List a = ['111111111111111111111111111','22222222222','333333']
let aTitle = a.join('\n');
<div title={aTitle }>
{ a.map(item => (
<div className="a-value">{item}</div>
))}
</div>
css
.a-value{
overflow: hidden;
text-overflow: ellipsis;
white-space: nowrap;
}