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Showing content from https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Symbol/toString below:

Symbol.prototype.toString() - JavaScript | MDN

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toString() 方法返回当前 symbol 对象的字符串表示。

Symbol 对象拥有自己的 toString 方法，因而遮蔽了原型链上的 Object.prototype.toString()。

symbol 原始值不能转换为字符串，所以只能先转换成它的包装对象，再调用 toString() 方法：

Symbol("foo") + "bar";
// TypeError: Can't convert symbol to string
Symbol("foo").toString() + "bar";
// "Symbol(foo)bar"，就相当于下面的：
Object(Symbol("foo")).toString() + "bar";
// "Symbol(foo)bar"

Symbol("desc").toString(); // "Symbol(desc)"

// 内置通用（well-known）symbol
Symbol.iterator.toString(); // "Symbol(Symbol.iterator)

// global symbols
Symbol.for("foo").toString(); // "Symbol(foo)"

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