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HTML5 textarea placeholder not appearing
...layed since the input area contains content (a newline character is, technically, valid content).
Good:
<textarea></textarea>
Bad:
<textarea>
</textarea>
Update (2020)
This is not true anymore, according to the HTML5 parsing spec:
If the next token is a U+000A LINE FEED (LF...
Check whether an input string contains a number in javascript
My end goal is to validate an input field. The input may be either alphabetic or numeric.
12 Answers
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Preserving signatures of decorated functions
...
This is solved with Python's standard library functools and specifically functools.wraps function, which is designed to "update a wrapper function to look like the wrapped function". It's behaviour depends on Python version, however, as shown below. Applied to the example from the question, ...
How to use NSCache
...e to add a sharedInstance property. Just put the following code in a file called something like NSCache+Singleton.swift:
import Foundation
extension NSCache {
class var sharedInstance : NSCache {
struct Static {
static let instance : NSCache = NSCache()
}
r...
Why does Haskell's “do nothing” function, id, consume tons of memory?
Haskell has an identity function which returns the input unchanged. The definition is simple:
1 Answer
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The most sophisticated way for creating comma-separated Strings from a Collection/Array/List?
...ker With a reasonably modern compiler, StringBuilder might be used automatically. Check your environment before using += . See stackoverflow.com/questions/1532461/…
– gimel
Mar 15 '13 at 9:46
...
What are the differences between local branch, local tracking branch, remote branch and remote track
...your commits with other machines or locations. Each machine or location is called a remote, in Git's terminology, and each one may have one or more branches. Most often, you'll just have one, named origin. To list all the remotes, run git remote:
$ git remote
bitbucket
origin
You can see which lo...
Sort objects in an array alphabetically on one property of the array
... least remember the linting thing :)
– Michael Tranchida
May 18 '18 at 22:40
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Comparing mongoose _id and strings
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Mongoose uses the mongodb-native driver, which uses the custom ObjectID type. You can compare ObjectIDs with the .equals() method. With your example, results.userId.equals(AnotherMongoDocument._id). The ObjectID type also has a toString() method, if you wish to store a stringified version of t...
mysql :: insert into table, data from another table?
...
INSERT INTO action_2_members (campaign_id, mobile, vote, vote_date)
SELECT campaign_id, from_number, received_msg, date_received
FROM `received_txts`
WHERE `campaign_id` = '8'
share
...