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Validate that a string is a positive integer
...ng(n) === str && n >= 0;
}
or if you want to allow whitespace and leading zeros:
function isNormalInteger(str) {
str = str.trim();
if (!str) {
return false;
}
str = str.replace(/^0+/, "") || "0";
var n = Math.floor(Number(str));
return n !== Infinity &am...
Find which version of package is installed with pip
...
As of pip 1.3, there is a pip show command.
$ pip show Jinja2
---
Name: Jinja2
Version: 2.7.3
Location: /path/to/virtualenv/lib/python2.7/site-packages
Requires: markupsafe
In older versions, pip freeze and grep should do the job nicely.
$ pip freeze | grep Ji...
JavaScript DOM remove element
I'm trying to test if a DOM element exists, and if it does exist delete it, and if it doesn't exist create it.
5 Answers
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How can I get the diff between all the commits that occurred between two dates with Git?
... just for someone who stumbles upon this (as I did) Git help says: The command is kept primarily for historical reasons; fingers of many people who learned Git long before git log was invented by reading Linux kernel mailing list are trained to type it. So, the docs encourages using git log instead...
How to use SharedPreferences in Android to store, fetch and edit values [closed]
I want to store a time value and need to retrieve and edit it. How can I use SharedPreferences to do this?
31 Answers
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How to determine if a decimal/double is an integer?
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IMHO, the modulus operator and floating point numbers just don't mix in any way useful. The code suggested is incredibly confusing given the number of keystrokes used and will work almost nowhere outside of .NET languages. I would bet it's also much sl...
What are the differences between poll and select?
I am referring to the POSIX standard select and poll system C API calls.
3 Answers
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Java switch statement multiple cases
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@YuryLitvinov do you want to expand why you think it's incorrect?
– Bala R
May 14 '12 at 13:14
1
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What is the fastest integer division supporting division by zero no matter what the result is?
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Inspired by some of the comments I got rid of the branch on my Pentium and gcc compiler using
int f (int x, int y)
{
y += y == 0;
return x/y;
}
The compiler basically recognizes that it can use a condition flag of the test in the addition.
As per request the assembly:
.globl...
Why does string::compare return an int?
...eturn an int instead of a smaller type like short or char ? My understanding is that this method only returns -1, 0 or 1.
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