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How to generate a random integer number from within a range
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11 Answers
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Socket.IO - how do I get a list of connected sockets/clients?
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176
In Socket.IO 0.7 you have a clients method on the namespaces, this returns a array of all conn...
How to enumerate a range of numbers starting at 1
I am using Python 2.5, I want an enumeration like so (starting at 1 instead of 0):
12 Answers
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How to determine if a number is odd in JavaScript
... the below code:
function isOdd(num) { return num % 2;}
console.log("1 is " + isOdd(1));
console.log("2 is " + isOdd(2));
console.log("3 is " + isOdd(3));
console.log("4 is " + isOdd(4));
1 represents an odd number, while 0 represents an even number.
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Why does parseInt(1/0, 19) return 18?
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1294
The result of 1/0 is Infinity.
parseInt treats its first argument as a string which means fi...
Algorithm to calculate the number of divisors of a given number
...ivisor is repeated)
then the total count for all of the divisors is:
(x + 1) * (y + 1) * (z + 1).
Edit: BTW, to find a,b,c,etc you'll want to do what amounts to a greedy algo if I'm understanding this correctly. Start with your largest prime divisor and multiply it by itself until a further multip...
Regular expression for matching HH:MM time format
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19 Answers
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How do I pick randomly from an array?
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1140
Just use Array#sample:
[:foo, :bar].sample # => :foo, or :bar :-)
It is available in Ru...
Extract first item of each sublist
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Using list comprehension:
>>> lst = [['a','b','c'], [1,2,3], ['x','y','z']]
>>&g...
Modular multiplicative inverse function in Python
...e inverse of a number, i.e. a number y = invmod(x, p) such that x*y == 1 (mod p) ? Google doesn't seem to give any good hints on this.
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