using lodash _.groupBy to group an array of float numbers:
1.8942
1.6841
1.5585
1.6123
1.4681
1.927
1.6733
2.7598
3.0039
3.0656
3.8402
3.3569
3.4411
4.5505
4.2808
4.3106
5.3474
5.7764
5.705
5.2363
5.0831
5.4154
5.3852
5.0308
5.1012
5.8101
5.4574
6.257
6.2296
6.3967
7.2575
7.3822
7.345
7.8111
7.0722
7.5819
7.2987
7.8582
7.0706
8.8354
8.0049
8.3631
8.2244
8.8568
8.1373
8.5352
8.0606
9.1166
9.4562
9.5369