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javascript check for not null
...lsey". The double-not operator !! will remove more than just null. It will convert NaN and undefined into false as well. And that's why your array filters correctly when using the double not-operator !!.
– tfmontague
Aug 6 '16 at 20:50
...
In Java, how do I call a base class's method from the overriding method in a derived class?
...
class test
{
void message()
{
System.out.println("super class");
}
}
class demo extends test
{
int z;
demo(int y)
{
super.message();
z=y;
System.out.println("re:"+z);
}
}
class free{
public static void main(String ar[])...
Java split() method strips empty strings at the end? [duplicate]
...er is an empty space character " " ? Eg: String s = "a "; public static int lengthOfLastWord(String s) { int l = 0; for(String eachWord : s.split("\\s+", -1)){ if(!eachWord.equals(" ")){ l = eachWord.length(); System.out.println("'" + eachWord + "'"); ...
“Parameter” vs “Argument” [duplicate]
...sion used when calling the method.
Consider the following code:
void Foo(int i, float f)
{
// Do things
}
void Bar()
{
int anInt = 1;
Foo(anInt, 2.0);
}
Here i and f are the parameters, and anInt and 2.0 are the arguments.
...
Create boolean column in MySQL with false as default value?
... mybool boolean not null default 0
);
FYI: boolean is an alias for tinyint(1).
Here is the proof:
mysql> create table mytable (
-> mybool boolean not null default 0
-> );
Query OK, 0 rows affected (0.35 sec)
mysql> insert into mytable () values ();
Query OK, 1...
How to initialize array to 0 in C?
... Please refer to: The initialized 0 is not a character. it is a integer.
– Yonggoo Noh
May 4 '16 at 4:43
...
Order a List (C#) by many fields? [duplicate]
...'t have to be IComparable
aListOfObjects.Sort((x, y) =>
{
int result = x.A.CompareTo(y.A);
return result != 0 ? result : x.B.CompareTo(y.B);
});
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What does `unsigned` in MySQL mean and when to use it?
...
MySQL says:
All integer types can have an optional
(nonstandard) attribute UNSIGNED.
Unsigned type can be used to permit
only nonnegative numbers in a column
or when you need a larger upper
numeric range for the column. For
examp...
Extract every nth element of a vector
...
It is better to use seq.int(1L, length(a), 6L), at least for long vectors
– Wojciech Sobala
Mar 8 '11 at 20:45
1
...
How to correctly sort a string with a number inside? [duplicate]
...ng (also known as natural sorting):
import re
def atoi(text):
return int(text) if text.isdigit() else text
def natural_keys(text):
'''
alist.sort(key=natural_keys) sorts in human order
http://nedbatchelder.com/blog/200712/human_sorting.html
(See Toothy's implementation in the ...