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How do I convert a string to a number in PHP?
... // 34
echo intval(array()); // 0
echo intval(array('foo', 'bar')); // 1
?>
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Ways to implement data versioning in MongoDB
...ions:
{
_id: ObjectId("..."),
data: [
{ vid: 1, content: "foo" },
{ vid: 2, content: "bar" }
]
}
data contains all versions. The data array is ordered, new versions will only get $pushed to the end of the array. data.vid is the version id, which is an incrementing numb...
how to POST/Submit an Input Checkbox that is disabled?
... specifically set the value of readonly to readonly, i.e.: <input name="foo" value="bar" readonly="readonly" />
– Matt Huggins
Jan 18 '11 at 19:20
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AWS S3: how do I see how much disk space is using
...separated by \ for easy reading here):
aws s3 ls s3://<bucket_name>/foo/bar | \
grep -v -E "(Bucket: |Prefix: |LastWriteTime|^$|--)" | \
awk 'BEGIN {total=0}{total+=$3}END{print total/1024/1024" MB"}'
the aws part lists the bucket (or optionally a 'sub-folder')
the grep part removes (using...
How do getters and setters work?
... only thing that makes them getters or setters is convention. A getter for foo is called getFoo and the setter is called setFoo. In the case of a boolean, the getter is called isFoo. They also must have a specific declaration as shown in this example of a getter and setter for 'name':
class Dummy
{...
Why is the shovel operator (
...
Proof:
a = 'foo'
a.object_id #=> 2154889340
a << 'bar'
a.object_id #=> 2154889340
a += 'quux'
a.object_id #=> 2154742560
So << alters the original string rather than creating a new one. The reason for this is that ...
Create singleton using GCD's dispatch_once in Objective-C
...ere can only ever be 1 of these objects), but as long as you only use the [Foo sharedFoo] method to access the object, this is good enough.
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Convert JavaScript String to be all lower case?
.... The old string will remain unchanged.
So, you can do something like:
"Foo".toLowerCase();
document.getElementById('myField').value.toLowerCase();
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Query an XDocument for elements by name at any depth
...
@DrorHarari Nope, no exception is thrown: Try out var foo = new XDocument().Descendants("Bar").Descendants("Baz"); Because Descendants returns an empty IEnumerable<XElement>and not null.
– DareDude
Jul 24 '16 at 17:24
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ValueError : I/O operation on closed file
...
Same error can raise by mixing: tabs + spaces.
with open('/foo', 'w') as f:
(spaces OR tab) print f <-- success
(spaces AND tab) print f <-- fail
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