ramda.js

问题 Continuing from RamdaJS groupBy and tranform object let children = [ { "name": "Bob", "age": 8, "father": "Mike" }, { "name": "David", "age": 10, "father": "Mike" }, { "name": "Amy", "age": 2, "father": "Mike" }, { "name": "Jeff", "age": 11, "father": "Jack" } ] let schoolList = [ { "name": "Bob", "class": "8-A", "school": "School 1" }, { "name": "David", "class": "10-B", "school": "School 1" }, { "name": "Amy", "class": "2-A", "school": "School 1" }, { "name": "Jeff", "class": "11-C",

问题 I want to transform this array of objects using RamdaJS. From this array of objects let children = [ { "name": "Bob", "age": 8, "father": "Mike" }, { "name": "David", "age": 10, "father": "Mike" }, { "name": "Amy", "age": 2, "father": "Mike" }, { "name": "Jeff", "age": 11, "father": "Jack" } ] into this array of objects let fatherAndKids = [ { "father": "Mike", "count" : 3, "kids": [ { "name": "Bob", "age": 8 }, { "name": "David", "age": 10 }, { "name": "Amy", "age": 2 } ] }, { "father":

问题 I'm a beginner in functional programming and I want to transform this jquery function with the functional programming paradigm. I try to transform this function merge: function( first, second ) { var len = +second.length, j = 0, i = first.length; for ( ; j < len; j++ ) { first[ i++ ] = second[ j ]; } first.length = i; return first; } It is just a simple merge function. For example, when I call merge([0,1,2,3,4],[5,6,7,8,9]); It produces [0,1,2,3,4,5,6,7,8,9] What I did is merge: function(

问题 Given that functional programming is best when sticking to immutable variables as much as possible, and that Ramda always makes shallow copies, how are objects that must be mutable dealt with in a mostly-purely functional framework? For example, consider PIXI.Sprite (in pixi.js). The display system has an inherent hierarchy that is linked together and has its own way of tracking objects so it can re-use textures, etc. Garbage collecting them could be a real problem. What sort of approaches

问题 In previous question I tried to group arrays by parent ids and then remove them from each object - Group arrays by parent ids object Ramda. But now I have a new issue. For example I want to update title in object with id 12. My data model: const stuff = { "31": [ { "id": "11", "title": "ramda heeeelp" }, { "id": "12", "title": "ramda 123" } ], "33": [ { "id": "3", "title": "..." } ], "4321": [ { "id": "1", "title": "hello world" } ] } Attempts: const alter = (id, key, value) => pipe( values,

问题 For example I have something like: const stuff = { "31": [ { "id": "11", "title": "ramda heeeelp" }, { "id": "12", "title": "ramda 123" } ], "33": [ { "id": "3", "title": "..." } ], "4321": [ { "id": "1", "title": "hello world" } ] } I need to find object with id 11. How I did: map(key => find(propEq('id', 11))(stuff[key]), keys(stuff)) However it returns [{..object with id 11..}, undefined, undefined] due to map. Ok, we could check if object isn't undefined, but it isn't clear as I want. 回答1

问题 I would need to rewrite all properties for an object which could contains hyphenated word to camelCase using ramdajs . Example, property name animation-timing-function should become animationTimingFunction and so on for every keys. Could you please provide an example: Here is data I should convert: var data = { "bounce": [ { "animation-timing-function": "cubic-bezier(0.215, 0.610, 0.355, 1.000)", "transform": "translate3d(0,0,0)", "offset": 0 }, { "animation-timing-function": "cubic-bezier(0

问题 The following script create an object filtering some input data. It is coded in a declarative way using several nested forEach . I would like to know which API to use in rewritting this code using ramdajs or lodash, specially I would be interested in understand if use of pipe is appropriate in this case otherwise another way. An example of code would be appreciate (specially for ramdajs). Thanks. var data = { "type": "stylesheet", "stylesheet": { "rules": [{ "type": "keyframes", "name":

问题 I have an array of unique values: const array = [1, 2, 4] I have a collection of unique objects: const collection = [ { type: 1, eyes: 'blue'}, { type: 2, eyes: 'brown'}, { type: 3, eyes: 'green'}, { type: 4, eyes: 'blue'} ] Using Ramda how do I extract all the objects from collection where type is included in array ? Expected outcome: [ { type: 1, eyes: 'blue'}, { type: 2, eyes: 'brown'}, { type: 4, eyes: 'blue'} ] 回答1: Use R.innerJoin(): const array = [1, 2, 4] const collection = [{ type: 1

问题 var arr = [functionA(), functionB(), functionC()] var data = { /** some data */ } How can I dynamically add the functions from the arr list and add it to ramda pipe. Expected code: const newFn = pipe(functionA, functionB, functionC) newFn(data) 回答1: You can use apply: const buildPipe = apply(pipe); const add3 = buildPipe([inc, inc, inc]); const add4 = buildPipe([inc, inc, inc, inc]); console.log(add3(1)); console.log(add4(2)); <script src="https://cdnjs.cloudflare.com/ajax/libs/ramda/0.26.1