code: function createDomainFunction(getDomainFromDataFunction, formatDomainFunction) {
    getDomainFromDataFunction = isFunction(getDomainFromDataFunction)
      ? getDomainFromDataFunction
      : getDomainFromData;
    formatDomainFunction = isFunction(formatDomainFunction) ? formatDomainFunction : formatDomain;
    return (props, axis) => {
      const propsDomain = getDomainFromProps(props, axis);
      if (propsDomain) {
        return formatDomainFunction(propsDomain, props, axis);
      }
      const categories = Data.getCategories(props, axis);
      const domain = categories
        ? getDomainFromCategories(props, axis, categories)
        : getDomainFromDataFunction(props, axis);
      return domain ? formatDomainFunction(domain, props, axis) : undefined;
    };
  }
docs: Public Methods 
  Returns a getDomain function
  @param {Function} getDomainFromDataFunction: a function that takes props and axis and
  returns a domain based on data
  @param {Function} formatDomainFunction: a function that takes domain, props, and axis and
  returns a formatted domain
  @returns {Function} a function that takes props and axis and returns a formatted domain