lodash

问题 I implemented a mixin to add "or" condition with _.where var arr = [{a:1,b:4}, {a:5}, {a:6}, {a:11}]; _.mixin({ or: function(obj,arr,condition){ return _.chain(arr).where(condition).union(obj).value(); } }); now i can use it like this and it works perfectly somewhat like a sql query _.chain(arr).where({a:1}).or(arr,{a:11,b:3}).or(arr,{a:2}).value(); //returns [{a:1,b:4}] _.chain(arr).where({a:1}).or(arr,{a:11}).or(arr,{a:2}).value(); //returns [{a:1,b:4},{a:11}] _.chain(arr).where({a:1}).or

问题 I can't figure out how to find the intersection of this set of arrays: [ [ {"name":"product1","light":"1"}, {"name":"product2","light":"2"}, {"name":"product5","light":"5"}, {"name":"product4","light":"4"} ], [ {"name":"product2","light":"2"}, {"name":"product3","light":"3"}, {"name":"product4","light":"4"} ],[...more arrays with objects] ] This is just sample data , the real set I have changes a lot but with that structure. I want the returned intersection to look like this (a single array

问题 This is a question similar to How to remove undefined and null values from an object using lodash?. However, the solutions proposed there do not conserve the constructor. In addition to that, I want to only delete those keys which starts, say with '_'. Here is what I am looking for, and can't seem to manage to get from lodash : Input : new Cons({key1 : 'value1', key2 : {key21 : 'value21', _key22: undefined}, key3: undefined, _key4 : undefined}) Output : {key1 : 'value1', key2 : {key21 :

问题 This is a question similar to How to remove undefined and null values from an object using lodash?. However, the solutions proposed there do not conserve the constructor. In addition to that, I want to only delete those keys which starts, say with '_'. Here is what I am looking for, and can't seem to manage to get from lodash : Input : new Cons({key1 : 'value1', key2 : {key21 : 'value21', _key22: undefined}, key3: undefined, _key4 : undefined}) Output : {key1 : 'value1', key2 : {key21 :

问题 Is there a way in lodash to check if a strings contains one of the values from an array? For example: var text = 'this is some sample text'; var values = ['sample', 'anything']; _.contains(text, values); // should be true var values = ['nope', 'no']; _.contains(text, values); // should be false 回答1: Another solution, probably more efficient than looking for every values, can be to create a regular expression from the values. While iterating through each possible values will imply multiple

问题 Lets say I have an object filter: { "ID": false, "Name": true, "Role": false, "Sector": true, "Code": false } I want to set all keys to false (to reset them). What's the best way to do this, I'd like to avoid looping with foreach and stuff. Any neat one liner? 回答1: Using lodash, mapValues is a graceful, loop-free way: filter = { "ID": false, "Name": true, "Role": false, "Sector": true, "Code": false }; filter = _.mapValues(filter, () => false); If you want to do this with Underscore.js, there

问题 Looking at the documentation for ES6 Object.assign and Lodash _.assign it looks like these function in exactly the same way. Is that a correct understanding? Or am I missing something? 回答1: Depends on the browser. Per the lodash docs: Made _.assign use built-in Object.assign when available. You can go here for browser support: Basically, IE doesn't have support so lodash's code is used in that case MDN Docs on Object.assign 来源： https://stackoverflow.com/questions/37123425/object-assign-vs

问题 A glance at the Lo-Dash docs shows that the API falls in to categories of: Arrays, Chaining, Collections, Functions, Objects, Utilities, Methods, and Properties A more detailed look in to the Arrays API shows approximately 30 different methods available that are applicable to arrays. The Collections API has a few more methods than the Arrays API, and they do not share the same methods. Within the Collections API, a collection is described as an object that is iterated, and may be an array:

问题 I want to Filter an array of objects with another array of object.The logic will be used in product search by category and color etc. This is my main Array : products: [{ id: 1, name: 'Product 1', category: 'Home', skill: 'Easy', color: 'blue', price: 100.00 }, { id: 2, name: 'Product 2', category: 'Home', skill: 'Intermediate', color: 'red', price: 120.00 }, { id: 3, name: 'Product 3', category: 'Office', skill: 'Intermediate', color: 'green', price: 190.00 }, { id: 4, name: 'Product 4',

问题 My collection looks like this. var list = [{id:'12345', sequence:null}, {id:'12346', sequence:null}, {id:'12347', sequence:null}, {id:'12348', sequence:1}, {id:'12348', sequence:2}, {id:'12349', sequence:1}, {id:'12349', sequence:1}]; I am trying to get a unique list so that object with same id AND sequence will only return one of the objects (we have 2 here- {id:'12349', sequence:1}) my code var uniqueList = _.uniq(list, function(obj) { return obj.id && obj.sequence; }); can we use lodash