lodash

Sum up array with objects

由 倾然丶 夕夏残阳落幕 提交于 2019-12-11 02:49:34
问题 I am having the following array with objects and I would like to sum up all occurrences of watt : let allProducts = [{ "unique_id": "102", "currency": "$", "price": "529.99", "watt": 150 }, { "unique_id": "11", "currency": "$", "price": "323", "watt": 150 }, { "unique_id": "13", "currency": "$", "price": "23", "watt": 77 } ] let getWatt = _(allProducts) .map((objs, key) => ({ 'watt': _.sumBy(objs, 'watt') })) .value() console.log(getWatt) <script src="https://cdnjs.cloudflare.com/ajax/libs

Redux, normalised entities and lodash merge

由 旧街凉风 提交于 2019-12-11 02:40:00
问题 I'm using Redux, React and Lodash with a fairly standard normalized entities store. When I merge in new entities in a redux reducer, the references to all my existing entities change (despite not being modified), causing any pure components to re-render. Is there an alternative to lodash's merge that can merge whilst maintaining the existing references to values that are not in the object being merged in? let entities = { [1]: {a: true }, [2]: {a: true, b: true }, } let response = { [2]: {a:

What has changed in Lodash from 3 to 4 that this code is not working?

由 半世苍凉 提交于 2019-12-11 02:37:17
问题 I have a code like this: const _ = require('lodash'); const fn = _.partialRight(_.pick, _.identity); const x = { some: 'value', empty: null }; const y = fn(x); console.log('x:', x); console.log('y:', y); fn is supposed to remove empty properties Result with Lodash 3.10.1: x: { some: 'value', empty: null } y: { some: 'value' } Result with Lodash 4.15.0: x: { some: 'value', empty: null } y: {} What has changed in Lodash 4 that it's not working anymore? 回答1: change your const fn = _.partialRight

How to configure babel correctly to use lodash-es?

由 左心房为你撑大大i 提交于 2019-12-11 02:21:44
问题 I need to use lodash-es in my project, but I can't configure my babel correctly, it always reports errors like SyntaxError: Unexpected identifier hello.js import upperCase from 'lodash-es/upperCase' console.log(upperCase('lodash-es')); package.json { "scripts": { "demo": "babel-node hello" }, "devDependencies": { "@babel/cli": "^7.0.0", "@babel/core": "^7.0.0", "@babel/node": "^7.0.0", "@babel/preset-env": "^7.0.0" }, "dependencies": { "lodash-es": "4.17.11" } } .babelrc { "presets": [ "

lodash: get object from an array of objects - deep search and multiple predicates

由 耗尽温柔 提交于 2019-12-11 01:58:30
问题 I have this: objs = { obj1 : [{ amount: 5, new: true }, { amount: 3, new: false }], obj2: [{ amount: 1, new: true }, { amount: 2, new: false }] } And I want get one object where new: true and with maximum value of amount result = { amount: 5, new: true } 回答1: With lodash 4.x: var objs = { obj1 : [{ amount: 5, new: true }, { amount: 3, new: false }], obj2: [{ amount: 10, new: true }, { amount: 2, new: false }] }; var result = _(objs) .map(value => value) .flatten() .filter(obj => obj.new)

Angular 2 / Angular 2 CLI / lodash functions not found

由 无人久伴 提交于 2019-12-11 01:56:27
问题 We are getting the error with angular-cli beta 18 Error: Uncaught (in promise): TypeError: __WEBPACK_IMPORTED_MODULE_6_lodash__.find is not a function Lodash + Types were added to the package.json: - "lodash": "4.14", "@types/lodash": "4.14.38", In the scripts section of angular-cli.json we have a reference to the module "../node_modules/lodash/lodash.js", We are importing lodash using: - import * as _ from 'lodash'; The compiled scripts.bundle.js has the lodash javascript included. Is there

How can I merge an array of objects?

由 我们两清 提交于 2019-12-11 01:03:44
问题 Say I had an array of articles, each article may or may not have more than 1 image object, now since mysql can't group together objects, you have to do it yourself. So the result is you getting near duplicate article objects...where the only difference is the image object. By near duplicate i mean the only difference in the returned result is the image object. I'm trying to find a way to loop through the articles array and elimate duplicate objects and create an images array which will hold

Why the name 'underscore' or 'lodash'?

由 喜你入骨 提交于 2019-12-11 00:27:08
问题 Why are these libraries named after _ ? Is there some significance behind it or the reason is "Just because we can" ? As far as i know, underscore and lodash do a lot of similar stuff. Also, both the names point to _ Even their variable names are _ So is there some relation of _ with the working of these libraries? Or its just a name? 回答1: Lodash From my understanding of the history of the two, lodash was meant as a lightweight replacement for underscore. So lodash is effectively a play on

Group Multiple Objects Based on Type Using lodash

由 帅比萌擦擦* 提交于 2019-12-11 00:17:03
问题 I want to group unordered-list-item and ordered-list-item . Below is the original structure: { data: { areas: [{ sections: [{ rjf: [ { type: "unordered-list-item", text: "Item 1", }, { type: "unordered-list-item", text: "Item 2", }, { type: "paragraph", text: "This is text", }] }] }] } } Now I want to group all list items into a new object. So the expected structure is: { data: { areas: [{ sections: [{ rjf: [ { type: "list", items: [{ type: "unordered-list-item", text: "Item 1", }, { type:

Nodejs基本介绍和应用

由 夙愿已清 提交于 2019-12-10 23:24:31
1.什么是Nodejs? Nodejs是一个基于 Chrome V8 引擎的JavaScript运行时（ 运行环境 ）。 2.Nodejs的简单应用。 1.使用module.exports对象导出模块成员 (每个模块内部都有一个 module 对象，代表当前模块，我们可以使用它的 exports 属性导出模块成员。该属性的初始值为一个空对象，我们只需要将被导出的成员添加为该对象的属性即可。) // 模块私有的成员 function add ( x , y ) { return x / y ; } // 如果我们想导出某个成员的话，只需要将它添加为 module.exports 对象的属性即可。 // 模块导出的成员add module . exports . add = function ( x , y ) { return x + y ; } ; 2.使用module.exports的别名：exports对象 (为了方便导出模块成员，Node.js为每个模块提供了一个 exports 对象， exports 对象的初始值与 module.exports 对象的初始值相同，也就是说exports对象与module.exports对象指向同一个对象。)我们可以用如下代码解释： var exports = module.exports = {}; exports . add =
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