A mutable object for functional programming.

MutableObject.js

// Deliberately not using class because I want data to be private.
function MutableObject() {
  const data = {};

  const get = name => (name === undefined) ? data : data[name];
  const setObject = value => Object.assign(data, value);
  const setByFunction = fnc => fnc(this);
  const setNameValue = (name, value) => data[name] = value;
  const set = (a, b) => {
    if (typeof a === 'object') {
      setObject(a);
    } else if (typeof a === 'function') {
      setByFunction(a);
    } else {
      setNameValue(a, b);
    }
    return this;
  }

  this.get = get;
  this.set = set;
}

module.exports = MutableObject;