firefox, Chrome & Opera) datatype in JavaScript, Symbol:  https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Symbol htt...

It took me a while but I finally figured out what the purpose of symbols in ECMAScript 6 is: avoiding name collision when attaching properties to shared objects - HTML elements e.g. (In case you're stuck on the same question, I recommend this art...

What is the point of the 'Symbol' type in ECMA-262-v6? Fast path implementation for object keys? What does it do under the hood - hash it with the guarantee that the underlying data is immutable?...

Let's take the following code:  var obj = {}; var x = Symbol(); Object.defineProperties(obj, {   [x]: {     value: true,     writable: true   },   "property2": {     value: "Hello",     writable: false   }   // etc. etc. }); conso...

I'm trying to define an object with a symbol as key-type since MDN says:     A symbol value may be used as an identifier for object properties [...]    But using it as type for the key-property:   type obj = {     [key: symbol | string]: string }...

I've been around the block when it comes to languages, having worked with everything from C# to Lisp to Scala to Haskell, and in every language that supported them, symbols have acted pretty much the same; that is, any two symbols with the same n...

How can I check if a value is Symbol in JS?  I do not see a Symbol.isSymbol() method. My test of (x instanceof Symbol) does not seem to work either....

I wonder if there is a nice way to get the descriptions of a Symbol.  For example,  var s = Symbol(5);   The default implementation of the toString will simply print      Symbol(5)  I would like to find a way to extract the actual description i.e. 5...

Where can I find the list of symbols made available to us by d3.js  which is referred by this line of code:   d3.svg.symbol().type(/*Name of the symbol type that is available to us to use*/'triangle')   Some of the available symbols include t...