lodash

问题 An array is as follows : const arr = [ { name: 'Aditya', hobbies: ['Football', 'Basketball'] }, { name: 'Amitabh', hobbies: [] }, { name: 'Akhsara', hobbies: ['Basketball'] }, { name: 'Aia', hobbies: [] } ]; Using filter function as follows: public getDatas(hobby) { const data = _.filter(arr, {hobbies : hobby === 'Unclear' : [] ? [hobby]} ); } I have some how set the Unclear hobbies to empty arrays, when it is Unclear then it is NOT returning me the data with hobbies : [] instead it is

问题 I can't figure out how I can count the total devices based on location and unique serial number. { "dates": [ { "date": "Sep 1, 2014", "devices": [ { "model": "Canon", "location": "Chicago", "serialNum": "abc123" }, { "model": "Canon", "location": "Chicago", "serialNum": "xyz456" }, { "model": "HP", "location": "New York", "serialNum": "123456" }, { "model": "Brother", "location": "Chicago", "serialNum": "DEF777" } ] }, { "date": "Sep 2, 2014", "devices": [ { "model": "Canon", "location":

问题 This question already has answers here : JavaScript merging objects by id (11 answers) Closed 8 months ago . I have an array: [ { assignmentId:17, email:"john.smith@email.com" expectation: "Make sure to proofread!", firstName:"John" id:23 ignoreForFeedback: true lastName:"Smith" level:2 levelFraction:null score:35 }, { assignmentId:17 countsPerCategory: Array(4) email:"john.smith@email.com" firstName:"John" frequentErrors: Array(5) id:23 ignoreForGrading: true lastName:"Smith" }, {

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 Background I have a JavaScript function that prints numbers to the screen. This function prints a lot of numbers, but I am using a screen as old as Alan Turing so it can't print the numbers so fast! The solution? Throtlle/debounce/delay the prints using underscorejs or lodash. Tentative My first tentative was to use throttle . let fun = num => { console.log(num); }; let throttleFun = _.throttle(fun, 1000); for (let i = 0; i < 10; i++) { throttleFun(i); } <script src="https://cdnjs.cloudflare

问题 I have a Json data that I need to sort before display it. My Json is as below. I need to sort them based on the ColumnLocation. [{ "Name": "PieChart", "Id": "1", "ColumnLocation": "0", "RowLocation": "0" }, { "Name": "Calendar", "Id": "2", "ColumnLocation": "1", "RowLocation": "0" }, { "Name": "FavouriteFilter", "Id": "3", "ColumnLocation": "2", "RowLocation": "0" }, { "Name": "FilterResults", "Id": "4", "ColumnLocation": "0", "RowLocation": "1" }, { "Name": "Watched", "Id": "5",

问题 I have a Json data that I need adjust before sending it to my component. My Json is as below. I need to identify the missing fields and move the below ones up. [{ "Id": "a", "ColumnLocation": "0", "RowLocation": "0" }, { "Id": "b", "ColumnLocation": "0", "RowLocation": "1" }, { "Id": "4", "ColumnLocation": "0", "RowLocation": "3" }, { "Id": "c", "ColumnLocation": "1", "RowLocation": "0" }, { "Id": "d", "ColumnLocation": "1", "RowLocation": "2" }, { "Id": "e", "ColumnLocation": "2",

问题 I have an array with json data in the below format staff = [ { "id" : 1, "name" : "Robert" }, { "id" : 2, "name" : "Peter" } ] I am trying to get the designation of these people. There is an API which accepts group of ids. I am trying to get designations in batches of 30. i.e send first 30 objects and get their designations and go on.. I tried keeping a for loop and pass 30 objects but unsuccessful. Designation API gives data in the below format. [ { "staffId": "26", "designation": "PRA" }, {

问题 I have a search field that takes user input and makes ajax requests using a debounced event listener. html: <input id="search" type="text"></input> javascript: function makeRequest() { // make ajax request, do things with the information } $('#search').on('keypress', _.debounce(makeRequest, 200)); I need the event listener to not use the debounced ajax function on arrow up and down, that is event.keyCode === 38 or event.keyCode === 40 Is there a way to apply the advice from this question to

问题 I have an array of objects array = [ {id: 5, name: "Helen", age: 20}, {id: 15, name: "Lucy", age: 30}, {id:7, name: "Carlos", age: 1} ] Then I have a similar array sorted differently arraySorted = [ {id: 15, name: "Lucy", age: 2}, {id: 5, name: "Lara", age: 11}, {id:7, name: "Carlos", age: 10} ] The ids of the objects on both arrays will always match, the rest of the properties may or may not. What I need is sorting the array in the same id order as arraySorted . (it can be also done on plain