fc-result

Description

npm install fc-result

fc-result wraps your function and returns a function that will return a Result when called.

A result can be either Ok or Fail.

To get the return value of the function call simply extract the value using the value property, result.value.

A result function will return Ok if the function was called without throwing an Error and it will return Fail if the function threw an Error

This will allow for code such as:

  const { Result, Ok, Fail } = require("fc-result");

  const sum = (a, b) => a + b;

  const fail = () => {
    throw new Error("fail");
  };

  const sumResult = Result(sum);
  const failResult = Result(fail);

  [sumResult(1, 1), failResult()].forEach(result => {
    switch (result.constructor) {
      case Ok:
        console.log("This was a OK", result);
        console.log("--------------------------");
        break;

      case Fail:
        console.log("This was a Fail", result);
        console.log("--------------------------");
        break;

      default:
        console.log("wtf");
        console.log("--------------------------");
        break;
    }
  });

Result API

Result

  const sum = (a, b) => a + b;
  const sumResult = Result(sum);
  const mySum = sumResult(1, 1).value;

Result.ok / Result.fail

  const myFunc = val => {
    if (val === 1) {
      return Result.ok(val);
    } else {
      return Result.fail(new Error("val was not 1"));
    }
  };

Result.resultify

  class MyClass {
    sum(a, b) {
      return a + b;
    }

    fail() {
      throw new Error("fail");
    }
  }

  const myObject = Result.resultify(new MyClass());

  [myObject.sum(1, 1), myObject.fail()].forEach(result => {
    switch (result.constructor) {
      case Ok:
        console.log("This was a OK", result);
        console.log("--------------------------");
        break;

      case Fail:
        console.log("This was a Fail", result);
        console.log("--------------------------");
        break;

      default:
        console.log("wtf");
        console.log("--------------------------");
        break;
    }
  });

result.isOk

  const sum = (a, b) => a + b;
  
  const fail = () => {
    throw new Error("fail");
  };
  
  const sumResult = Result(sum);
  const failResult = Result(fail);
  
  [sumResult(1, 1), failResult()].forEach(result => {
    if (result.isOk()) {
      console.log("This was a OK", result);
      console.log("--------------------------");
    } else {
      console.log("This was a Fail", result);
      console.log("--------------------------");
    }
  });