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Calling Java varargs method with single null argument?
...le. See the example below:
public class Temp{
public static void main(String[] args){
foo("a", "b", "c");
foo(null, null);
foo((Object)null);
Object bar = null;
foo(bar);
}
private static void foo(Object...args) {
System.out.println("foo called, args: ...
Replacing blank values (white space) with NaN in pandas
...^\s*$' should be the expression to use. without ^ and $ it will match any string with two consecutive blanks. Also changed + to * to include the empty string "" in the list of things to convert to NaN
– Master Yogurt
Nov 18 '16 at 17:36
...
What is a NullReferenceException, and how do I fix it?
...ess members (such as methods) through a null reference. The simplest case:
string foo = null;
foo.ToUpper();
This will throw a NullReferenceException at the second line because you can't call the instance method ToUpper() on a string reference pointing to null.
Debugging
How do you find the source ...
jQuery: checking if the value of a field is null (empty)
...
The value of a field can not be null, it's always a string value.
The code will check if the string value is the string "NULL". You want to check if it's an empty string instead:
if ($('#person_data[document_type]').val() != ''){}
or:
if ($('#person_data[document_type]')....
Why is isNaN(null) == false in JS?
...ing Number(null) and see that it returns 0,) and isNaN(0) returns false. A string that is only digits can be converted to a number and isNaN also returns false. A string (e.g. 'abcd') that cannot be converted to a number will cause isNaN('abcd') to return true, specifically because Number('abcd') re...
How can I check if a string represents an int, without using try/except?
Is there any way to tell whether a string represents an integer (e.g., '3' , '-17' but not '3.14' or 'asfasfas' ) Without using a try/except mechanism?
...
New line in text area
...
I've found String.fromCharCode(13, 10) helpful when using view engines.
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/fromCharCode
This creates a string with the actual newline characters in i...
Cast Object to Generic Type for returning
...ssCastException e) {
return null;
}
}
public static void main(String[] args) {
String k = convertInstanceOfObject(345435.34);
System.out.println(k);
}
and the corresponding byte code is:
public static <T> T convertInstanceOfObject(java.lang.Object);
Code:
0: ...
Operator Overloading with C# Extension Methods
...attempting to use extension methods to add an operater overload to the C# StringBuilder class. Specifically, given StringBuilder sb , I'd like sb += "text" to become equivalent to sb.Append("text") .
...
Using Selenium Web Driver to retrieve value of a HTML input
...like that :
WebElement element = driver.findElement(By.id("input_name"));
String elementval = element.getAttribute("value");
OR
String elementval = driver.findElement(By.id("input_name")).getAttribute("value");
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