Node.js Event Emitter to Async/Await: Simplified Code Example

{"title":"Node.js Event Emitter to Async/Await: Simplified Code Example", "description":"Learn how to convert Node.js event emitter code into a more readable and maintainable asynchronous structure using async/await. This guide provides a clear example and explains the process step-by-step.", "keywords":"nodejs, async await, event emitter, javascript, asynchronous programming, promise, code example, tutorial", "content":""以下是将代码改写为async/await的写法：\n\nconst EventEmitter = require('events');\n\nclass MyEmitter extends EventEmitter {}\n\nconst fetchData = () => {\n return new Promise((resolve, reject) => {\n setTimeout(() => {\n resolve('Data fetched successfully!');\n }, 2000);\n });\n}\n\nconst processData = (data) => {\n return new Promise((resolve, reject) => {\n setTimeout(() => {\n resolve(data + '\tAnd Data processed successfully!');\n }, 2000);\n });\n}\n\nconst run = async () => {\n const myEmitter = new MyEmitter();\n\n myEmitter.on('fetchData', async () => {\n const result = await fetchData();\n myEmitter.emit('dataFetched', result);\n });\n\n myEmitter.on('dataFetched', async (result) => {\n console.log(result);\n myEmitter.emit('processData', result);\n });\n\n myEmitter.on('processData', async (data) => {\n const processedResult = await processData(data);\n myEmitter.emit('dataProcessed', processedResult);\n });\n\n myEmitter.on('dataProcessed', async (processedResult) => {\n console.log(processedResult);\n });\n\n myEmitter.emit('fetchData');\n}\n\nrun().catch((error) => {\n console.error(error);\n});\n"\