async vs. non comparison (ES2017)

comparison.js

function newDecodedSourceSync(audioData) {
  return new Promise((resolve) => {
    const audioCtx = new AudioContext();

    audioCtx.decodeAudioData(audioData, buffer => {
      const source = createBufferSource(audioCtx, buffer);

      resolve([audioCtx, buffer, source]);
    },
    (e) => `Error with decoding audio data ${e.err}`
    );
  });
}

async function newDecodedSource(audioData) {
  try {
    const context = new AudioContext();
    const buffer = await context.decodeAudioData(audioData);
    const source = createBufferSource(context, buffer);

    return [context, buffer, source];
  } catch(e) {
    throw new Error(`Error with decoding audio data ${e.err}`)
  }
}

[newDecodedSource, newDecodedSourceSync].forEach(fn =>
  fn(audioData).then(([context, buffer, source]) =>
    console.log(context, buffer, source)));