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/**
 * Check if the given variable is a function
 * @method
 * @memberof Popper.Utils
 * @argument {Any} functionToCheck - variable to check
 * @returns {Boolean} answer to: is a function?
 */
export default function isFunction(functionToCheck) {
  const getType = {};
  return (
    functionToCheck &&
    getType.toString.call(functionToCheck) === '[object Function]'
  );
}