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Update code documentation

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This commit is contained in:
Maciej Ziarkowski 2019-10-24 15:57:09 +01:00
parent 8bc56fbbe2
commit 0f88627ab2
1 changed files with 10 additions and 3 deletions
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13
app/src/frontend/helpers.ts
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@ -36,6 +36,13 @@ function sanitiseURL(string){
return `${url_.protocol}//${url_.hostname}${url_.pathname || ''}${url_.search || ''}${url_.hash || ''}`
}
/**
* Transform an array of objects into a dictionary of arrays of objects,
* where the objects are grouped into arrays given an arbitrary key function
* that gives a key for each object.
* @param arr array of objects to group
* @param keyAccessor function returning the grouping key for each object in the original array
*/
function arrayToDictionary<T>(arr: T[], keyAccessor: (obj: T) => string): {[key: string]: T[]} {
return arr.reduce((obj, item) => {
(obj[keyAccessor(item)] = obj[keyAccessor(item)] || []).push(item);
@ -44,9 +51,9 @@ function arrayToDictionary<T>(arr: T[], keyAccessor: (obj: T) => string): {[key:
}
/**
* Parse a string containing
* @param isoUtcDate a date string in ISO8601 format
*
* Parse a string containing an ISO8601 formatted date
* @param isoUtcDate a date string in ISO8601 format, assuming UTC
* @returns a JS Date object with the UTC time encoded
*/
function parseDate(isoUtcDate: string): Date {
const [year, month, day, hour, minute, second, millisecond] = isoUtcDate.match(/^(\d{4})-(\d\d)-(\d\d)T(\d\d):(\d\d):(\d\d).(\d{3})Z$/)