Handwriting sum: 31 JS basics async_await(asyncToGenerator).js call.js flat.js flatMap.js flatPro.ts inherit.js instanceof.js map(reduce).js new.js Obecjt.create.js Promise.js promiseAll.js promiseRace.js String.prototype.trim.ts operate easy_v-model.js utils compose.ts debounce.js deepClone.js delay.ts fetchPro.js flatArrToJSONTree.ts getType.ts getUrlParams.js lazySum.js once.ts sample.ts sleep.ts throttle.js