public List<String> preview(int limit, boolean noHeaderLine) {
        E.illegalArgumentIf(limit < 1, "limit must be positive integer");
        return fetch(noHeaderLine ? 1 : 0, limit);
    }
public List < String > preview ( int limit , boolean noHeaderLine ) { E . illegalArgumentIf ( limit < 1 , "limit must be positive integer" ) ; return fetch ( noHeaderLine ? 1 : 0 , limit ) ; }
Returns first `limit` lines.

@param limit
the number of lines to be returned
@param noHeaderLine
if `false` then header line will be excluded in the return list
@return the first `limit` lines.