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Symbols.md

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symbols:

  • A new JS primitive data type.(number, string, boolean, null, undefined, symbol)
  • is "unique, and immutable data type that is used to identify object properties".
  • created by invoking Symbol() function.
  • Symbol('description') function can have an optional string description that is used for debugging.
  • Description is a way to describe the created symbol. It can not access the symbol or affect its value. That's why the symbols with the same description are not equal.
  • syntax: 
    const bowl = {
[Symbol('apple')]: { color: 'red', weight: 136.078 },
[Symbol('banana')]: { color: 'yellow', weight: 183.15 },
[Symbol('orange')]: { color: 'orange', weight: 170.097 },
[Symbol('banana')]: { color: 'yellow', weight: 176.845 }
};
console.log(bowl);//{Symbol(apple): {…}, Symbol(banana): {…}, Symbol(orange): {…}, Symbol(banana): {…}}