Is this an ES6 Symbol value?
```js var isSymbol = require('is-symbol'); assert(!isSymbol(function () {})); assert(!isSymbol(null)); assert(!isSymbol(function* () { yield 42; return Infinity; });
assert(isSymbol(Symbol.iterator)); assert(isSymbol(Symbol('foo'))); assert(isSymbol(Symbol.for('foo'))); assert(isSymbol(Object(Symbol('foo')))); ```
Simply clone the repo, npm install
, and run npm test