Function isFunction

lib/web/polyfill.js:79–81

(it)

  return it !== null && (typeof it == 'object' || typeof it == 'function');
}
function isFunction(it){
  return typeof it == 'function';
}
// Native function?
var isNative = ctx(/./.test, /\[native code\]\s*\}\s*$/, 1);