_ff-addon-snippet-validateOptionsObj - What I use to validae options

_ff-addon-snippet-validateOptionsObj.js

function validateOptionsObj(aOptions, aOptionsDefaults) {
	// ensures no invalid keys are found in aOptions, any key found in aOptions not having a key in aOptionsDefaults causes throw new Error as invalid option
	for (var aOptKey in aOptions) {
		if (!(aOptKey in aOptionsDefaults)) {
			console.error('aOptKey of ' + aOptKey + ' is an invalid key, as it has no default value, aOptionsDefaults:', aOptionsDefaults, 'aOptions:', aOptions);
			throw new Error('aOptKey of ' + aOptKey + ' is an invalid key, as it has no default value');
		}
	}
	
	// if a key is not found in aOptions, but is found in aOptionsDefaults, it sets the key in aOptions to the default value
	for (var aOptKey in aOptionsDefaults) {
		if (!(aOptKey in aOptions)) {
			aOptions[aOptKey] = aOptionsDefaults[aOptKey];
		}
	}
}

README

Rev1

• I use it like this:

  function(aOptions = {}) {
      var aOptionsDefaults = {
          rawr: true
      };
      validateOptionsObj(aOptions, aOptionsDefaults);
  }