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Is returning null bad design? [closed]
...) rather than null as it means my client code is cleaner; e.g.
Collection<? extends Item> c = getItems(); // Will never return null.
for (Item item : c) { // Will not enter the loop if c is empty.
// Process item.
}
... which is cleaner than:
Collection<? extends Item> c = getItem...
How to show current year in view?
...
<%= Time.current.year %>
http://pleac.sourceforge.net/pleac_ruby/datesandtimes.html
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“Cannot connect to iTunes Store” in-app purchases
... Your app does not have a bundle version (CFBundleVersion). <-- This is what saved me. Thanks for the link.
– daltonclaybrook
Feb 23 '17 at 15:33
add a commen...
Suppress Scientific Notation in Numpy When Creating Array From Nested List
...e to function set_printoptions works only for numbers that fit in the default 8 character space allotted to it, like this:
import numpy as np
np.set_printoptions(suppress=True) #prevent numpy exponential
#notation on print, default False
# tiny me...
Why is semicolon allowed in this python snippet?
...ments. Semi colons can be used to delimit statements if you wish to put multiple statements on the same line.
Now, why is this allowed? It's a simple design decision. I don't think Python needs this semi-colon thing, but somebody thought it would be nice to have and added it to the language.
...
What are the differences between double-dot “..” and triple-dot “…” in Git diff commit ranges?
...d these images, I thought it might be worth using them in another answer, although the description of the difference between .. (dot-dot) and ... (dot-dot-dot) is essentially the same as in manojlds's answer.
The command git diff typically¹ only shows you the difference between the states of the tr...
Swapping two variable value without using third variable
...atform.
Take for example this quick test program written in C.
#include <stdlib.h>
#include <math.h>
#define USE_XOR
void xorSwap(int* x, int *y){
if ( x != y ){
*x ^= *y;
*y ^= *x;
*x ^= *y;
}
}
void tempSwap(int* x, int* y){
int t;
t = *y;
...
Unable to create a constant value of type Only primitive types or enumeration types are supported in
...nother set of data that is in memory. You can try instead to extract the filtered items personProtocol of the ppCombined collection in memory after you have retrieved the other properties from the database:
var persons = db.Favorites
.Where(f => f.userId == userId)
.Join(db.Person, f =&g...
How do I sort an array of hashes by a value in the hash?
..._by, but use sort or sort! and simply flip the operands: a.sort! {|x,y| y <=> x } (ruby-doc.org/core-1.9.3/Array.html#method-i-sort)
– Stéphan Kochen
Oct 28 '12 at 10:39
1
...
PostgreSQL - max number of parameters in “IN” clause?
...ype available. If not, we fall back to a boolean
* condition tree with multiple copies of the lefthand expression.
* Also, any IN-list items that contain Vars are handled as separate
* boolean conditions, because that gives the planner more scope for
* optimization on such clauses.
*
* First ...