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How to get a key in a JavaScript object by its value?
...s[ prop ] === value )
return prop;
}
}
}
var test = {
key1: 42,
key2: 'foo'
};
test.getKeyByValue( 42 ); // returns 'key1'
One word of caution: Even if the above works, its generally a bad idea to extend any host or native object's .prototype. I did it here be...
How to determine an object's class?
...xception).
Possible ways summarized
Let's summarize the possible ways to test if an object obj is an instance of type C:
// Method #1
if (obj instanceof C)
;
// Method #2
if (C.class.isInstance(obj))
;
// Method #3
if (C.class.isAssignableFrom(obj.getClass()))
;
// Method #4
try {
...
Is there an onSelect event or equivalent for HTML ?
...u to use fiddle.jshell.net/ecmanaut/335XK/show/light directly for just-the-test, though - their editor view fails to load jQuery used in the example for readability. All above just tested with mouse interaction; to get this keyboard friendly this hack likely needs additional work, as at least old IE...
Making macOS Installer Packages which are Developer ID ready
...ponents.plist" \
--scripts "./Package/Scripts" \
--identifier "com.test.pkg.HelloWorld" \
--version "$VERSION" \
--install-location "/" \
"${BUILT_PRODUCTS_DIR}/HelloWorld.pkg"
pkgbuild --root "${BUILT_PRODUCTS_DIR}/Helper.app" \
--component-plist "./Package/HelperAppComponen...
How many spaces will Java String.trim() remove?
...
When in doubt, write a unit test:
@Test
public void trimRemoveAllBlanks(){
assertThat(" content ".trim(), is("content"));
}
NB: of course the test (for JUnit + Hamcrest) doesn't fail
...
How do I POST urlencoded form data with $http without jQuery?
...j[c])]); }, []).join('&');
– test30
Sep 14 '16 at 22:09
...
When should the xlsm or xlsb formats be used?
...er than .xlsb and saves 2 times longer and has 1.5 times a bigger file. I tested this on a generated worksheet with 10'000 rows * 1'000 columns = 10'000'000 (10^7) cells of simple chained =…+1 formulas:
╭──────────────╥────────┬──────...
Python string class like StringBuilder in C#?
... Note that this article was written based on Python 2.2. The tests would likely come out somewhat differently in a modern version of Python (CPython usually successfully optimizes concatenation, but you don't want to depend on this in important code) and a generator expression where he...
Python memoising/deferred lookup property decorator
...lf))
return getattr(self, attr_name)
return _lazyprop
class Test(object):
@lazyprop
def a(self):
print 'generating "a"'
return range(5)
Interactive session:
>>> t = Test()
>>> t.__dict__
{}
>>> t.a
generating "a"
[0, 1, 2, 3, 4]
&...
Checking if a blob exists in Azure Storage
...ust wrote a blog post to answer your question: http://blog.smarx.com/posts/testing-existence-of-a-windows-azure-blob.
The short answer is: use CloudBlob.FetchAttributes(), which does a HEAD request against the blob.
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