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checking the validity of collectionVolume in an imperative way
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| // @flow | |
| const MAX_VOLUME = 100 | |
| type CollectionState = { | |
| volume: number, | |
| } | |
| function getCollectionVolume(data: CollectionState): number { | |
| if (data && data.volume) { | |
| return data.volume | |
| } | |
| return 0 | |
| } | |
| const collectionVolume = getCollectionVolume(data) | |
| // ATTENTION => perform this check any time you want to use the volume | |
| if (collectionVolume === 0) { | |
| // undefined | |
| } else if (collectionVolume > MAX_VOLUME) { | |
| // display error | |
| } | |
| // collectionValue is the volume | |
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