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import { propertyKeyRegex } from './property-key-regex.js'
import { FlattenParams, GetOptions } from './flat.types.js'
/**
* @load ./select-params.doc.md
* @memberof module:flat
* @param {FlattenParams} params
* @param {string | Array<string>} properties
* @param {GetOptions} [options]
* @returns {FlattenParams}
*/
const selectParams = (
params: FlattenParams,
properties: string | Array<string>,
options?: GetOptions,
): FlattenParams => {
const propertyArray = Array.isArray(properties) ? properties : [properties]
const selected = propertyArray
.filter((propertyPath) => !!propertyPath)
.reduce((globalMemo, propertyPath) => {
const regex = propertyKeyRegex(propertyPath, options)
const filtered = Object.keys(params)
// filter all keys which starts with property path
.filter((key) => key.match(regex))
.reduce((memo, key) => {
memo[key] = (params[key] as string)
return memo
}, {} as FlattenParams)
return {
...globalMemo,
...filtered,
}
}, {} as FlattenParams)
return selected
}
export { selectParams }
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