renderLogic() {
    let items = [0,1,2,3,4,5,6,7,8,9,10,11,12,13,14];
    return items.map((item) => {
        if(items > 5) {
            return (
                <div key = {item} style={{float: 'left'}}>
                    {item}
                </div>
            );
        } else {
            return (
                <div key = {item}>
                    {item}
                </div>
            );
        }
    });
 }

render() {
  return  (
    <div className="sample-container">
      {this.renderLogic()}
    </div>
  );
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14

1  6  11
2  7  12
3  8  13
4  9  14
5  10