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The Concept of 'Hold space' and 'Pattern space' in sed
...irst command is not executed; h copies the first line into the hold space.
now the second line replaces whatever was in the pattern space
on the second line, first we execute G, appending the contents of the hold buffer to the pattern buffer, separating it by a newline. The pattern space now contain...
An item with the same key has already been added
...
Would someone know how to identify which is "the same key?"
– ClayKaboom
Apr 15 '14 at 18:34
1
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How to remove the hash from window.location (URL) with JavaScript without page refresh?
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Solving this problem is much more within reach nowadays. The HTML5 History API allows us to manipulate the location bar to display any URL within the current domain.
function removeHash () {
history.pushState("", document.title, window.location.pathname
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Instagram how to get my user id from username?
....instagram.com/therock/?__a=1
Update i June-20-2019, the API is public now. No authentication required.
Update in December-11-2018, I needed to confirm that this endpoint still work. You need to login before sending request to this site because it's not public endpoint anymore. The login step i...
What's the best way of scraping data from a website? [closed]
...nd what data formats make up the responses.
You will need a good working knowledge of HTTP as well as HTML and will probably want to find a decent piece of man in the middle proxy software. You will need to be able to inspect HTTP requests and responses and understand how the cookies and session in...
Where can I find and submit bug reports on Google's Chrome browser?
... @JamesWilkins - Whoops, looks like the direct link had my (now expired) token. It should work correctly now.
– Pikamander2
Feb 23 '19 at 6:56
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Send and receive messages through NSNotificationCenter in Objective-C?
...w ios devs who keep the notification listener alive longer than they need. Now with arc you usually don't use dealloc and as a result some may think they don't have to release the listener.
– Vive
Nov 5 '13 at 7:45
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How to use PyCharm to debug Scrapy projects
...a good Python debugger. I want to test my Scrapy spiders using it. Anyone knows how to do that please?
10 Answers
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Rails create or update magic?
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Oh... I see what you meant now - that both forms, find_or_initialize_by and find_or_create_by accept a block. I thought you meant that whether the record exists or not, a block will be passed down with the record object as an argument, in order to do t...
Find object by id in an array of JavaScript objects
...urn e.id == id; });
The result is an array with the items found. If you know that the object is always there and that it only occurs once, you can just use result[0].foo to get the value. Otherwise you should check the length of the resulting array. Example:
if (result.length === 0) {
// no res...