conditional-statements

问题 I'm making a Rock-Paper-Scissors-Lizard-Spock (Big Bang Theory, the tv show) using ReactJS and i'm facing some kind of abstract issue. switch (this.state.playerOnePick === 'Rock') { case((this.state.playerTwoPick === 'Scissors') || (this.state.playerTwoPick === 'Lizard')): return ( <div> <h1>Player One wins !</h1> <h2>P1: {this.state.playerOnePick} P2: {this.state.playerTwoPick}</h2> </div> ); break; case((this.state.playerTwoPick === 'Paper') || (this.state.playerTwoPick === 'Spock')):

问题 I've to add a notification module on an existing project. My table structure is like on the pic. Picture : as you see on the picture every notification has a type and a releatedID. Type 1 = reservation is cancelled, releated ID is the id on "reservations" table Type 3 = account balance is under the given min. limit so releatedID is the id on "account_movements" table what I'm trying to do is a conditional join to avoid 2 different sql queries; Get all notifications which are belong to the

问题 I have a table like this: When a user clicks on an Edit button, an <input> should appear in its place. If a user clicks on another Edit button, this one will also be replaced with an <input> , and the previous <input> should disappear and show an Edit button again. In short, only one field can be in edit mode at a time. This is my initial state : state = { editnameEnable: false, editemailEnable: false, editaddressEnable: false, edittelephone_noEnable: false, } This is my edit() method: edit =

问题 I made an application with an SQLite database. I want to show the data in a listview, but I don't want to show all the data from the database, but just some data. So, I want to add a condition. I only want to show the data where string 'dag' is 'maandag'. Can anyone help me? This is the code from my DatabaseHelper, where the database is created: package com.persoonlijk.rooster.test2; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase;

问题 This question already has answers here : JavaScript Infinitely Looping slideshow with delays? (10 answers) Closed last year . I was wondering why this code crash my browser: while (true) { $('.selector') .animate({ 'bottom': '30px' }, 500) .animate({ 'bottom' : '20px' }, 500); } and this other code works (without true as a condition) var a = 0; while (a < 1000) { $('.selector') .animate({ 'bottom': '30px' }, 500) .animate({ 'bottom' : '20px' }, 500); a++; } If i would dare to answer the

问题 I need to use the following syntax to filter the list operations : a = [ope for ope in operations if ope[0] == 1] The if statement condition is variable and may contain multiple conditions: a = [ope for ope in operations if ope[0] == 1 and ope[1] == "test"] I use a function to build the condition and return it as a string: >>>> c = makeCondition(**{"id": 1, "title": 'test'}) >>>> c "ope[0] == 1 and ope[1] == 'test'" Is there a way to integrate the c variable into the list filtering? Something

问题 I need to use the following syntax to filter the list operations : a = [ope for ope in operations if ope[0] == 1] The if statement condition is variable and may contain multiple conditions: a = [ope for ope in operations if ope[0] == 1 and ope[1] == "test"] I use a function to build the condition and return it as a string: >>>> c = makeCondition(**{"id": 1, "title": 'test'}) >>>> c "ope[0] == 1 and ope[1] == 'test'" Is there a way to integrate the c variable into the list filtering? Something

问题 I can not figure out how to query a SQLite. needed: 1) Replace the record (the primary key), if the condition (comparison of new and old fields entries) 2) Insert an entry if no such entry exists in the database on the primary key. Importantly, it has to work very fast! I can not come up with an effective inquiry. Edit. MyInsertRequest - the desired expression. Script: CREATE TABLE testtable (a INT PRIMARY KEY, b INT, c INT) INSERT INTO testtable VALUES (1, 2, 3) select * from testtable 1|2|3

问题 I have data date id request 0 2016-06-17 09:25:05 yans.bouts@yandex.ru GET HTTP/1.1 1 2016-06-17 09:25:07 yans.bouts@yandex.ru POST HTTP/1.1 2 2016-06-17 09:25:47 yans.bouts@yandex.ru CONNECT HTTP/1.1 3 2016-06-17 09:25:47 yans.bouts@yandex.ru POST HTTP/1.1 4 2016-06-17 09:25:49 yans.bouts@yandex.ru CONNECT HTTP/1.1 I need to iterate string and 'GET' not in df['request'] I want to delete string from df. Desire output date id request 0 2016-06-17 09:25:05 yans.bouts@yandex.ru GET HTTP/1.1 I

问题 This question already has answers here : Java: Infinite Loop Convention [closed] (5 answers) Closed 5 years ago . Can someone explain what is the condition for this for loop? for(;;) { //do sth. } 回答1: It has no condition. It's an infinite loop. 回答2: If the test condition is empty (and it is here), there is no test and the loop continues indefinitely. It's a short form for an infinite loop. 回答3: It is an infinite loop as the condition is empty. From the java specs If the Expression is not