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How to detect if a variable is an array
...efore, it might be a good idea to check if the object has a property named 0 instead, which can be done via one of these checks:
typeof obj[0] !== 'undefined' // false negative for `obj[0] = undefined`
obj.hasOwnProperty('0') // exclude array-likes with inherited entries
'0' in Object(obj) // inclu...
What's the difference between returning void and returning a Task?
...ippert
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What are the differences between double-dot “..” and triple-dot “…” in Git commit ranges?
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answered Jan 20 '09 at 20:46
PieterPieter
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What is the benefit of zerofill in MySQL?
..., 123456789);
SELECT x, y FROM yourtable;
Result:
x y
00000001 1
00000012 12
00000123 123
123456789 123456789
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How to select lines between two marker patterns which may occur multiple times with awk/sed
... to trigger the print when necessary:
$ awk '/abc/{flag=1;next}/mno/{flag=0}flag' file
def1
ghi1
jkl1
def2
ghi2
jkl2
How does this work?
/abc/ matches lines having this text, as well as /mno/ does.
/abc/{flag=1;next} sets the flag when the text abc is found. Then, it skips the line.
/mno/{f...
What happens to a declared, uninitialized variable in C? Does it have a value?
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10 Answers
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How to make Git pull use rebase by default for all my repositories?
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edited Oct 18 '18 at 18:30
answered Dec 20 '12 at 14:45
Pa...
Execution failed app:processDebugResources Android Studio
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108
For me it helped to change the version of buildTools to:
buildToolsVersion "21.0.1"
You will...
Assert an object is a specific type
...tanceOf;
import static org.junit.Assert.assertThat;
/**
* @author maba, 2012-09-13
*/
public class InstanceOfTest {
@Test
public void testInstanceOf() {
SubClass subClass = new SubClass();
assertThat(subClass, instanceOf(BaseClass.class));
}
}
...
How to compare DateTime in C#?
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MSDN: DateTime.Compare
DateTime date1 = new DateTime(2009, 8, 1, 0, 0, 0);
DateTime date2 = new DateTime(2009, 8, 1, 12, 0, 0);
int result = DateTime.Compare(date1, date2);
string relationship;
if (result < 0)
relationship = "is earlier than";
else if (result == 0)
rel...