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Read first N lines of a file in python
... one won't work if the file doesn't have at least N lines. You are best to measure the performance against some typical data you will be using it with.
– John La Rooy
Nov 20 '09 at 0:47
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Why number 9 in kill -9 command in unix? [closed]
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Back in the day (by which I mean 4.xBSD or so) you couldn't use the mnemonics with the shell command, which is why the number 9 is written into an awful lot of old dusty-deck shell scripts.
– zwol
Mar 30 '12 at 23:...
Is there a method for String conversion to Title Case?
Are there any built in methods available to convert a string into Title Case format?
21 Answers
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Change Name of Import in Java, or import two classes with the same name
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There is no import aliasing mechanism in Java. You cannot import two classes with the same name and use both of them unqualified.
Import one class and use the fully qualified name for the other one, i.e.
import com.text.Formatter;
private Formatter t...
Are there pronounceable names for common Haskell operators? [closed]
...I never know how to pronounce the Haskell operators. Do they have "real" names? ?
5 Answers
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Ruby / Rails - Change the timezone of a Time, without changing the value
I have a record foo in the database which has :start_time and :timezone attributes.
11 Answers
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How do you use a variable in a regular expression?
I would like to create a String.replaceAll() method in JavaScript and I'm thinking that using a regex would be most terse way to do it. However, I can't figure out how to pass a variable in to a regex. I can do this already which will replace all the instances of "B" with "A" .
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Check if image exists on server using JavaScript?
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You could use something like:
function imageExists(image_url){
var http = new XMLHttpRequest();
http.open('HEAD', image_url, false);
http.send();
return http.status != 404;
}
Obviously you could use jQuery/similar to p...
Set a cookie to never expire
Looking at the php documentation on setting a cookie I see that I can set an expiration date for the cookie. You can set the cookie to expire at the end of the browser session or at some time in the future but I do not see a way to set the cookie to never expire. Is this even possible and how is...
How to set HTTP header to UTF-8 using PHP which is valid in W3C validator?
... when you set the HTTP header correctly like this, you do not need the <meta> tag at all anymore.
– Jon
Nov 25 '10 at 16:55
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