大约有 6,261 项符合查询结果（耗时：0.0160秒） [XML]
object==null or null==object?
...
This also closely relates to:
if ("foo".equals(bar)) {
which is convenient if you don't want to deal with NPEs:
if (bar!=null && bar.equals("foo")) {
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Traits vs. interfaces
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interface Person
{
public function greet();
public function eat($food);
}
trait EatingTrait
{
public function eat($food)
{
$this->putInMouth($food);
}
private function putInMouth($food)
{
// Digest delicious food
}
}
class NicePerson implements...
Checking a Python module version at runtime
... is quite simple to use:
from getversion import get_module_version
import foo
version, details = get_module_version(foo)
See the documentation for details.
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Plot two histograms on single chart with matplotlib
...ues returned by hist:
import numpy as np
import matplotlib.pyplot as plt
foo = np.random.normal(loc=1, size=100) # a normal distribution
bar = np.random.normal(loc=-1, size=10000) # a normal distribution
_, bins, _ = plt.hist(foo, bins=50, range=[-6, 6], normed=True)
_ = plt.hist(bar, bins=bins, ...
Strings are objects in Java, so why don't we use 'new' to create them?
... reference will point to the canonical String instance.
String a = "foo";
String b = "foo";
System.out.println(a == b); // true
String c = new String(a
What's the difference between isset() and array_key_exists()? [duplicate]
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@Zacky Japanese. And it just says 'foobar'.
– deceze♦
Jul 9 '10 at 12:03
18
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Unix shell script find out which directory the script file resides?
...sh, ksh:
#!/bin/bash
# Absolute path to this script, e.g. /home/user/bin/foo.sh
SCRIPT=$(readlink -f "$0")
# Absolute path this script is in, thus /home/user/bin
SCRIPTPATH=$(dirname "$SCRIPT")
echo $SCRIPTPATH
For tcsh, csh:
#!/bin/tcsh
# Absolute path to this script, e.g. /home/user/bin/foo.c...
What is the difference between JOIN and UNION?
...example of JOIN:
mysql> SELECT * FROM
-> (SELECT 23 AS bah) AS foo
-> JOIN
-> (SELECT 45 AS bah) AS bar
-> ON (33=33);
+-----+-----+
| foo | bar |
+-----+-----+
| 23 | 45 |
+-----+-----+
1 row in set (0.01 sec)
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Convert string to title case with JavaScript
...s my version, IMO it's easy to understand and elegant too.
var str = "foo bar baz"
console.log(
str.split(' ')
.map(w => w[0].toUpperCase() + w.substr(1).toLowerCase())
.join(' ')
)
// returns "Foo Bar Baz"
...
Are there strongly-typed collections in Objective-C?
...s in your generic ObjC class. If you specify constraints, e.g. MyClass <Foo: id<Bar>>, your Swift code will assume values are the type of your constraint, which gives you something to work with. However, specialized subclasses of MyClass would have their specialized types ignored (be se...