Here is how my data object looks like and I tried to implement it like I am not sure if it is a good solution or we can write it in compact way. It also shows the correct number but if I try to use it in TypeScript I am a TS error ts(2769) Answer You can use R.chain with
Tag: ramda.js
Chunk array based on conditional logic using ramda
I have an array of sizes that I’d like to reduce + chunk based on custom logic using ramda: If the cumulative total exceeds the 50 threshold I would like to chunk them up, so that the result becomes: I’ve tried using reduceWhile and splitWhen but with no luck so far Answer Reduce the array to a new array. On…
How do I sum a key and group by value using Ramda?
I have data like this: How can I sum amount and group by each category yielding: Answer You could use reduceBy:
How can I make Underscore behave like Ramda?
Two days ago, I announced a preview release of Underscore that integrates with the new Node.js way of natively supporting ES modules.1 Yesterday, somebody responded on Twitter with the following question: Can you do Ramda-style data last functions? He or she was referring to one of the main differences betwee…
Ramda Curry with Implicit Null
I’ve been trying to learn the Ramda library and get my head around functional programming. This is mostly academic, but I was trying to create a nice logging function that I could use to log values to the console from within pipe or compose The thing I noticed Once you’ve curried a function with R…
How can I combine multiple reducers in Ramda?
I’m trying to build reports by combining several different functions. I’ve been able to get what I want using some vanilla javascript but it’s way too wonky and I know I’d be better off if I can use a library. Ramda seems right but I’ve hit a road block and I would appreciate it …
ramda transducers with final R.sum
I’m trying to understand Ramda’s transducers. Here’s a slightly modified example from the docs: But what if I want to sum the elements of the resulting array? The following (just adding R.sum into R.compose) doesn’t work: Answer I’d do something like this, just accumulate on top …
Ramda: How to remove keys in objects with empty values?
I have this object: I need to remove all key/value pairs in this object where the value is blank i.e. ” So the caste: ” property should be removed in the above case. I have tried: But this doesn’t do anything. reject doesn’t work either. What am I doing wrong? Answer You can use R.reje…
Rename keys with ramda js
expected output: I’m thinking the renamed keys are defined in an object (but fine if there’s a better way to map them): How can I do this with Ramda? Something with R.map Answer There is an entry in Ramda’s Cookbook for this: But with the ubiquity of ES6, it’s pretty easy to write this…
Ramda js: lens for deeply nested objects with nested arrays of objects
Using Ramda.js (and lenses), I want to modify the JavaScript object below to change “NAME:VERSION1” to “NAME:VERSION2” for the object that has ID= “/1/B/i”. I want to use a lens because I want to just change one deeply nested value, but otherwise retain the entire structure…