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Are lists thread-safe?
...to concurrently access, the lists's data is not protected. For example:
L[0] += 1
is not guaranteed to actually increase L[0] by one if another thread does the same thing, because += is not an atomic operation. (Very, very few operations in Python are actually atomic, because most of them can cau...
How to check if PHP array is associative or sequential?
...w to determine whether an array has sequential numeric keys, starting from 0
Consider which of these behaviours you actually need. (It may be that either will do for your purposes.)
The first question (simply checking that all keys are numeric) is answered well by Captain kurO.
For the second qu...
What is the difference between Gemfile and Gemfile.lock in Ruby on Rails
I am a beginner to Ruby on Rails and I am using Rails 3.0.9.
3 Answers
3
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iPad Safari scrolling causes HTML elements to disappear and reappear with a delay
...ou can do this with an empty 3d transform:
-webkit-transform: translate3d(0,0,0)
Particularly, you'll need this on child elements that have a position:relative; declaration (or, just go all out and do it to all child elements).
Not a guaranteed fix, but fairly successful most of the time.
Hat t...
How to trim white spaces of array values in php
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edited Sep 20 '19 at 8:55
Sebastian Viereck
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answ...
How do you find the sum of all the numbers in an array in Java?
...
In java-8 you can use streams:
int[] a = {10,20,30,40,50};
int sum = IntStream.of(a).sum();
System.out.println("The sum is " + sum);
Output:
The sum is 150.
It's in the package java.util.stream
import java.util.stream.*;
...
Can't use modulus on doubles?
...
280
The % operator is for integers. You're looking for the fmod() function.
#include <cmath>...
How to trace the path in a Breadth-First Search?
...
+50
You should have look at http://en.wikipedia.org/wiki/Breadth-first_search first.
Below is a quick implementation, in which I used ...
Random row selection in Pandas dataframe
...me(x, n):
return x.ix[random.sample(x.index, n)]
Note: As of Pandas v0.20.0, ix has been deprecated in favour of loc for label based indexing.
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