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Is there a standard function to check for null, undefined, or blank variables in JavaScript?
... ) {
}
will evaluate to true if value is not:
null
undefined
NaN
empty string ("")
0
false
The above list represents all possible falsy values in ECMA-/Javascript. Find it in the specification at the ToBoolean section.
Furthermore, if you do not know whether a variable exists (that means, if ...
How do I get python's pprint to return a string instead of printing?
... the documentation:
Return the formatted representation of object as a string. indent,
width and depth will be passed to the PrettyPrinter constructor as
formatting parameters.
Example:
>>> import pprint
>>> people = [
... {"first": "Brian", "last": "Kernighan"},
.....
java.lang.OutOfMemoryError: GC overhead limit exceeded [duplicate]
... of thousands) HashMap objects with a few (15-20) text entries each. These Strings have all to be collected (without breaking up into smaller amounts) before being submitted to a database.
...
What's the reason I can't create generic array types in Java?
... the code generated by new ArrayList<SomeType>() or new ArrayList<String>() or new ArrayList() at all.
– newacct
Mar 26 '14 at 0:05
8
...
What is the difference between partitioning and bucketing a table in Hive ?
...t . For a faster query response Hive table can be PARTITIONED BY (country STRING, DEPT STRING). Partitioning tables changes how Hive structures the data storage and Hive will now create subdirectories reflecting the partitioning structure like
.../employees/country=ABC/DEPT=XYZ.
If query limits f...
What is the shortest way to pretty print a org.w3c.dom.Document to stdout?
...
Try jcabi-xml with one liner:
String xml = new XMLDocument(document).toString();
This is the dependency you need:
<dependency>
<groupId>com.jcabi</groupId>
<artifactId>jcabi-xml</artifactId>
<version>0.14</v...
Replacing .NET WebBrowser control with a better browser, like Chrome?
...11001
}
public static class WBEmulator
{
private const string InternetExplorerRootKey = @"Software\Microsoft\Internet Explorer";
public static int GetInternetExplorerMajorVersion()
{
int result;
result = 0;
try
{
...
How to create a simple map using JavaScript/JQuery [duplicate]
...
The keys shouldn't be specified as strings, i.e. without quotes
– lilalinux
Sep 24 '15 at 15:12
add a comment
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...
machine learning libraries in C# [closed]
...2 helper classes:
public class TrainingSet
{
private readonly List<string> _attributes = new List<string>();
private readonly List<List<object>> _examples = new List<List<object>>();
public TrainingSet(params string[] attributes)
{
_attribu...
GetType() can lie?
...ceFoo();
Console.WriteLine("BadFoo says he's a '{0}'", badFoo.GetType().ToString());
Console.WriteLine("NiceFoo says he's a '{0}'", niceFoo.GetType().ToString());
Console.WriteLine("BadFoo really is a '{0}'", typeof(BadFoo));
Console.WriteLine("NiceFoo really is a '{0}'", typeof(NiceFoo));
Console...