Callback vs promise vs async await

.babelrc

{
  "presets": ["env"]
}

.gitignore

node_modules
*.swp
.idea

README.md

Compare async code in JS

There are various techniques in JS to deal with asynchronous code.

They differ mostly in terms of readability and probablity to fail on error handling. There are three examples in the repository:

• callback.js: In the last block we use two sideeffects. There is nested code involved and multiple places to deal with error handling. Given that managing the error handling can be quite hard.
• promise.js: Instead of handling the error manually we now defer part of that to promises. This allows us to have multiple promises active at the same time easily. Error handling is improved: You can throw errors now, but try catch still doesn't work, as the then callback is not in the same flow.
• async.js:

async.js

const sideEffect = async () => {
  const err = false;
  if (err) {
    throw "meh";
  }

  return 'value1';
};

const sideEffect2 = async () => {
  const err = false;
  if (err) {
    throw "meh";
  }

  return 'value2';
};

const main = async () => {
  try {
    const a = await sideEffect();
    const b = await sideEffect2();
    console.log(a, b);
  }
  catch (err) {
    console.error(err);
  }
}

main();

callback.js

const sideEffect = (cb) => {
  // Do sideffect.
  const err = false;
  if (err) {
    return cb(err);
  }
  cb(null, 'value');
};

const sideEffect2 = (cb) => {
  // Do sideffect.
  const err = false;
  if (err) {
    return cb(err);
  }
  cb(null, 'value2');
};

sideEffect((err, val1) => {
  if (err) {
    return console.error('meh');
  }
  sideEffect2((err, val2) => {
    if (err) {
      return console.error('meh');
    }
    console.log(val1, val2);
  });
});

package.json

{
  "name": "compare-async",
  "version": "1.0.0",
  "main": "index.js",
  "repository": {},
  "license": "MIT",
  "dependencies": {
    "babel-cli": "^6.26.0",
    "babel-preset-env": "^1.6.0",
    "promise": "^8.0.1"
  }
}

promise.js

import Promise from 'promise';

const sideEffect = () => {
  const err = false;
  if (err) {
    return Promise.reject('err');
  }
  return Promise.resolve('value1');
};

const sideEffect2 = () => {
  const err = false;
  if (err) {
    return Promise.reject('err');
  }
  return Promise.resolve('value2');
};

Promise.all([sideEffect(), sideEffect2()])
  .then((values) => {
    console.log(values[0], values[1]);
  })
  .catch(() => console.err('meh'));

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babel-plugin-transform-es2015-spread@^6.22.0:
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babel-plugin-transform-es2015-sticky-regex@^6.22.0:
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babel-plugin-transform-es2015-template-literals@^6.22.0:
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babel-plugin-transform-es2015-typeof-symbol@^6.23.0:
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babel-plugin-transform-es2015-unicode-regex@^6.22.0:
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babel-plugin-transform-exponentiation-operator@^6.22.0:
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babel-plugin-transform-regenerator@^6.22.0:
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babel-plugin-transform-strict-mode@^6.24.1:
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babel-polyfill@^6.26.0:
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babel-preset-env@^1.6.0:
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babel-register@^6.26.0:
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babel-runtime@^6.18.0, babel-runtime@^6.22.0, babel-runtime@^6.26.0:
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babel-template@^6.24.1, babel-template@^6.26.0:
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babel-traverse@^6.24.1, babel-traverse@^6.26.0:
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babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.26.0:
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babylon@^6.18.0:
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balanced-match@^1.0.0:
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bcrypt-pbkdf@^1.0.0:
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binary-extensions@^1.0.0:
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brace-expansion@^1.1.7:
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braces@^1.8.2:
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browserslist@^2.1.2:
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caniuse-lite@^1.0.30000718:
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caseless@~0.12.0:
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chalk@^1.1.3:
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chokidar@^1.6.1:
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co@^4.6.0:
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code-point-at@^1.0.0:
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combined-stream@^1.0.5, combined-stream@~1.0.5:
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commander@^2.11.0:
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console-control-strings@^1.0.0, console-control-strings@~1.1.0:
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convert-source-map@^1.5.0:
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core-js@^2.4.0, core-js@^2.5.0:
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dashdash@^1.12.0:
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debug@^2.2.0, debug@^2.6.8:
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deep-extend@~0.4.0:
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delayed-stream@~1.0.0:
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delegates@^1.0.0:
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detect-indent@^4.0.0:
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ecc-jsbn@~0.1.1:
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electron-to-chromium@^1.3.18:
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escape-string-regexp@^1.0.2:
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esutils@^2.0.2:
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expand-brackets@^0.1.4:
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extend@~3.0.0:
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filename-regex@^2.0.0:
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fill-range@^2.1.0:
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for-in@^1.0.1:
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forever-agent@~0.6.1:
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fs-readdir-recursive@^1.0.0:
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fstream-ignore@^1.0.5:
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fstream@^1.0.0, fstream@^1.0.10, fstream@^1.0.2:
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gauge@~2.7.3:
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glob-base@^0.3.0:
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regenerator-runtime@^0.10.5:
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regenerator-runtime@^0.11.0:
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regenerator-transform@^0.10.0:
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regex-cache@^0.4.2:
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regexpu-core@^2.0.0:
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regjsgen@^0.2.0:
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regjsparser@^0.1.4:
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remove-trailing-separator@^1.0.1:
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repeat-element@^1.1.2:
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repeat-string@^1.5.2:
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repeating@^2.0.0:
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request@^2.81.0:
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rimraf@2, rimraf@^2.5.1, rimraf@^2.6.1:
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safe-buffer@^5.0.1, safe-buffer@~5.1.0, safe-buffer@~5.1.1:
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semver@^5.3.0:
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set-blocking@~2.0.0:
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set-immediate-shim@^1.0.1:
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signal-exit@^3.0.0:
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slash@^1.0.0:
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source-map-support@^0.4.15:
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source-map@^0.5.6:
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sshpk@^1.7.0:
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string-width@^1.0.1, string-width@^1.0.2:
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string_decoder@~1.0.3:
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stringstream@~0.0.4:
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strip-ansi@^3.0.0, strip-ansi@^3.0.1:
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strip-json-comments@~2.0.1:
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supports-color@^2.0.0:
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tar-pack@^3.4.0:
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tar@^2.2.1:
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to-fast-properties@^1.0.3:
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tough-cookie@~2.3.0:
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trim-right@^1.0.1:
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tunnel-agent@^0.6.0:
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tweetnacl@^0.14.3, tweetnacl@~0.14.0:
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uid-number@^0.0.6:
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user-home@^1.1.1:
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util-deprecate@~1.0.1:
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uuid@^3.0.0:
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v8flags@^2.1.1:
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[email protected]:
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wide-align@^1.1.0:
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wrappy@1:
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