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Developer builds custom JavaScript EventEmitter from scratch to understand internals

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A developer explored how Node.js EventEmitters work by constructing a simplified version from scratch in plain JavaScript. EventEmitters allow programmers to define and trigger custom events programmatically, unlike browser UI events such as clicks. The custom implementation uses a Map to store event labels and their associated callbacks, with each callback tracked by a unique ID. A boolean 'once' flag is also supported to allow callbacks that fire only a single time. The author was motivated by practical experience using event-driven patterns in an asynchronous video transformer project.

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