var arr = ['text', 'text', false && 'text', true && 'text', 'text', undefined, null, 'last str']; var repeats = 10000; var cnF = (...args) => { return args.filter(cls => ( cls !== undefined && cls !== null && cls !== false )).join(' ') }; var cnW = (...args) => { var i = 0 var str = '' while (i < args.length) { var cls = args[i] if (cls !== undefined && cls !== null && cls !== false) { if (str.length > 0) str += ' ' str += cls } i++ } return str };