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Dynamically Changing log4j log level
...he documentation of org.apache.log4j.xml.DOMConfigurator.configureAndWatch(String,long) for details. The default wait time between checks is 60 seconds. These changes would be persistent, since you directly change the configuration file on the filesystem. All you need to do is to invoke DOMConfigura...
When saving, how can you check if a field has changed?
...
Really perfect, and do not perform extra query. Thanks a lot !
– Stéphane
Mar 4 '13 at 10:26
29
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How do you represent a JSON array of strings?
...nts are always ignored by any JSON parser.
And value is an object, array, string, number, bool or null:
So yeah, ["a", "b"] is a perfectly valid JSON, like you could try on the link Manish pointed.
Here are a few extra valid JSON examples, one per block:
{}
[0]
{"__comment": "json doesn't accept...
Referencing another schema in Mongoose
...small change to your post schema:
var postSchema = new Schema({
name: String,
postedBy: {type: mongoose.Schema.Types.ObjectId, ref: 'User'},
dateCreated: Date,
comments: [{body:"string", by: mongoose.Schema.Types.ObjectId}],
});
Then make your model:
var Post = mongoose.model('Po...
How to modify a text file?
I'm using Python, and would like to insert a string into a text file without deleting or copying the file. How can I do that?
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Fastest way to check if a string is JSON in PHP?
I need a really, really fast method of checking if a string is JSON or not. I feel like this is not the best way:
30 Answer...
find() with nil when there are no records
...ou already have a block such as a controller method. In that case the only extra line you need is the rescue line. Much more elegant and easier to handle than checking for nil with an if statement.
– morgler
Aug 1 '17 at 7:30
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Javascript parseInt() with leading zeros
...cond argument:
parseInt("08", 10);
Earlier versions of JavaScript treat strings starting with 0 as octal (when no base is specified) and neither 08 nor 09 are valid octal numbers.
From the Mozilla documentation:
If radix is undefined or 0, JavaScript assumes the following:
If the in...
How to check whether a given string is valid JSON in Java
How do I validate a JSON string in Java? Or could I parse it using regular expressions?
19 Answers
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What does asterisk * mean in Python? [duplicate]
...=%s" % (args,)
argdict = dict(a="testa", b="testb", c="testc", excessarg="string")
foo(**argdict)
Prints:
a=testa
b=testb
c=testc
args={'excessarg': 'string'}
And
def foo(a,b,c,*args):
print "a=%s" % (a,)
print "b=%s" % (b,)
print "c=%s" % (c,)
print "args=%s" % (args,)
argtu...