In this lesson, we’ll use a Maybe to safely operate on properties of an object that could be undefined. We’ll use our initial code as the basis for a
prop utility function that can be reused with different objects and various property names. Instead of just blindly asking for a property, this version of
prop will drop us into the safe confines of a Maybe, giving us a
Just when the property exists and a
Nothing for an
undefined property. Once we’ve built up our own
prop utility, we’ll refactor the code one more time to take advantage of the built-in
prop utility provided by the crocks library.
Is there any difference between ramda's
compose and crocks'
compose that we saw in the previous lesson, or can they be used interchangeably? Is there a reason to prefer one over the other?
Many thanks, this is all very interesting and well explained!
Nope, they both accomplish the same goal and you should be fine using either one. I would try to be consistent with which library I use for a particular function throughout a project, but either choice should be fine if you're already pulling in both libraries.
Glad you're enjoying it so far!
Very good job Andy. How would you handle the case when the value of the key you are interested in is not an integer but a string?
which font is he using? Somebody know it?