/* Trim empty strings from JS string-Arrays */
function trimStringArray( array ){
    return array.join( ',' ).replace( /,{2,}/g, ',').split( ',' );
}

var helloWorld = [ 'Hello', '', 'world', '!' ];
console.log( helloWorld.join(' ') );
console.log( trimStringArray( helloWorld ).join(' ') )

var breadCrumb = [ 
    'The universe', '', 
    'The milky way', '', '', 
    'Sol', 'Earth', 
    '', 'Mostly harmless' ];

console.log( breadCrumb.join( ' -> ' )  );
console.log( trimStringArray( breadCrumb ).join( ' -> ' )  );