CODE EXAMPLE FOR JAVASCRIPT

Symbol Properties javascript

const x = Symbol('hey');

// description property
console.log(x.description); // hey

const stringArray = ['a', 'b', 'c'];
const numberArray = [1, 2, 3];

// isConcatSpreadable property
numberArray[Symbol.isConcatSpreadable] = false;

let result = stringArray.concat(numberArray);
console.log(result); // ["a", "b", "c", [1, 2, 3]]