if-statement

问题 I found that there are many if-else statements, especially nested if else statements, these statements make my code less readable. How to reduce the number of if else statements in PHP? My tips are as follows: 1.Use a switch statement when it is suitable; 2.use exit() statement when it is feasible; 3. Use ternary statement when it is feasible; Are there other tips that can reduce if else statements, especially nested if-else statements? 回答1: Refactor your code into smaller work units. Too

问题 Okay i know this is a newb question, but how would i go about only performing IF 2 if IF 1 (text: test appears in data string.) I've tried combining the two but end up with all sorts of issues. So if test doesnt show up the loops skipped, if it does then the regex code i have in IF 2 will be ran. $data = 'hello world "this is a test" last test'; // IF 1 if (stripos($data, 'test') !== false) { } // IF 2 if (preg_match('/"[^"]*"/i', $data, $regs)) { $quote = str_word_count($regs[0], 1); $data =

问题 'Hello ' + ('there' if name is None else name) Is the equivalent of msg = 'Hello ' if name is None: msg += 'there' else: msg += name What is the equivalent of this: msg = 'Hello ' if name is None: msg += 'there' elif name == 'Mr Anderson' msg += 'Neo' else: msg += name EDIT: for reference here is the code I wanted to shrink srepr = '\'Modify ' if self.register == 'p': srepr += 'Pointer' elif self.register == 'v': srepr += 'Value' else srepr += 'Unknown' srepr += ' By ' + str(self.delta) + '\'

问题 I have a signup view controller where the user needs to enter an email address, a username, and a password. For the username and password fields, right now you can currently sign up with a username like "user%$&" and a password like "password%^&$". I don't want people to be able to use these special characters. I want to make it so that the username and password fields can only be submitted with alphanumeric characters aka letters and numbers. I have found some methods to do this, but they

问题 How can I check if a div contains a certain word? var divs= document.getElementsByTagName('div'); for (var i = 0, len = divs.length; i < len; ++i) { if (divs[i].text = '*word*'){ //do somthing } } doesn't work. 回答1: use the indexOf function if(divs[i].innerHTML.indexOf("word") !== -1) { // something } 回答2: Use includes() : node.textContent.includes('Some text'); 回答3: if (document.getElementById('divId').innerHTML.indexOf("word") != -1) { } 回答4: Try the String.indexOf() function: if (divs[i]

问题 I'm trying to setup a Makefile that will search and copy some files (if-else condition) and I can't figure out what exactly is wrong with it? (thou I'm pretty sure it's because a combination of spaces/tabs written in the wrong place). Can I get some help with it, please? Here's what I have currently: obj-m = linuxmon.o KDIR = /lib/modules/$(shell uname -r)/build UNAME := $(shell uname -m) all: $(info Checking if custom header is needed) ifeq ($(UNAME), x86_64) $(info Yes) F1_EXISTS=$(shell [

问题 Hi I'm very new with programming in python. I'm starting my first program but i'm having a little trouble.. is there a better way of doing the snippet of code below? When i run the program I get "yes_no" not defined. def main(): print "\n Welcome to registration. Are you an authorized user?\n" yes_no = raw_input("Yes or No?: ") if yes_no in ("Yes", "yes"): return oldUser() elif yes_no in ("y", "Y"): print ("Please enter YES") return wrong() elif yes_no in ("n", "N"): return wrong() else:

问题 This question already has answers here : While statement not working? (2 answers) Closed 5 years ago . when I try to run this game and wants to end it by typing "slut" or "Slut" (Swedish for 'end') it makes a new player call "slut" or "Slut" BUT when I only have ONE statement in the while loops or If statements it's all working. To make it more clear It works when I have (playerName != "Slut") but I want for safty have (playerName != "Slut") || (playerName != "slut") and then it wont work.

问题 I have following piece of code: if day > 31 day -= 31 month = "April" end Can I write it in one line different than: if day > 31 then day -= 31 and month = "April" end ? I've tried it like: if day > 31 {day -= 31; month = "April"} But it doesn't work 回答1: (day -= 31; month = "April") if day > 31 Alternate way (As suggested by @mudasobwa in comments below) : day, month = day - 31, "April" if day > 31 来源： https://stackoverflow.com/questions/27166803/one-line-if-statement-in-ruby

问题 *EDIT / FINISHED SOLUTION / WORKING CODE So, this is what a friend of mine helped me come up with. Here is the part I use in my K2 "items.php" file: <div class="fb-comments" data-href="<?php echo JURI::current(); ?>" data-num-posts="8" notify="true" data-width="580"></div> <input id="authname" style="display: none;" type="text" value="<?php echo $this->item->author->name; ?>" /> <input id="authmail" style="display: none;" type="text" value="<?php echo $this->item->author->email; ?>" /> <input