Get the opening Dow Jones Industrial Average for a date, or the most recent opening if the market is closed for that day.
It fetches data from a web service, with the option to cache the results for future requests.
I use this for xkcd Geohashing.
npm install djia
// Cache the result in $HOME/.config/djia// Cache it in your current directory
YYYY-MM-DD formatted date string or
The first paramter is either a
YYYY-MM-DD date string or an object of options.
YYYY-MM-DD formatted date string)
If you are using the object form, then pass in the formatted date string using the
options.cache (optional, can be
true or path to cache directory/file in node or cache prefix in the browser)
Since the fetched data will never change (it is only for the opening value), it can make sense to cache it. There are slight differences in how this works if you are using it in the browser vs Node.
If you pass in
true then a cache directory will be created for you at
$HOME/.config/djia. You can also pass in a path to your own cache directory or a
.json file, and they will be created if they do not exist. If your path ends in
.json thats where the cache will be, otherwise it is assumed you are passing in a direcotry and the path will be
It will use
localforage to cache everything. If you pass in
true then each key will be prefixed with
djia_, otherwise pass in a string and it will use that. The key format is
err will be an
Error object with a message most likely from the web service.
value will be the Dow Jones opening value as a
This is written in ES6 and compiled to ES5 using
babel. The code you require will come from the
lib/ directory which gets compiled from
src/ before each