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How do I check for null values in JavaScript?
... will check for empty strings (""), null, undefined, false and the numbers 0 and NaN
Please note that if you are specifically checking for numbers it is a common mistake to miss 0 with this method, and num !== 0 is preferred (or num !== -1 or ~num (hacky code that also checks against -1)) for funct...
Concatenating string and integer in python
...
answered Jul 19 '12 at 10:43
user647772user647772
...
How to count items in a Go map?
...ed from the now-retired SO documentation:
m := map[string]int{}
len(m) // 0
m["foo"] = 1
len(m) // 1
If a variable points to a nil map, then len returns 0.
var m map[string]int
len(m) // 0
Excerpted from Maps - Counting map elements. The original author was Simone Carletti. Attribution det...
Matplotlib plots: removing axis, legends and white spaces
...
406
I think that the command axis('off') takes care of one of the problems more succinctly than cha...
Deleting lines from one file which are in another file
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answered Jan 24 '11 at 9:06
gabuzogabuzo
6,27833 gold badges2323 silver badges3535 bronze badges
...
Equivalent of varchar(max) in MySQL?
...the table.
mysql> CREATE TABLE foo ( v VARCHAR(65534) );
ERROR 1118 (42000): Row size too large. The maximum row size for the used table type, not counting BLOBs, is 65535. This includes storage overhead, check the manual. You have to change some columns to TEXT or BLOBs
But if we try decreasi...
Which, if any, C++ compilers do tail-recursion optimization?
...s such as:
int bar(int, int);
int foo(int n, int acc) {
return (n == 0) ? acc : bar(n - 1, acc + 2);
}
int bar(int n, int acc) {
return (n == 0) ? acc : foo(n - 1, acc + 1);
}
Letting the compiler do the optimisation is straightforward: Just switch on optimisation for speed:
For MSVC,...
What is the Bash equivalent of Python's pass statement
...
answered Mar 10 '10 at 23:55
Ignacio Vazquez-AbramsIgnacio Vazquez-Abrams
668k127127 gold badges11911191 silver badges12501250 bronze badges
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Why use softmax as opposed to standard normalization?
...
170
There is one nice attribute of Softmax as compared with standard normalisation.
It react to lo...
Append a NumPy array to a NumPy array
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answered Mar 19 '12 at 18:01
endolithendolith
19.6k2424 gold badges107107 silver badges170170 bronze badges
...