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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.
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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.
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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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Display Modes. Quote: Originally Posted by john61ct love the use of "bandwidth" for current rate, good analogy Well for others then, Quote: Originally Posted by tanglewood Glad you got it. I have no idea what that means. Quote: Originally Posted by john61ct Well let's not overstate. Quote: Originally Posted by john61ct For example, starting with those cells: RuiXu rings a bell, was Newhaul test-ordering to see if those are genuine Sinopoly? Show Printable Version.
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