A way to pass in options to a function to override default options

Passing optional argument Object to a function construtor

function MyCoolThing(options) {
  
  // default options
  this.options = {
    feature: false,
    timeOut: 4000,
    title: 'Feature title'
  };
  
  // override default options
  if ( typeof options !== 'undefined' ) {
    for ( prop in options ) {
      if ( prop in this.options ) {
        this.options[prop] = options[prop];
      }
    }
  }

}

var sweet = new MyCoolThing({
  feature: true,
  timeOut: 2000
});