TILs - Fueling Curiosity, One Insight at a Time

[...Array(100).keys()] will return a range from 0 to 100

long read on load balancing https://blog.envoyproxy.io/introduction-to-modern-network-load-balancing-and-proxying-a57f6ff80236

more info on proxy javascript objects here https://docs.microsoft.com/en-us/scripting/javascript/reference/proxy-object-javascript

in es6 you can now proxy your object's operation like get, set etc. All you need to do it create a proxy on a object like const proxyObj = new Proxy(initialObj, handler) the initial object is the object that you want to create proxy for and handler object is the place where you override object's method like get and set.

about ActiveSupport::Notifications there is a railscasts on it http://railscasts.com/episodes/249-notifications-in-rails-3

In javascript generally if you reduce an array it starts from 0th element and goes till the end but if you want to run the reduce from right to left of an array i.e. start from last element and go till the first element use arr.reduceRight

In order to know hierarchy of translations, print defaults here https://github.com/rails/rails/blob/v5.1.4/activemodel/lib/active_model/errors.rb#L405 and see the magic!

flash.now in rails, which allows you to have flash messages which does not persists across subsequent action unlike regular flash i.e it sets a flash message which is available only to the current action and not for next. http://api.rubyonrails.org/v5.1/classes/ActionDispatch/Flash/FlashHash.html#method-i-now

[RealWorld](https://github.com/gothinkster/realworld) is a project that curates a list of implementations of frontends and backends in different frameworks for the same application spec . This is a great way to understand how to build non-trivial features when getting started with a new framework.