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Check whether variable is number or string in JavaScript
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Best way to do that is using isNaN + type casting:
Updated all-in method:
function isNumber(n) { return !isNaN(parseFloat(n)) && !isNaN(n - 0) }
The same using regex:
function isNumber(n) { return /^-?[\d.]+(?:e-?\d+)?$/.test(n); }
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How can I validate a string to only allow alphanumeric characters in it?
...an get fancier and implement all of the equality operators, or an explicit cast to AlphaNumericString from plain ol' string, if you care.
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java.util.Date to XMLGregorianCalendar
...in(final String[] args) throws Exception {
// do not forget the type cast :/
GregorianCalendar gcal = (GregorianCalendar) GregorianCalendar.getInstance();
XMLGregorianCalendar xgcal = DatatypeFactory.newInstance()
.newXMLGregorianCalendar(gcal);
System.out.println...
Is there a way to suppress warnings in Xcode?
...warning in your code can be avoided by doing things correctly (normally by casting objects to the correct type) or by declaring prototypes when you need them.
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How to avoid scientific notation for large numbers in JavaScript?
...the first one is a formatted string and the second one is a Number. If you cast the first one to a Number, you will see that they are absolutely equal: jsfiddle.net/qd6hpnyx/1. You can take your downvote back :P
– VisioN
Jan 18 '17 at 22:50
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How do I create an empty array/matrix in NumPy?
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# Initialize your variable as an empty list first
In [32]: x=[]
# and now cast it as a numpy ndarray
In [33]: x=np.array(x)
The result will be:
In [34]: x
Out[34]: array([], dtype=float64)
Therefore you can directly initialize an np array as follows:
In [36]: x= np.array([], dtype=np.float64)...
Can table columns with a Foreign Key be NULL?
... a little bit to remember what needs to be done.
If the data submitted is cast or interpreted as an empty string, it will fail. However, by explicitly setting the value to NULL when INSERTING or UPDATING, you're good to go.
But this is the fun of programming, isn't it? Creating our own problems a...
How to configure heroku application DNS to Godaddy Domain?
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I used this videocast to set up my GoDaddy domain with Heroku, and it worked perfectly. Very clear and well explained.
Note: Skip the part about CNAME yourdomain.com. (note the .) and the heroku addons:add "custom domains"
http://blog.herok...
How can I turn a List of Lists into a List in Java 8?
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If you need to do explicit casting (array of primitives to List for example) then lambdas may be necessary as well.
– Michael Fulton
May 28 '17 at 3:58
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What does %s mean in a python format string?
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nice. %d saves you from casting str(int). any idea what the %s and %d stand for? i guess i'll remember them as string and digit.
– user391339
Apr 3 '16 at 19:29
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