Something, Maybe

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Our world is full of uncertainty. This uncertainty bleeds into our programs. Constantly checking the presence of every value is a lot of work so we tend to only check the riskiest places and then have to deal with runtime null exceptions in the rest of our code. Elm and many other languages use a different approach to dealing with uncertainty: Maybe.

Always Be My Maybe review – another middling Netflix romantic comedy

In Elm, all values are guaranteed to be present except for those wrapped in a Maybe. This is a critical distinction. You can now be confident in most of your code and the compiler will force you to make presence-checks in places where values are optional. Unfortunately, this can quickly devolve into a nightmare of nested case statements.

For example, say you have a list of users and you want to uppercase the name of the first friend of the first user.

Maybe It’s Just Me Lyrics

This is typically done by providing some default value. With the helper function Maybe. Often there is no sensible default value so you just want to re-wrap in Maybe after doing a calculation.

Isolating the first step of our big case statement getting the friends of the first user we might say:. Trackbacks are Off. Pingbacks are Off. Refbacks are Off. Forum Rules. Recent Discussions 52ft custom metal, ketch rigged Florida private chartering. Started removing the teak deck. Water Distiller.

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