loops

问题 I have an array of object that have different values like items=[{id:1,category:"cat_1" , title:"My title 1"},{id:2,category:"cat_2" , title:"My title 2"},{id:6,category:"cat_1" , title:"Another title 1"},{id:1,category:"cat_3" , title:"My title 3"},{id:8,category:"cat_1" , title:"Third Title"},{id:2,category:"cat_2" , title:"Another title 2 "}] I use array map to list the object and display them as { items.map((item) => ( <h1>{item.category}</h1> <p>{item.title}</p> ))} My question is how do

问题 This question already has answers here : How to get the difference between two arrays in JavaScript? (67 answers) Closed 3 years ago . I have 2 arrays as follows. I want to compare both arrays and only provide the elements from 'check' which are not present in 'data' array. var check= ["044", "451"], data = ["343", "333", "044", "123", "444", "555"]; The function used is as follows. This function will result in providing the elements in 'check' array which are present in 'data' array function

问题 This question already has answers here : How to get the difference between two arrays in JavaScript? (67 answers) Closed 3 years ago . I have 2 arrays as follows. I want to compare both arrays and only provide the elements from 'check' which are not present in 'data' array. var check= ["044", "451"], data = ["343", "333", "044", "123", "444", "555"]; The function used is as follows. This function will result in providing the elements in 'check' array which are present in 'data' array function

问题 I know this topic appeared on SO a few times, but the examples were often more complicated and I would like to have an answer (or set of possible solutions) to this simple situation. I am still wrapping my head around R and programming in general. So here I want to use lapply function or a simple loop to data list which is a list of three lists of vectors. data1 <- list(rnorm(100),rnorm(100),rnorm(100)) data2 <- list(rnorm(100),rnorm(100),rnorm(100)) data3 <- list(rnorm(100),rnorm(100),rnorm

问题 I am trying to develop a program that shuffles a deck by dividing the deck into two and then interlacing them. Class Deck represents a deck of 52 cards. There are two methods: Deck(int n) and Card drawCard() . Deck(int n) is the constructor. The parameter tells how many rounds the deck should be shuffled. In each round of shuffling, the whole deck is first divided into two sub-decks. The sub-decks are then interlaced into one whole deck. Some notes : To simplify the discussion, we assume the

问题 I am trying to develop a program that shuffles a deck by dividing the deck into two and then interlacing them. Class Deck represents a deck of 52 cards. There are two methods: Deck(int n) and Card drawCard() . Deck(int n) is the constructor. The parameter tells how many rounds the deck should be shuffled. In each round of shuffling, the whole deck is first divided into two sub-decks. The sub-decks are then interlaced into one whole deck. Some notes : To simplify the discussion, we assume the

问题 I have a list of pairs, representing all edges of cluster in a graph. Actually the list is bigger than this. This is just an example. [[1, 2], [2, 1], [3, 5], [6, 3], [3, 6]] [1, 2] means an edge between nodes 1 and 2, and so does [2, 1] . So, I have some difficulty to eliminate the repeated pairs to count the in-degrees of the cluster. The output should be like [[1, 2], [3, 5], [3, 6]] or [[2, 1], [3, 5], [6, 3]] 回答1: If order of the pairs' elements is irrelevant, then use sorted to

问题 I have an array of objects and render every item inside it in input and under this section, I have a button that does something I want to check every item "input" if it's empty don't call a function pressed on the button my code works for first object not all, state toolsUsed: [ { id: 0, name: '..', price: '..', count: '..', }, { id: 1, name: '..', price: '..', count: '..', }, ... ], ] here's my iterable array renderToolsUsed = () => { const {toolsUsed} = this.state; return toolsUsed.map((

问题 as a follow up on my question original question posted here UPDATE in Batches Does Not End and Remaining Data Does Not Get Updated If you use the logic below you'll see that update never finishes. Let me know if you have any ideas why... Table 1 IF OBJECT_ID('tempdb..#Table2') IS NOT NULL BEGIN DROP TABLE #Table2; END CREATE TABLE #Table2 (ID INT); DECLARE @Count int = 0; WHILE (select count(*) from #Table2) < 10000 BEGIN INSERT INTO #Table2 (ID) VALUES (@Count) -- Make sure we have a unique

问题 This question was migrated from Computer Science Stack Exchange because it can be answered on Stack Overflow. Migrated 25 days ago . I am new to this platform and not sure how to write it as code. And I’ve tried doing this question different ways but my value of pi is 3.414 so I am not sure where I am going wrong. from math import sqrt root = sqrt(2) denominator = sqrt(2 + root) while 2 * (2 / sqrt(2 + denominator) > 1): denominator *= denominator pi = denominator print("Approximation of pi: