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How to generate unique ID with node.js
How to set a variable value with database query callback? How I can do it?
13 Answers
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Does Android keep the .apk files? if so where?
After android installs an application from the Marketplace, does it keep the .apk file?
19 Answers
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What is the difference between class and instance attributes?
... a.foo.append(5)
>>> b.foo
[5]
>>> class A:
... def __init__(self): self.foo = []
>>> a, b = A(), A()
>>> a.foo.append(5)
>>> b.foo
[]
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Android Spanned, SpannedString, Spannable, SpannableString and CharSequence
...on of CharSequence, followed by StringBuilder.
Spanned is a CharSequence with "spans" indicating formatting to apply to portions of the text, where those spans cannot be modified.
Spannable is a Spanned, adding in the ability to modify the spans (to add or remove formatting), but not to modify the...
C# pattern to prevent an event handler hooked twice [duplicate]
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Explicitly implement the event and check the invocation list. You'll also need to check for null:
using System.Linq; // Required for the .Contains call below:
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private EventHandler foo;
public event EventHandler Foo
{
add...
What is the string length of a GUID?
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It depends on how you format the Guid:
Guid.NewGuid().ToString() => 36 characters (Hyphenated)
outputs: 12345678-1234-1234-1234-123456789abc
Guid.NewGuid().ToString("D") => 36 characters (Hyphenated, same as ToString...
jQuery Validate - require at least one field in a group to be filled
...up of fields. I think I've got a pretty good solution, and wanted to share it. Please suggest any improvements you can think of.
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Is it possible to specify the schema when connecting to postgres with JDBC?
Is it possible? Can i specify it on the connection URL? How to do that?
9 Answers
9
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(Built-in) way in JavaScript to check if a string is a valid number
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To check if a variable (including a string) is a number, check if it is not a number:
This works regardless of whether the variable content is a string or number.
isNaN(num) // returns true if the variable does NOT contain a valid number
Examples
isNaN(123) // false
isN...
What does f+++++++++ mean in rsync logs?
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1 - A huge advantage of rsync is that after an interruption the next time it continues smoothly.
The next rsync invocation will not transfer the files again, that it had already transferred, if they were not changed in the meantime. But it will start checking all the files again from the beginning...