Source 
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| File | Identifier | Document |
| src/by.js | by | 100 %1/1 |
| src/group.js | group | 100 %1/1 |
| src/groupby.js | groupby | 100 %1/1 |
| src/index.js | - | - |
3/3| File | Identifier | Document |
| src/by.js | by | 100 %1/1 |
| src/group.js | group | 100 %1/1 |
| src/groupby.js | groupby | 100 %1/1 |
| src/index.js | - | - |