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Array() as default callback

JavaScript
Node.js

Posted at 2017-06-28

const doSomethingSync = (params, callback = Array) => {
  if (!validate(params)) {
    return callback(new Error(), null);
  }

  const result = calc(params);
  return callback(null, result);
};

// Retrieve as returning values.
const [err, result] = doSomethingSync(params);

// Retrieve with node-style callback.
doSomethingSync(params, (err, result) => { });

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