Sure! Here are examples of the Maybe monad in JavaScript and C#:

JavaScript:

class Maybe {
  constructor(value) {
    this.value = value;
  }

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

  map(fn) {
    return this.value === null || this.value === undefined
      ? Maybe.of(null)
      : Maybe.of(fn(this.value));
  }

  join() {
    return this.value === null || this.value === undefined
      ? Maybe.of(null)
      : this.value;
  }

  chain(fn) {
    return this.map(fn).join();
  }
}


C#:

public class Maybe<T>
{
    public T Value { get; }

    private Maybe(T value)
    {
        Value = value;
    }

    public static Maybe<T> Of(T value)
    {
        return value == null ? new Maybe<T>(value) : None;
    }

    public static readonly Maybe<T> None = new Maybe<T>(default(T));

    public Maybe<U> Map<U>(Func<T, U> map)
    {
        return this == None ? None : Of(map(Value));
    }

    public Maybe<U> Bind<U>(Func<T, Maybe<U>> bind)
    {
        return this == None ? None : bind(Value);
    }
}

Note that in both examples, the Maybe monad is implemented as a wrapper type around an optional value. The map and chain methods provide a way to transform the value and sequence operations, respectively, while abstracting away the details of handling missing values.
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