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let sy = Symbol("KK");
console.log(sy);   // Symbol(KK)
typeof(sy);        // "symbol"

// The same parameter Symbol() returns different values
let sy1 = Symbol("kk");
sy === sy1;       // false

let sy = Symbol("key1");

// Method 1
let syObject = {};
syObject[sy] = "kk";
console.log(syObject);    // {Symbol(key1): "kk"}

// Method 2
let syObject = {
  [sy]: "kk"
};
console.log(syObject);    // {Symbol(key1): "kk"}

// Method 3
let syObject = {};
Object.defineProperty(syObject, sy, {value: "kk"});
console.log(syObject);   // {Symbol(key1): "kk"}

let syObject = {};
syObject[sy] = "kk";

syObject[sy];  // "kk"
syObject.sy;   // undefined

let syObject = {};
syObject[sy] = "kk";
console.log(syObject);

for (let i in syObject) {
  console.log(i);
}    // No output

Object.keys(syObject);                     // []
Object.getOwnPropertySymbols(syObject);    // [Symbol(key1)]
Reflect.ownKeys(syObject);                 // [Symbol(key1)]

const COLOR_RED = "red";
const COLOR_YELLOW = "yellow";
const COLOR_BLUE = "blue";

const COLOR_RED = "red";
const COLOR_YELLOW = "yellow";
const COLOR_BLUE = "blue";
const MY_BLUE = "blue";

function ColorException(message) {
   this.message = message;
   this.name = "ColorException";
}

function getConstantName(color) {
    switch (color) {
        case COLOR_RED :
            return "COLOR_RED";
        case COLOR_YELLOW :
            return "COLOR_YELLOW ";
        case COLOR_BLUE:
            return "COLOR_BLUE";
        case MY_BLUE:
            return "MY_BLUE";         
        default:
            throw new ColorException("Can't find this color");
    }
}

try {

   var color = "green"; // green triggers an exception
   var colorName = getConstantName(color);
} catch (e) {
   var colorName = "unknown";
   console.log(e.message, e.name); // Pass the exception object to error handling
}