| coalesce | Return first non-missing element |
| dcast | Convert data between wide and long forms. |
| dt_add_count | Additional useful functions |
| dt_anti_join | Join two data.frames by common columns. |
| dt_arrange | 'dplyr'-like interface for data.table. |
| dt_count | Additional useful functions |
| dt_filter | 'dplyr'-like interface for data.table. |
| dt_full_join | Join two data.frames by common columns. |
| dt_inner_join | Join two data.frames by common columns. |
| dt_left_join | Join two data.frames by common columns. |
| dt_mutate | 'dplyr'-like interface for data.table. |
| dt_right_join | Join two data.frames by common columns. |
| dt_select | 'dplyr'-like interface for data.table. |
| dt_semi_join | Join two data.frames by common columns. |
| dt_summarise | 'dplyr'-like interface for data.table. |
| dt_summarise_all | 'dplyr'-like interface for data.table. |
| dt_summarize | 'dplyr'-like interface for data.table. |
| dt_summarize_all | 'dplyr'-like interface for data.table. |
| dt_top_n | Additional useful functions |
| guess | Convert data between wide and long forms. |
| let | Modify, aggregate, select or filter data.frame/data.table |
| let.default | Modify, aggregate, select or filter data.frame/data.table |
| let_if | Modify, aggregate, select or filter data.frame/data.table |
| maditr | maditr: Pipe-Style Interface for 'data.table' |
| melt | Convert data between wide and long forms. |
| query | One-to-one interface for data.table '[' method |
| query_if | One-to-one interface for data.table '[' method |
| sort_by | Modify, aggregate, select or filter data.frame/data.table |
| take | Modify, aggregate, select or filter data.frame/data.table |
| take_if | Modify, aggregate, select or filter data.frame/data.table |