Recently I was writing some Clojure with a coworker and we needed to insert values into a nested map structure. Our first solution (and example of using it at the repl) looked something like this.
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This worked but seemed overly verbose for doing what (in our minds) should have been a simple operation. After some digging around in the docs we found the function
assoc-in. This useful function allowed us to greatly simplify the code.
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Much simpler and easier to read. The next person to look at the code will be able to quickly skim and tell what the code is doing.
assoc-in can also be used with nested associative structures like vectors.
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Hopefully this post makes searching for how to insert into nested maps slighly easier for the next person who thinks there must be a better way for doing this.