didil/asyncConcatService.js

## asyncConcatService.js
function concat(a, b) {
  return new Promise((resolve, reject) => {
    setImmediate(() => resolve(`${a} ${b}`));
  });
}

module.exports = {
  concat
};
	function concat(a, b) {
	return new Promise((resolve, reject) => {
	setImmediate(() => resolve(`${a} ${b}`));
	});
	}

	module.exports = {
	concat
	};