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How do I declare an array of weak references in Swift?
...eakObjectsHashTable. NSHashTable<ObjectType>.weakObjectsHashTable()
For Swift 3: NSHashTable<ObjectType>.weakObjects()
NSHashTable Class Reference
Available in OS X v10.5 and later.
Available in iOS 6.0 and later.
...
How to abandon a hg merge?
...mitted will be gone!
After that you should probably use some kind of code formatter tool to do the entire operation, or at least some find and replace with regular expressions. Something as simple as replacing what matches ^____ (use 4 spaces instead of underscores) with __ (2 spaces), repeated a f...
unit testing of private functions with mocha and node.js
I am using mocha in order to unit test an application written for node.js
9 Answers
9
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Truncating floats in Python
...
First, the function, for those who just want some copy-and-paste code:
def truncate(f, n):
'''Truncates/pads a float f to n decimal places without rounding'''
s = '{}'.format(f)
if 'e' in s or 'E' in s:
return '{0:.{1}f}'.for...
Python None comparison: should I use “is” or ==?
...r()
print thing == None #True
print thing is None #False
is checks for object identity. There is only 1 object None, so when you do my_var is None, you're checking whether they actually are the same object (not just equivalent objects)
In other words, == is a check for equivalence (which ...
Expand a random range from 1–5 to 1–7
...s is equivalent to Adam Rosenfield's solution, but may be a bit more clear for some readers. It assumes rand5() is a function that returns a statistically random integer in the range 1 through 5 inclusive.
int rand7()
{
int vals[5][5] = {
{ 1, 2, 3, 4, 5 },
{ 6, 7, 1, 2, 3 },
...
Best way to merge two maps and sum the values of same key?
...(1 -> 109, 3 -> 300, 2 -> 20)
Specifically, the binary operator for Map[K, V] combines the keys of the maps, folding V's semigroup operator over any duplicate values. The standard semigroup for Int uses the addition operator, so you get the sum of values for each duplicate key.
Edit: A ...
How do I convert a String object into a Hash object?
...to be evaluated as a hash by making sure that the above statement is valid for that string.
– Waseem
Nov 3 '09 at 14:38
1
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Why does calling a function in the Node.js REPL with )( work?
... which is ultimately as:
(hi)()
The additional parenthesis are added to force it to be an Expression:
// First we attempt to eval as expression with parens.
// This catches '{a : 1}' properly.
self.eval('(' + evalCmd + ')',
// ...
The intent is to treat {...} as Object literals/ini...
Troubleshooting “Illegal mix of collations” error in mysql
...The clause COLLATE allows you to specify the collation used in the query.
For example, the following WHERE clause will always give the error you posted:
WHERE 'A' COLLATE latin1_general_ci = 'A' COLLATE latin1_general_cs
Your solution is to specify a shared collation for the two columns within t...