Maybs

My take on a maybe monad for JavaScript after reading this. It may or may not actually be correct, but it is useful.

Maybs works by providing a wrapping a value, and providing methods to access its properties. It's handy for digging deep into an object without making null checks along the way.

var maybe = require('maybs');
 
var val = {
  aValue: {
    aNestedValue: 123
  },
  aFunction: function add(a, b) {
    return a + b;
  }
};
 
maybe(val).get('aValue').value();
// >> { aNestedValue: 123 }
 
maybe(val).get('aValue').get('aNestedValue').value();
// >> 123
 
maybe(val).call('aFunction', 1, 2);
// >> 3
 
maybe(val).apply('aFunction', [1, 2]);
// >> 3
 
maybe(val)
  .get('aValue')
  .get('notThere')
  .get('somethingeEse')
  .call('nonExistantFunction', 1, 2, 3)
  .value()
// >> undefined

#get(key)

Returns a new Maybe wrapper for the value's key (or nothing).

#call(key, arg1, arg2...)

Tries to call valuekey and returns the result wrapped in a new Maybe.

#apply(key, [arg1, arg2...])

Tries to call valuekey and returns the result wrapped in a new Maybe.

value()

Unwrap the Maybe, returns the value or undefined.