Iterate list and return the first derived value that is truthy
npm install find-derivedLike Array.prototype.find but returns the result of the first derived values (ie. function call on an item in the list) that is truthy.
``js
import {
findDerived
} from 'find-derived'
const derive = (item) => item > 2 ? item * 2 : false
// 6
return findDerived([1,2,3,4], derive)
`
`js
import {
addFindDerivedTo
} from 'find-first-value'
addFindDerivedTo(Array.prototype)
// 6
return [1,2,3,4].findDerived(derive)
`
A common usage is to use this to try different strategies. Each strategy can have a guard
`js
strategies = [
tryLocalCache,
tryDownloadRepo,
tryDownloadNpm,
]
function tryLocalCache(options) {
// guard clause
if (!isCached(options)) return false
// resolve from cache
// ...
return files
}
// retrieve files of first strategy that resolves
const files = strategies.findDerived((strategy)=> strategy(options))
``
MIT