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What is a Question Mark “?” and Colon “:” Operator Used for? [duplicate]
...ternary operator but not the ternary operator. Major languages (C#, Java, PHP) consider it a conditional operator, and call it the ?: operator. Occasionally (JavaScript) it is called the conditional operator.
– Sheepy
May 30 '14 at 8:02
...
How to do a GitHub pull request
...ng sure your patch is still working) will update the pull request automagically (no need to click on anything)
update that branch: if your pull request is rejected, you simply can add new commits, and/or redo your history completely: it will activate your existing pull request again.
"focus" that br...
@try - catch block in Objective-C
...
All work perfectly :)
NSString *test = @"test";
unichar a;
int index = 5;
@try {
a = [test characterAtIndex:index];
}
@catch (NSException *exception) {
NSLog(@"%@", exception.reason);
NSLog(@"Char at index %d cannot be found", index);
NSLog(@"Max index is: %lu", [...
解决：Apache is running a threaded MPM,but your PHP Modle is not compi...
解决：Apache is running a threaded MPM,but your PHP Modle is not compiled to be threadsafe. You need to recompile PHP.Apache和PHP环境运行时报错：Apache is running a threaded MPM,but your PHP Modle is not compiled to be threadsafe. Yo...Apache和PHP环境运行时报错：Apache is runnin...
【解决】linux apache2 php7 不解析php文件的几种可能 - 更多技术 - 清泛网...
【解决】linux apache2 php7 不解析php文件的几种可能linux-apache2-php7-not-execute1、可能是没启用php模块导致，解决方法：a2enmod php7 0systemctl restart apache22、正常情况下，启用php模块后无需其他配置，就能自动识别php文件，如果还是不行请...
How to add elements to an empty array in PHP?
...ration, but it also doesn't impose the performance overhead of a function call, which array_push() would. Edit: But, great answer. Effectively the same, and majority of uses won't even notice a performance difference, but helps to know those nuances.
– Mattygabe
...
Mongoose subdocuments vs nested schema
...o that will completely kill your
application's performance and that's to index this ever-increasing
array. What that means is that every single time the document with
this array is relocated, the number of index entries that need to be
updated is directly proportional to the number of indexe...
How much faster is Redis than mongoDB?
...s()
mongo = Connection().test
collection = mongo['test']
collection.ensure_index('key', unique=True)
def mongo_set(data):
for k, v in data.iteritems():
collection.insert({'key': k, 'value': v})
def mongo_get(data):
for k in data.iterkeys():
val = collection.find_one({'key':...
Get the index of the object inside an array, matching a condition
...
As of 2016, you're supposed to use Array.findIndex (an ES2015/ES6 standard) for this:
a = [
{prop1:"abc",prop2:"qwe"},
{prop1:"bnmb",prop2:"yutu"},
{prop1:"zxvz",prop2:"qwrq"}];
index = a.findIndex(x => x.prop2 ==="yutu");
console.log(index);
...
How to use the 'main' parameter in package.json?
...meter in your package.json if the entry point to your package differs from index.js in its root folder. For example, people often put the entry point to lib/index.js or lib/<packagename>.js, in this case the corresponding script must be described as main in package.json.
You can't have two scr...