lodash

问题 I want to get the first n key/value pairs from an object (not an array) using lodash. I found this answer for underscore, which says to use use first (doesn't exist in lodash), or to use take (only works on arrays). Sample node session trying to get the 'a:7' and 'b:8' pairs from an object: > var ld=require("lodash") undefined > var o={a:7, b:8, c:9} undefined > ld.keys(o) [ 'a', 'b', 'c' ] > ld.take(o, 2) [] > ld.first(o, 2) undefined > Surely, there must be some easy way to do this with

问题 I want to get the first n key/value pairs from an object (not an array) using lodash. I found this answer for underscore, which says to use use first (doesn't exist in lodash), or to use take (only works on arrays). Sample node session trying to get the 'a:7' and 'b:8' pairs from an object: > var ld=require("lodash") undefined > var o={a:7, b:8, c:9} undefined > ld.keys(o) [ 'a', 'b', 'c' ] > ld.take(o, 2) [] > ld.first(o, 2) undefined > Surely, there must be some easy way to do this with

问题 I'm using lodash to call a debounce function on a component like so: ... import _ from 'lodash'; export default { store, data: () => { return { foo: "", } }, watch: { searchStr: _.debounce(this.default.methods.checkSearchStr(str), 100) }, methods: { checkSearchStr(string) { console.log(this.foo) // <-- ISSUE 1 console.log(this.$store.dispatch('someMethod',string) // <-- ISSUE 2 } } } Issue 1 is that my method checkSearchStr doesn't know about foo Issue 2 is that my store is undefined as well

问题 I understand that debounce in Undercore.js returns a function that will postpone its execution until the wait time is over. My question is, is there an advantage of using debounce over the regular setTimeout function in vanilla Javascript? Don't they both work the same? 回答1: They are very different and used in completely different cases. _.debounce returns a function , setTimeout returns an id which you can use to cancel the timeOut. No matter how many times you call the function which is

问题 I understand that debounce in Undercore.js returns a function that will postpone its execution until the wait time is over. My question is, is there an advantage of using debounce over the regular setTimeout function in vanilla Javascript? Don't they both work the same? 回答1: They are very different and used in completely different cases. _.debounce returns a function , setTimeout returns an id which you can use to cancel the timeOut. No matter how many times you call the function which is

问题 I fetching data form database and I want to send response date wise. I want little bit of help in group By my data with date wise. I have Object like as below var IHAVE = [{ "foodId": "59031fdcd78c55b7ffda17fc", "qty": 1, "dateTime": "2017-07-26T12:03:06.000Z", "_id": "591c3bfcca93e86c3450a537" }, { "foodId": "59031fdcd78c55b7ffda17fc", "qty": 1, "dateTime": "2017-05-18T04:21:13.000Z", "_id": "591d213b6878badb0621b840" }, { "foodId": "59031fdcd78c55b7ffda17fc", "qty": 1, "dateTime": "2017-07

问题 I'm trying to remove objectst from an array which have 4 identical values and 1 unique. A quick google search gives a lot of options for removing identical objects from an array, but not objects that are similar . Example of array: var data = [ {Date: "2016-04-27T09:03:45Z", Name: "Tito", Title: "Developer", Department:"IT", Company: "XXX"}, {Date: "2016-04-27T08:07:45Z", Name: "Tito", Title: "Developer", Department:"IT", Company: "XXX"}, {Date: "2016-04-27T10:23:45Z", Name: "Tito", Title:

问题 I'm trying to remove objectst from an array which have 4 identical values and 1 unique. A quick google search gives a lot of options for removing identical objects from an array, but not objects that are similar . Example of array: var data = [ {Date: "2016-04-27T09:03:45Z", Name: "Tito", Title: "Developer", Department:"IT", Company: "XXX"}, {Date: "2016-04-27T08:07:45Z", Name: "Tito", Title: "Developer", Department:"IT", Company: "XXX"}, {Date: "2016-04-27T10:23:45Z", Name: "Tito", Title:

问题 Background Assume we all know about the debounce function from lodash . If a user quickly input 1 , 12 , 123 , 1234 , it allows us to proceed an alert only once, with 1234 , after a certain delay time. This is quite used to reduce request amount, for optimization. Description For a normal input field, we can use that kind of debounce and it works. Problem : Once we add a setState inside the same callback with debounce , the debounce won't work as normal. Does anyone know the reason? import

问题 Background Assume we all know about the debounce function from lodash . If a user quickly input 1 , 12 , 123 , 1234 , it allows us to proceed an alert only once, with 1234 , after a certain delay time. This is quite used to reduce request amount, for optimization. Description For a normal input field, we can use that kind of debounce and it works. Problem : Once we add a setState inside the same callback with debounce , the debounce won't work as normal. Does anyone know the reason? import