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Python: fastest way to create a list of n lists
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The probably only way which is marginally faster than
d = [[] for x in xrange(n)]
is
from itertools import repeat
d = [[] for i in repeat(None, n)]
It does not have to create a new int object in every iteration and is about 15 % faster on my machine.
Edit: Using NumPy, you can avo...
How to get object length [duplicate]
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For browsers supporting Object.keys() you can simply do:
Object.keys(a).length;
Otherwise (notably in IE < 9), you can loop through the object yourself with a for (x in y) loop:
var count = 0;
var i;
for (i in a) {
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Cartesian product of x and y array points into single array of 2D points
I have two numpy arrays that define the x and y axes of a grid. For example:
13 Answers
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Rails 3 execute custom sql query without a model
...urns the actual results - what I want, while execute just returns status information.
– Paul Chernoch
Jun 9 '16 at 17:23
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Passing an integer by reference in Python
... in the same sense as you have in C. (They don't have to be dereferenced, for example). In my mental model, it's easier to think of things as "Names" and "Objects". Assignment binds a "Name"(s) on the left to an "Object"(s) on the right. When you call a function, you pass the "Object" (effective...
What is the best way to trigger onchange event in react js
...lues directly to the model via own wrapper that supports ReactJS interface for two way binding.
11 Answers
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Backup/Restore a dockerized PostgreSQL database
... answered Apr 28 '15 at 7:50
ForthForth
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Java Reflection: How to get the name of a variable?
...sing Java Reflection, is it possible to get the name of a local variable? For example, if I have this:
8 Answers
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How do I clear only a few specific objects from the workspace?
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For deleting all variables you can use rm(list=ls()).
– larkee
Oct 21 '14 at 22:23
1
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“Unknown provider: aProvider
...nction SomeController( $scope, i18n ) { /* ... */ }
This works just fine for AngularJS, but to make it work right with mangling, I had to change it to:
var applicationModule = angular.module( "example" );
function SomeController( $scope, i18n ) { /* ... */ }
applicationModule.controller( "SomeCon...