lodash

问题 I am reading some code that uses _.flow() from lodash and the explanation in the docs just isn't making sense to me. The doc says Creates a function that returns the result of invoking the given functions with the this binding of the created function, where each successive invocation is supplied the return value of the previous. With the example: function square(n) { return n * n; } var addSquare = _.flow([_.add, square]); addSquare(1, 2); // => 9 I have read this a few times and I can not

问题 I have an array of objects annd i want to sort by deeper field. How can i do this? var array = { "id": 27, "name": "La Primita Product", "lottery": { "id": 1, "name": "La Primitiva", "jackpotAmount": 10000, } }, { "id": 28, "name": "La Primita Product", "lottery": { "id": 1, "name": "La Primitiva", "jackpotAmount": 10000, } How can i sort by lottery.jackpotAmount? 回答1: To _.sortBy you can pass callback as a second argument, like this var array = [{ "id": 27, "name": "La Primita Product",

问题 This is an attempt in a tic tac toe game app. I have two arrays playerMoves and winningCombinations . Like this. var playerMoves= [0,1,4]; var winningCombinations = [ [0,1,2],[3,4,5],[6,7,8], [0,3,6],[1,4,7],[2,5,8], [0,4,8],[2,4,6] ]; I need to filter the winningCombination array such that at-least and at-most two values of playerMoves array matches with each array in winningCombination . findPossibleMove(playerMoves); // should return [[0,1,2],[1,4,7], [0,4,8] ] My attempt function

问题 I have grouped using the lodash module as below: export class DtoTransactionCategory { categoryName: String; totalPrice: number; } groupBy import { groupBy} from 'lodash'; let result = groupBy(transactionCategoryList, (c: DtoTransactionCategory) => { return c.categoryName }); Result: So now I need to get the above array like this (i.e. totalPrice is the sum of the group ): let myNewArry = [{categoryName:"cat1",totalPrice: 9400}, {categoryName:"cat2",totalPrice: 600}] Can you tell me how to

问题 I have an array with objects like so: [ { phase: 1, fields: [ { id: 1, type: 'string' }, { id: 2, type: 'date' } ] }, { phase: 2, fields: [ { id: 3, type: 'date' }, { id: 4, type: 'date' } ] }, { phase: 3, fields: [ { id: 5, type: 'string' }, { id: 6, type: 'date' } ] }, { phase: 4, fields: [ { id: 7, type: 'date' }, { id: 8, type: 'string' } ] }, ] I want to search through this array and return an array with only the fields that have type date . I have been looking at the lodash functions

问题 There are two arrays: [ {"id": "5c5030b9a1ccb11fe8c321f4", "quantity": 1}, {"id": "344430b94t4t34rwefewfdff", "quantity": 5}, {"id": "342343343t4t34rwefewfd53", "quantity": 3} ] and [ {"id": "5c5030b9a1ccb11fe8c321f4", "quantity": 2}, {"id": "344430b94t4t34rwefewfdff", "quantity": 1} ] How to combine them into one summing quantity? [ {"id": "5c5030b9a1ccb11fe8c321f4", "quantity": 3}, {"id": "344430b94t4t34rwefewfdff", "quantity": 6}, {"id": "342343343t4t34rwefewfd53", "quantity": 3} ] One of

问题 var json = [{ "city": "California", "name": "Joe", "age": 17 }, { "city": "California", "name": "Bob", "age": 17 }, { "city": "California", "name": "Bob", "age": 35 }, { "city": "Texas", "name": "Bob", "age": 35 }, { "city": "Florida", "name": "Bob", "age": 35 } ]; I just to no of occurence based on city value i.e output as below. updatedjson=[{"name":"California","count":3},{"name":"Texas","count":1},{"name":"Florida","count":1}] using any approah using lodash or javascript 回答1: Using Lodash

问题 From the below Json, I am trying to build an array as shown below. "Issues": [ { "Id": null, "Key": null, "Values": [ { "Key": "Display Name", "Value": "Rya" }, { "Key": "UserName", "Value": "RH" }, { "Key": "Count", "Value": "350" } ] }, { "Id": null, "Key": null, "Values": [ { "Key": "Display Name", "Value": "Mike" }, { "Key": "UserName", "Value": "ML" }, { "Key": "Count", "Value": "90" } ] } ] Desired Array: { "Display Name": 'Rya', "UserName" : "RH", value: 350 }, { "Display Name": 'Mike'

问题 I'm new to JS and React and I'm a little stuck here. I've searched through SO but I'm having trouble finding a solution with an explanation that works. Here are my arrays. The first array is pretty simple. [1, 3, 4,] The second looks like this. [ { id: 1, title: Title 1, }, { id: 2, title: Title 2, }, ] What I'd like to do is search the second array and if I can find an id that matches a value in the first array, add the object from the second array to third, new array. I've tried a number of

问题 I'm new to JS and React and I'm a little stuck here. I've searched through SO but I'm having trouble finding a solution with an explanation that works. Here are my arrays. The first array is pretty simple. [1, 3, 4,] The second looks like this. [ { id: 1, title: Title 1, }, { id: 2, title: Title 2, }, ] What I'd like to do is search the second array and if I can find an id that matches a value in the first array, add the object from the second array to third, new array. I've tried a number of