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How do you check if a variable is an array in JavaScript? [duplicate]
...n.
variable.constructor === Array
This is the fastest method on Chrome, and most likely all other browsers. All arrays are objects, so checking the constructor property is a fast process for JavaScript engines.
If you are having issues with finding out if an objects property is an array, you mus...
Finding row index containing maximum value using R
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@bartektartanus And how do you suppose which.max figures out the max? :p
– Nick Ulle
Nov 29 '14 at 23:30
10
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Physical vs. logical / soft delete of database record?
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Advantages are that you keep the history (good for auditing) and you don't have to worry about cascading a delete through various other tables in the database that reference the row you are deleting. Disadvantage is that you have to code any reporting/display methods to take the flag ...
Is it possible for a computer to “learn” a regular expression by user-provided examples?
...ton, it is possible to learn some regular expressions by a program. Kearns and Valiant show some cases where it is not possible to learn a finite automaton. A related problem is learning hidden Markov Models, which are probabilistic automata that can describe a character sequence. Note that most mod...
submitting a GET form with query string params and hidden params disappear
...RFC1866, page 46; HTML 4.x section 17.13.3) state:
If the method is "get" and the action is an HTTP URI, the user agent takes the value of action, appends a `?' to it, then appends the form data set, encoded using the "application/x-www-form-urlencoded" content type.
Maybe one could percent-encode...
Is there a python equivalent of Ruby's 'rvm'?
...dle a specific Python install (say, 2.7) with certain eggs in one project, and with certain other eggs in another? RVM manages all this stuff seamlessly, and sudo is a thing of the past.
– Kyle Wild
Apr 5 '11 at 15:56
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Is there a way to keep Hudson / Jenkins configuration files in source control?
I am new to Hudson / Jenkins and was wondering if there is a way to check in Hudson's configuration files to source control.
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From Arraylist to Array
... zero-length array is created, then the real-size array is created, filled and returned. So, if since you know the needed size (from list.size()) you should create array that is big enough to put all elements. In this case it is not re-allocated.
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Changing iframe src with Javascript
...ne clicks a radio button. For some reason my code is not working correctly and I am having trouble figuring out why. Here is what I have:
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How do you create different variable names while in a loop? [duplicate]
...a, but...
for x in range(0, 9):
globals()['string%s' % x] = 'Hello'
and then for example:
print(string3)
will give you:
Hello
However this is bad practice. You should use dictionaries or lists instead, as others propose. Unless, of course, you really wanted to know how to do it, but d...