大约有 7,000 项符合查询结果（耗时：0.0181秒） [XML]
How to return multiple lines JSX in another return statement in React?
...urn an array as part of rendering a component, e.g <div>{ this.props.foos.map(function() { return <Foo /> }) }</div>. But the render function of the component can't return that array without wrapping it, e.g. in a div.
– Henrik N
Jul 2 '16 at ...
“Java DateFormat is not threadsafe” what does this leads to?
...ed to create separate format instances for each thread.
So, in case your Foo.handleBar(..) is accessed by multiple threads, instead of:
public class Foo {
private DateFormat df = new SimpleDateFormat("dd/mm/yyyy");
public void handleBar(Bar bar) {
bar.setFormattedDate(df.format(b...
How to split a string, but also keep the delimiters?
...t("'ab','cd','eg'")));
System.out.println(Arrays.toString(p.split("boo:and:foo")));
output:
[', ab, ',', cd, ',', eg, ']
[boo, :, and, :, foo]
EDIT: What you see above is what appears on the command line when I run that code, but I now see that it's a bit confusing. It's difficult to keep trac...
How to change column order in a table using sql query in sql server 2005?
...nstead of using * for the 'default' order.
original query:
select * from foobar
returns
foo bar
--- ---
1 2
now write
select bar, foo from foobar
bar foo
--- ---
2 1
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improv...
How to output only captured groups with sed?
...ing parentheses and output what you capture using a back reference:
echo "foobarbaz" | sed 's/^foo\(.*\)baz$/\1/'
will output "bar". If you use -r (-E for OS X) for extended regex, you don't need to escape the parentheses:
echo "foobarbaz" | sed -r 's/^foo(.*)baz$/\1/'
There can be up to 9 cap...
Finding the PHP File (at run time) where a Class was Defined
...lass
ReflectionClass::getFileName — Gets a filename
Example:
class Foo {}
$reflector = new \ReflectionClass('Foo');
echo $reflector->getFileName();
This will return false when the filename cannot be found, e.g. on native classes.
...
How do I use pagination with Django class based generic ListViews?
...<p>No cars found!!! :(</p>
{% endif %}
{# .... **More content, footer, etc.** .... #}
The page to display is indicated by a GET parameter, simply adding ?page=n, to the URL.
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jsonify a SQLAlchemy result set in Flask [duplicate]
... return [value.strftime("%Y-%m-%d"), value.strftime("%H:%M:%S")]
class Foo(db.Model):
# ... SQLAlchemy defs here..
def __init__(self, ...):
# self.foo = ...
pass
@property
def serialize(self):
"""Return object data in easily serializable format"""
ret...
Most efficient way to increment a Map value in Java
... = new ConcurrentHashMap<String, AtomicLong>();
map.putIfAbsent("foo", new AtomicLong(0));
map.get("foo").incrementAndGet();
will leave 1 as the value in the map for foo. Realistically, increased friendliness to threading is all that this approach has to recommend it.
...
Query EC2 tags from within instance
...mmand to get the "name" of the current instance, assuming you have a "Name=Foo" tag on it.
Assumes EC2_PRIVATE_KEY and EC2_CERT environment variables are set.
ec2-describe-tags \
--filter "resource-type=instance" \
--filter "resource-id=$(ec2-metadata -i | cut -d ' ' -f2)" \
--filter "key=Na...