ramda.js


Can't wrap my head around “lift” in Ramda.js

社会主义新天地 提交于 2020-01-19 07:05:07
问题 Looking at the source for Ramda.js, specifically at the "lift" function. lift liftN Here's the given example: var madd3 = R.lift(R.curry((a, b, c) => a + b + c)); madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7] So the first number of the result is easy, a , b , and c , are all the first elements of each array. The second one isn't as easy for me to understand. Are the arguments the second value of each array (2, 2, undefined) or is it the second value of the first array and the

Can't wrap my head around “lift” in Ramda.js

♀尐吖头ヾ 提交于 2020-01-19 07:03:06
问题 Looking at the source for Ramda.js, specifically at the "lift" function. lift liftN Here's the given example: var madd3 = R.lift(R.curry((a, b, c) => a + b + c)); madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7] So the first number of the result is easy, a , b , and c , are all the first elements of each array. The second one isn't as easy for me to understand. Are the arguments the second value of each array (2, 2, undefined) or is it the second value of the first array and the

Ramda to loop over array

人盡茶涼 提交于 2020-01-11 13:10:51
问题 Loop may be the wrong term, but it kind of describes what I am attempting. I want to give structure to flat data, but I also need to keep track of the array it came from. Basically my rules are (per array): If level 1 exists- give it the name of the item, and a typechild array. EACH time a level 1 appears (even in the same array) it should create a new entry. Inside typechild , put the any items with level >1 If NO level 1 exists- give it the name of the item, and a typechild array. My code

Apply a list of functions to a value in Ramda

不想你离开。 提交于 2020-01-10 18:42:06
问题 How would I best create this function in Ramda? function get_list (value) { return [ first_transform(value), second_transform(value) ] } get_list(12) I guess this is the inverse of the map function. 回答1: You've got a few options for this. Assuming your functions are already in a list: transforms = [first_transform, second_transform]; The first option is to use R.juxt, which does pretty much exactly what you're after by creating a new function that applies the list of given functions to the

How to dynamically fill/expand a 2d Array using a callback function in Ramda.js

自闭症网瘾萝莉.ら 提交于 2020-01-06 05:45:05
问题 I want to create a dynamic function that can simplify work with array-transforming callbacks in order to fill and expand 2d Array. Outlining the challenge I would like to create a function like this finalFunction({ array, header, ...args }, callbackFunctionToTransformArray) Restrictions The given array is always a 2d array The header is supplied as a string to be passed onto the callbackFunction The callback function always has to return a "changes" Object containing the headers as Keys. The

Group arrays by parent ids object Ramda

爱⌒轻易说出口 提交于 2020-01-06 02:20:15
问题 Need a help from Ramda community... I have an object array that I need to sort by "chapter_id" and after sorting, just remove "chapter_id": const stuff = [ { id: 1, title: "hello world", chapter_id: "4321" }, { id: 2, title: "new title", chapter_id: "21" }, { id: 3, title: "...", chapter_id: "33" }, { id: 4, title: "huh!?", chapter_id: "14" }, { id: 5, title: "From Earth", chapter_id: "11" }, { id: 6, title: "alien", chapter_id: "11" }, { id: 7, title: "Saturn", chapter_id: "11" }, { id: 8,

Unexpected 'sortBy' Behavior with Ramda

倾然丶 夕夏残阳落幕 提交于 2020-01-03 05:13:09
问题 Application of 'sortBy' producing unexpected results. I've gotta be doing something stoopid. This is such a basic operation. const input = [4,3,2,1]; const sort = list => R.sortBy(R.ascend(R.identity))(list); console.log(sort(input)); // [ 4, 3, 2, 1 ] I would expect the output of the 'console.log' invocation to be [ 1, 2, 3, 4 ], but it is not: the output is [ 4, 3, 2, 1 ], same as the input. What am I doing wrong? 回答1: As pointed out by Aadit M Shah in the comments you're not using sortBy

Get all values of a key in a nested array of objects using ramda.js

妖精的绣舞 提交于 2020-01-02 22:03:14
问题 I am a little confused in how to proceed with this scenario using ramda. Here is the JSON that I am working with. { "type" : "CartWsDTO", "Cartentries" : [ { "entryNumber" : 1, "flightGroup" : { "PAXDetails" : [ { "paxID" : "1", "paxPrice" : "770.82", "paxType" : "ADT" }, { "paxID" : "2", "paxPrice" : "770.82", "paxType" : "ADT" } ] } }, { "entryNumber" : 2, "flightGroup" : { "PAXDetails" : [ { "paxID" : "1", "paxName" : "Vinitha", "paxPrice" : "770.82", "paxSurname" : "Vinitha", "paxType" :

Functional way of re-using variables in a pipe

自闭症网瘾萝莉.ら 提交于 2020-01-01 15:38:47
问题 Using functional programming in javascript and typescript together with Ramda, I often find myself writing code like: const myFun = c => { const myId = c.id const value = pipe( getAnotherOtherPropOfC, transformToArray, mapToSomething, filterSomething, // ... N other transformations // ok now I need myId and also the result of the previous function chainMyIdWithResultOfPreviousFunction(myId) )(c) return value } Notice how creating a const myId breaks point-free style. I'd like to write myFun

Find path to object in object nested array

冷暖自知 提交于 2019-12-31 03:59:05
问题 I have an object, of which parameters contain and array of object. I receive 1 object id and I need to find its position in that whole mess. With procedural programming I got it working with: const opportunitiesById = { 1: [ { id: 1, name: 'offer 1' }, { id: 2, name: 'offer 1' } ], 2: [ { id: 3, name: 'offer 1' }, { id: 4, name: 'offer 1' } ], 3: [ { id: 5, name: 'offer 1' }, { id: 6, name: 'offer 1' } ] }; const findObjectIdByOfferId = (offerId) => { let opportunityId; let offerPosition;

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