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api:transforms [2017/10/20 01:10] payonel [Transforms API] |
api:transforms [2017/10/20 01:11] (current) payonel [Transforms API] |
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| * `predicate(element: value, index: number, tbl: table): number, number` | * `predicate(element: value, index: number, tbl: table): number, number` | ||
| - | This predicate is called in sequence on each index in `tbl`. `element` is the value at `tbl[index]`. Generally, predicate methods ignore `index` and `tbl`, and only process `element`. But some predicates may need to check values in `tbl` before or after `index`. *Important* to note that the `tbl` passed to the `predicate` is actually a _*view*_ of the original table passed to the transforms api. This _*view*_ is not a natural sequence but instead only returns values from `tbl` within the [`first`, `last`] range. | + | This predicate is called in sequence on each index in `tbl`. `element` is the value at `tbl[index]`. Generally, predicate methods ignore `index` and `tbl`, and only process `element`. But some predicates may need to check values in `tbl` before or after `index`. **Important** to note that the `tbl` passed to the `predicate` is actually a _**view**_ of the original table passed to the transforms api. This _**view**_ is not a natural sequence but instead only returns values from `tbl` within the [`first`, `last`] range. |
| In other words, the predicate handles a "set of elements" and returns parameters indicating the satisfied condition. | In other words, the predicate handles a "set of elements" and returns parameters indicating the satisfied condition. | ||