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round() for float in C++
...tter, lrint to use the current rounding mode instead of round's funky away-from-zero tiebreak.
– Peter Cordes
Nov 17 '17 at 3:41
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What is the purpose of the var keyword and when should I use it (or omit it)?
...tion()
{
var wibble = 1; // Local
foo = 2; // Inherits from scope above (creating a closure)
moo = 3; // Global
}())
}
If you're not doing an assignment then you need to use var:
var x; // Declare x
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When and why I should use session_regenerate_id()?
...regenerate_id() in order to stop session hijacking and session fixation.
From this Security.SE answer:
Session hijacking refers to stealing the session cookie. This can be most easily accomplished when sharing a local network with other computers. E.g. at Starbucks. Example... a user with sess...
Algorithm to generate all possible permutations of a list?
...
Basically, for each item from left to right, all the permutations of the remaining items are generated (and each one is added with the current elements). This can be done recursively (or iteratively if you like pain) until the last item is reached at...
Read environment variables in Node.js
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When using Node.js, you can retrieve environment variables by key from the process.env object:
for example
var mode = process.env.NODE_ENV;
var apiKey = process.env.apiKey; // '42348901293989849243'
Here is the answer that will explain setting environment variables in node.js
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How to return a part of an array in Ruby?
...turns a subarray specified by range. Negative indices count
backward from the end of the array (-1 is the last element).
Returns nil if the index (or starting index) are out of range.
a = [ "a", "b", "c", "d", "e" ]
a[2] + a[0] + a[1] #=> "cab"
a[6] ...
How to correctly require a specific commit in Composer so that it would be available for dependent p
I have a library foo/foo-lib which requires a specific commit from GitHub:
3 Answers
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Change a Django form field to a hidden field
...oes without saying, but you'll need to import forms before this will work. from django import forms
– teewuane
Jul 30 '14 at 22:18
2
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Practicing BDD with python [closed]
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If you are using django, save yourself some time from using Lettuce, the current version 2.19 doesn't work with latest django.
– James Lin
May 6 '14 at 3:10
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Count the number occurrences of a character in a string
...lest, but if you're doing this frequently, check out collections.Counter:
from collections import Counter
my_str = "Mary had a little lamb"
counter = Counter(my_str)
print counter['a']
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