``++Symbol++`` is a primitive type introduced in ECMAScript2015. Its instances are mainly used as unique property keys. An instance can only be created by using ``++Symbol++`` as a function. Using ``++Symbol++`` with the ``++new++`` operator will raise a ``++TypeError++``. == Noncompliant Code Example ---- const sym = new Symbol("foo"); // Noncompliant ---- == Compliant Solution ---- const sym = Symbol("foo"); ----