Sunrise | A QR code focused check-in and redemption webapp | QRCode Processing library

This is happening because you're returning a React Fragment for each item on your list. To use a key with Fragment, you need to do this way:

Here is the solution for my case (seems to be an issue with optional usage somehow) :

First assuming that you want to store the data as per you model, you will need Type converters for all of the columns in the WeatherModel class (aka the Places table) the that are not types of String, integer types (long, Long, int, Int etc), decimal types (float, double Float, Double etc), or byte arrays; to convert them into such types.

• i.e list and city.

Typically these converters would convert the type into a String as a JSON string (a byte array could potentially be used, it is unlikely (impossible?) to represent such objects as the integer or decimal values).

However, the resultant string, doesn't exactly assist in retrieving by a city name. That is the data in the city column would be something like :-

This is where you may start experiencing difficulties, say you wanted to search for *New York within the above data.

Then simply using a query that uses .... WHERE instr(city,'New York') > 0 , which in itself is beyond where some would be familiar with, could be used e.g. in room it could be :-

This section os wrong

You must add conditions, because your state empty by default and in child components you use properties of undefined. Also you can get error from api.

By using Object.keys(data):

temp is not array ! is Object so you cant get index

You have wrong id's, wrong tranlate3d values, and you forgot to add additional checked id's to account for your 3 additional slides. The snippet below should now work.

A particularly interesting question with a more complex answer than I think you may have anticipated.

First off, I fear you have also forgotten to consider that timezones alone do not provide enough information to calculate day or night. You must also cross-reference that with a latitude reference because the duration of day and night vary across that.

A helpful lead, from another answer on Stack Overflow with similar credentials: https://stackoverflow.com/a/15044683/60318

A concise description of an algorithm to calculate the sunrise and sunset is provided by the United States Naval Observatory, available here:

http://edwilliams.org/sunrise_sunset_algorithm.htm

In addition to providing the date and location, you also need to select a Zenith angle (at which the sun will be considered to have "risen" or "set") - the page linked has several options.

This would still need to be built into a function, but perhaps if you are clever with looking for gists on github you might find something helpful.

There is a sunrise/sunset calculator found here: https://gml.noaa.gov/grad/solcalc/sunrise.html

You can get an idea of cross-referencing the user's location with the timezones, and I think you will have a more complete solution.