symbol typescript

// Symbol is a primitive data type of JavaScript, along with string, number,

// boolean, null and undefined. Symbols are immutable, and unique.

let sym2 = Symbol(“key”);

let sym3 = Symbol(“key”);

sym2 === sym3; // false, symbols are unique
// Just like strings, symbols can be used as keys for object properties.

const sym = Symbol();

let obj = {

  [sym]: “value”,

};

console.log(obj[sym]); // “value”
// Symbols can also be combined with computed property declarations to

// declare object properties and class members.

const getClassNameSymbol = Symbol();

class C {

  [getClassNameSymbol]() {

    return “C”;

  }

}

let c = new C();

let className = c[getClassNameSymbol](); // “C”