lodash

问题 I am trying to implement a filtering functionality for showing list of buses based on some parameters using lodash.js . Here are four parameters for filtering boardingPoint,droppingPoint,busType and operatorName and it will be populated in 4 dropdown menu's. Workflow When user select a boardingPoint the result should contains only list of buses with selected boarding points , If he select boardingPoint and droppingPoint result should contains only the list of buses with selected boradingPoint

问题 This question already has answers here : Get array of object's keys (7 answers) Closed 4 years ago . I have the following object var columns = {ContributionType: "Employer Contribution", Employee1: "0", Employee2: "0", Employee3: "0" }; From this I need to form an array with they property keys alone like following var keys=["ContributionType", "Employee1", "Employee2", "Employee3"]; The number of properties is dynamic Question: How can I achieve this using lodash or pure JavaScript? 回答1:

问题 var keys = ['name','age','gender']; var input = {"document": {"people":[ {"name":["Harry Potter"],"age":["18"],"gender":["Male"]}, {"name":["hermione granger"],"age":["18"],"gender":["Female"]}, ]} } How to get values from specific key. Example {Harry Potter, 18, Male} ? 回答1: You could use pick to extract the properties that you're interested in: var people = _.map(input.document.people, function(person){ return _.flatten( _.values(_.pick(person, keys))); }); angular.module('MyModule', [])

问题 I have below object which I am currently looping through in number of different functions to get an item with name or setting a new value. Currently I am using lodash _.foreach and ._map to achieve both actions. I know lodash has function such as _.filter however I am unable to get it to work with the object that I have. let data = [ { "panels" : [ { "title": "Panel 1", "items" : [ { "name": item1, "value": 1 } { "name": item2, "value": 2 } ] }, { "title": "Panel 2", "items" : [ { "name":

问题 I'm using lodash in a react app to update and delete nested elements in an array that contains objects which subsequently update my component state and saves to localStorage. questions = [{"question":"","type":"text","conditions":null,"isSub":false,"subQ":[]}] path = '[0]' //returns [undefined x 1] function deleteQuestion(path){ const { questions } = this.state _.pullAt(questions, path) this.setState({questions: questions}) } I'm new to lodash but what's the best way to delete elements by a

问题 If you are trying to hide and show children based on an input's value with jQuery it will cause performance issue while typing. To avoid calling the filter function after every character, use the debounce method of lodash . html <input id="search" /> <div> <div class="child">foo</div> <div class="child">bar</div> .... </div> javasrcript var filterChildren = function() { var value = $(this).val().toLowerCase(); $(".child").filter(function() { $(this).toggle($(this).text().toLowerCase().indexOf

问题 Everyone, this is my Array Structure let data = [ {"name": "ragupathi", "siteID": 10}, {"name": "abi","siteID": 13}, {"name": "mahesh", "siteID": 12}, ] i want group data based on siteID so I am using groupBy siteID let sample = _.groupBy(data,'siteID'); the current output is : { "10": [ { "name": "ragupathi", "siteID": 10 } ], "12": [ { "name": "mahesh", "siteID": 12 } ], "13": [ { "name": "abi", "siteID": 13 } ] } But I am Expecting output name in ASC order { "13": [ { "name": "abi",

问题 I have the following code: $scope.option.cityMap = data.reduce(function (rv, v) { rv[v.cityId] = v; return rv; }, {}); Can someone tell me how I can implement this with the _.lodash forEach ? I have looked at the docs but I am not sure how to implement the callback function so it creates an array. $scope.option.cityMap = _.forEach(data, 回答1: Using the functional helpers all solutions are less efficient than "imperative style": var cityMap = {}; var len = data.length; for (var i = 0; i < len;

问题 I have an object of nested objects and would like to sort by one of the nested values (e.g. "month_sales" descending). This is what the data looks like: { "Bob": { sales: 13, revenue: 33, month_sales: 149 }, "Bill": { today_sales: 20, week_sales: 38, month_sales: 186 }, "Jane": { today_sales: 17, week_sales: 38, month_sales: 164 } } This is what I want it to look like (sort by month_sales descending): { "Bill": { today_sales: 20, week_sales: 38, month_sales: 186 }, "Jane": { today_sales: 17,

问题 How to get from this array [ {name: "a", weight: 1}, {name: "b", weight: 3}, {name: "a", weight: 5}, {name: "b", weight: 7} ] get this array(weight of duplicates summed) [ {name: "a", weight: 6}, {name: "b", weight: 10} ] 回答1: Something like this should work using groupBy reduce and pluck : var sum = function(a,b){ return a+b; }; _.chain([ {name: "a", weight: 1}, {name: "b", weight: 3}, {name: "a", weight: 5}, {name: "b", weight: 7} ]).groupBy('name') // we first group them by name .map