Try functional data type

try.js

class Try {
  constructor(val) {
    this._val = val;
  }

  static of(fn) {
    try {
      return new Success(fn());
    } catch (err) {
      return new Failure(err);
    }
  }

  map(fn) {
    return Try.of(() => fn(this._val));
  }
}

class Success extends Try {
  getOrElse(other) {
    return this._val;
  }

  getOrElseThrow() {
    return this._val;
  }
}

class Failure extends Try {
  map(fn) {
    return this;
  }

  getOrElse(other) {
    return other;
  }

  getOrElseThrow() {
    if(this._val !== null) {
      throw this._val;
    }
  }
}

// Main
let record = Try.of(() => findRecordById('123'))
                .map(processRecord)
                .getOrElse(new Record('123', 'RecordA'));