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Callbacks vs. Promises vs. Async

Callbacks vs. Promises vs. Async

Get a refresher on the concepts of callbacks, promises, and async side by side.

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As a refresher on the techniques that we have explored, let’s compare the techniques used when using callbacks, Promises, and async await all in one go.

Callback

First up, the callback syntax is as follows:

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callback_vs_promise_vs_async.ts
tsconfig.json
{
    "compilerOptions": {
        "target": "ES2015",
        "module": "commonjs",
        "strict": false,
        "esModuleInterop": true,
        "skipLibCheck": true,
        "forceConsistentCasingInFileNames": true
    }
}

Here, we define a function named usingCallbacks. Within this function, we define two more functions named afterCallbackSuccess and ...