A modern programming language that makes developers happier.

kotlinlang

`Day29`
• 80% thru Lesson8
    ◦ 1) Create Retrofit object (_addConverterFactory(), baseUrl()_) --&gt; 2) Define a service API _interface_ (_GET_ annotation to specify an endpoint) --&gt; 3) Create Retrofit Service (retrofit._create_(interface))
        ▪︎ Retrofit _Call_ object - starts network request
        ▪︎ _.enqueue()_ method - starts the request on _background thread_, calls _Callbacks_ when the request is complete
        ▪︎ should add internet permissions in _manifest,_ by adding _&lt;uses-permissions tag_ (Android libraries can have its own manifest file. Can check the permission it asks)
        ▪︎ Moshi library - parses JSON response to kotlin objects
            • Needs a data class to store the JSON values (Data class property names should match the names inside JSON response, or attach JSON annotation
        ▪︎ Deferred object - await() - suspend function which causes the code to await without blocking
    ◦ Displaying a photo from URL, using Glide library
        ▪︎ Steps needed - download, buffer, decode from compressed to android compatible format, cache ... (--&gt; all should happen in background thread)
        ▪︎ Set up placeholder image, error image
• Etc.
    ◦ (recap) coroutine _job_ - provides methods for cancelling &amp; determining the state of a coroutine etc
    ◦ (recap) _Dispatcher_ sends off coroutines to run on various threads (Dispatcher.main, <http://Dispatcher.io|Dispatcher.io>) / Main dispatcher uses UI thread.
    ◦ (recap)  ? is nullable
    ◦ (recap) kotlin scope function - let (<https://stackoverflow.com/questions/58606651/what-is-the-purpose-of-let-keyword-in-kotlin|link>) (let{} returns whatever the lambda block evaluates to / apply{} will return the context object)
`Self-Comment`
• Quite a lot of contents than I expected. My ego urges myself to finish lesson8 but I have morning doctor appointment so I'll just have to wrap it up here. 
• Hoping to finish this course by wednesday!
`Goals Tomorrow`
• Finish Lesson8 - parcel stuff / Finish lesson9