A monad demo given by AI

// Generic Monad structure
class Monad {
  constructor(value) {
    this.value = value;
  }

  // Bind: chains computations that return a Monad
  bind(fn) {
    return fn(this.value);
  }

  // Unit: wraps a value in the Monad
  static of(value) {
    return new Monad(value);
  }

  // For debugging
  get() {
    return this.value;
  }
}

// Example: Maybe Monad
class Maybe extends Monad {
  bind(fn) {
    if (this.value == null) {
      return new Maybe(null);
    }
    return fn(this.value);
  }

  static of(value) {
    return new Maybe(value);
  }

  getOrElse(defaultValue) {
    return this.value == null ? defaultValue : this.value;
  }
}

// Demo: chaining computations with Monad
const double = x => Monad.of(x * 2);
const increment = x => Monad.of(x + 1);

const result = Monad.of(5)
  .bind(double)      // 10
  .bind(increment);  // 11

console.log(result.get()); // Output: 11

// Demo: chaining with Maybe Monad
const safeDivide = x => x === 0 ? Maybe.of(null) : Maybe.of(10 / x);

const maybeResult = Maybe.of(2)
  .bind(safeDivide)       // 10 / 2 = 5
  .bind(x => Maybe.of(x + 3)); // 8

console.log(maybeResult.getOrElse("fail")); // Output: 8

const maybeFail = Maybe.of(0)
  .bind(safeDivide)       // null
  .bind(x => Maybe.of(x + 3));

console.log(maybeFail.getOrElse("fail")); // Output: "fail"

作者： 曾小乱

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