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Get the name of an object's type
...use the constructor property to test the type of the object like so:
var myArray = [1,2,3];
(myArray.constructor == Array); // true
So, that works well enough for most needs. That said...
Caveats
Will not work AT ALL in many cases
This pattern, though broken, is quite common:
function Thingy() {
}
...
Extract numbers from a string
...
How can I get my number in a simple variable and not in Array ?
– Bizboss
Jun 8 '11 at 12:15
36
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Run an OLS regression with Pandas Data Frame
...r suggestions: you can use sm.add_constant to add an intercept to the exog array and use a dict: reg = ols("y ~ x", data=dict(y=y,x=x)).fit()
– javadba
Jul 4 '17 at 22:38
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Big O, how do you calculate/approximate it?
... // 4
}
This function returns the sum of all the elements of the array, and we want to create a formula to count the computational complexity of that function:
Number_Of_Steps = f(N)
So we have f(N), a function to count the number of computational steps. The input of the function is the...
What's the cleanest way of applying map() to a dictionary in Swift?
...ng elements, grouping values (converting a collection into a dictionary of arrays, keyed by the result of mapping the collection over some function), and more.
During discussion of the proposal, SE-0165, that introduced these features, I brought up this Stack Overflow answer several times, and I th...
List of lists changes reflected across sublists unexpectedly
...;>> a
[5, 1, 1, 1]
P.S. Using numpy, if you only want to create an array of ones or zeroes you can use np.ones and np.zeros and/or for other number use np.repeat():
In [1]: import numpy as np
In [2]:
In [2]: np.ones(4)
Out[2]: array([ 1., 1., 1., 1.])
In [3]: np.ones((4, 2))
Out[3]: ...
Rails 3 check if attribute changed
...p; attrs).any?
then do something....
end
The changed method returns an array of the attributes changed for that object.
Both @user.changed and attrs are arrays so I can get the intersection (see ary & other ary method). The result of the intersection is an array. By calling any? on the arra...
How to parse a JSON string to an array using Jackson
...String, new TypeReference<List<SomeClass>>() { });
SomeClass[] array = mapper.readValue(jsonString, SomeClass[].class);
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Why does appending “” to a String save memory?
...string() gives a window onto an existing String - or rather, the character array underlying the original String. Hence it will consume the same memory as the original String. This can be advantageous in some circumstances, but problematic if you want to get a substring and dispose of the original St...
How can I create an array with key value pairs?
How can I add key value pairs to an array?
6 Answers
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