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Diffstat (limited to 'src/data/composite/data/withIndexInList.js')
-rw-r--r-- | src/data/composite/data/withIndexInList.js | 38 |
1 files changed, 38 insertions, 0 deletions
diff --git a/src/data/composite/data/withIndexInList.js b/src/data/composite/data/withIndexInList.js new file mode 100644 index 00000000..b1af2033 --- /dev/null +++ b/src/data/composite/data/withIndexInList.js @@ -0,0 +1,38 @@ +// Gets the index of the provided item in the provided list. Note that this +// will output -1 if the item is not found, and this may be detected using +// any availability check with type: 'index'. If the list includes the item +// twice, the output index will be of the first match. +// +// Both the list and item must be provided. +// +// See also: +// - withNearbyItemFromList +// - exitWithoutDependency +// - raiseOutputWithoutDependency +// + +import {input, templateCompositeFrom} from '#composite'; + +export default templateCompositeFrom({ + annotation: `withIndexInList`, + + inputs: { + list: input({acceptsNull: false, type: 'array'}), + item: input({acceptsNull: false}), + }, + + outputs: ['#index'], + + steps: () => [ + { + dependencies: [input('list'), input('item')], + compute: (continuation, { + [input('list')]: list, + [input('item')]: item, + }) => continuation({ + ['#index']: + list.indexOf(item), + }), + }, + ], +}); |