lodash

问题 Here is a code snippet of an update method using express.js and mongoose. I'm trying to merge the existing mongo entity with the json object from the request payload body. exports.update = function(req, res) { if(req.body._id) { delete req.body._id; } Entity.findById(req.params.id, function (err, entity) { if (err) { return handleError(res, err); } if(!entity) { return res.send(404); } var updated = _.merge(entity, req.body); updated.save(function (err) { if (err) { return handleError(res,

问题 I have the following object: data = [ { name: 'foo', type: 'fizz', val: 9 }, { name: 'foo', type: 'buzz', val: 3 }, { name: 'bar', type: 'fizz', val: 4 }, { name: 'bar', type: 'buzz', val: 7 }, ]; And used lodash map: result = _.map(data, function item, idx){ return { key: item[key], values: item.value, } } Which results in: [ { key: foo, val: 9 }, { key: foo, val: 3 }, { key: bar, val: 4 }, { key: bar, val: 7 }, ] but now I'm trying to return: [ { key: 'foo', val: 12 }, { key: 'bar', val: 11

问题 Closed . This question needs details or clarity. It is not currently accepting answers. Want to improve this question? Add details and clarify the problem by editing this post. Closed 4 years ago . I have an array that contains filenames at each index. I want to download those files one at a time (synchronously). I know about ' Async ' module. But I want to know whether any functions in Lodash or Underscore or Bluebird library supports this functionality. 回答1: You can use bluebird's Promise

问题 Lets say my object looks like the below. Its a mix of different arrays and parents, no hierarchical order. e.g. "person": { "id": 12345, "name": "John Doe", "emergencyContacts": [ { "name": "Jane Doe", "phone": "888-555-1212", "relationship": "spouse", "moreDetails": { "id": 12345, "phones": {}, "home": "800-123-4567", "mobile": "877-123-1234" } }, { "name": "Justin Doe", "phone": "877-123-1212", "relationship": "parent", "mobile": "877-123-1234" } ], "workContacts": [ { "name": "Jane Doe",

问题 I am using angular-cli in angular2 rc1 for development. I have installed lodash node_module through npm and configured it in systemjs using following: system.config.ts /*********************************************************************************************** * User Configuration. **********************************************************************************************/ /** Map relative paths to URLs. */ const map: any = { }; /** User packages configuration. */ const packages: any =

问题 I have an array of an object like this [ { 'a': 10, elements: [ { 'prop': 'foo', 'val': 10 }, { 'prop': 'bar', 'val': 25 }, { 'prop': 'test', 'val': 51 } ] }, { 'b': 50, elements: [ { 'prop': 'foo', 'val': 30 }, { 'prop': 'bar', 'val': 15 }, { 'prop': 'test', 'val': 60 } ] }, ] What I need is sum the property Val when prop is foo . So, I have to search through elements and get all objects where prop is foo . With this objects, I should sum the val property. I tried to use many combinations of

问题 I want to create a object in JavaScript which will store values in key, value pair and I should be able to pass some key and should be able to get its value back. In .NET world we can use dictionary class for this kind of implementation. Do we have any option in JavaScript world? I am using ExtJs 4.1, so if you know of any option in ExtJS even that would work. I have tried something like this but I cannot get value by key. var Widget = function(k, v) { this.key = k; this.value = v; }; var

问题 I have a large javascript array of some people Bought a car in different years. the simplified array is like this: const owners = [{ name: "john", hasCar: true, yearBought: 2002 }, { name: "john", hasCar: true, yearBought: 2005 }, { name: "mary", hasCar: true, yearBought: 2015 }, { name: "john", hasCar: true, yearBought: 2018 }] if a person has more than one car (like John in this example), there is different objects for him with different years he has bought the car. I want to merge objects

问题 I have 2 arrays of objects, they each have an id in common. I need a property from objects of array 2 added to objects array 1, if they have matching id s. Array 1: [ { id: 1, name: tom, age: 24 }, { id: 2, name: tim, age: 25 }, { id: 3, name: jack, age: 24 }, ] Array 2: [ { id: 1, gender: male, eyeColour: blue, weight: 150 }, { id: 2, gender: male, eyeColour: green, weight: 175 }, { id: 3, gender: male, eyeColour: hazel, weight: 200 }, ] Desired Outcome: [ { id: 1, name: tom, age: 24,

问题 I have a set of two arrays. One contains some fruit values as strings, the other one contains some random numbers. Here I considered the number arrays are the indexes of the fruits array. How to get a new array of fruits given the numbers in the index array? Sample code: var resultArr = []; var fruitier = ["apple", "orange", "grapes", "pineapple", "fig", "banana", "jackfruit", "pomegranate"]; var indexArr = [0, 2, 4]; Output: resultArr = ["apple", "grapes", "fig"]; 回答1: for(var i = 0; i <