src/dual-listbox.js
/**
     * @Private
     * Set the option variables to this.
     */
@Private
Set the option variables to this.
@Private Set the option variables to this .
_initOptions(options) {
        for (let key in options) {
            if (options.hasOwnProperty(key)) {
                this[key] = options[key];
            }
        }
    }
_initOptions ( options ) { for ( let key in options ) { if ( options . hasOwnProperty ( key ) ) { this [ key ] = options [ key ] ; } } }
@Private
 Set the option variables to this.
@Private Set the option variables to this .