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What is the significance of initializing direction arrays below with given values when developing ch
...it to a nearby location, 1,0 is east, -1,0 is west, 0,1 is south, 0,-1 is north and so on.
(Here I have said top left is 0,0 and bottom right is 4,4 and shown what move each index of the arrays will make from the central point, X, at 2,2.)
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.536.
.1X0.
.724.
.....
The way it is set up, if y...
Java HashMap performance optimization / alternative
I want to create a large HashMap but the put() performance is not good enough. Any ideas?
25 Answers
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Disable browser's back button
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This question is very similar to this one...
You need to force the cache to expire for this to work. Place the following code on your page code behind.
Page.Response.Cache.SetCacheability(HttpCacheability.NoCache)
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Java rounding up to an int using Math.ceil
...gers with each other, which always result in a rounded down integer. Therefore the (int) Math.ceil(...) isn't doing anything. There are three possible solutions to achieve what you want. I recommend using either option 1 or option 2. Please do NOT use option 0.
##Option 0
Convert a and b to a double...
Is there a faster/shorter way to initialize variables in a Rust struct?
... the fields. Alternatively, it effectively takes one additional statement for each field to assign a value to the fields. All I want to be able to do is to assign default values when the struct is instantiated.
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Difference between final and effectively final
...warning local variables referenced from a lambda expression must be final or effectively final . I know that when I use variables inside anonymous class they must be final in outer class, but still - what is the difference between final and effectively final ?
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How to use RSpec's should_raise with any kind of exception?
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expect { some_method }.to raise_error
RSpec 1 Syntax:
lambda { some_method }.should raise_error
See the documentation (for RSpec 1 syntax) and RSpec 2 documentation for more.
shar...
Get the real width and height of an image with JavaScript? (in Safari/Chrome)
... elem
var pic_real_width, pic_real_height;
$("<img/>") // Make in memory copy of image to avoid css issues
.attr("src", $(img).attr("src"))
.load(function() {
pic_real_width = this.width; // Note: $(this).width() will not
pic_real_height = this.height; // work for in ...
TypeError: 'dict_keys' object does not support indexing
When I run the shuffle function it raises the following error, why is that?
5 Answers
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How can I multiply all items in a list together with Python?
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Python 3: use functools.reduce:
>>> from functools import reduce
>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
720
Python 2: use reduce:
>>> reduce(lambda x, y: x*y, [1,2,3,4,5,6])
720
For compatible with 2 and 3 use pip install six, then:
>>> from...