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html5 - canvas element - Multiple layers
...st layer on the layer1 canvas, and the second layer on the layer2 canvas. Then when you clearRect on the top layer, whatever's on the lower canvas will show through.
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CSS: Animation vs. Transition
...e, or you need more fine grain control over the keyframes in a transition, then you've got to use an animation.
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Efficiency of premature return in a function
...ed.
If the simple example above is extended with resource allocation, and then error checking with a potential resulting freeing of resources, the picture might change.
Consider the naive approach beginners might take:
int func(..some parameters...) {
res_a a = allocate_resource_a();
if (!a) ...
Easy interview question got harder: given numbers 1..100, find the missing number(s) given exactly k
...mming both the numbers themselves, and the squares of the numbers.
We can then reduce the problem to
k1 + k2 = x
k1^2 + k2^2 = y
Where x and y are how far the sums are below the expected values.
Substituting gives us:
(x-k2)^2 + k2^2 = y
Which we can then solve to determine our missing numbe...
Length of an integer in Python
...0 can be used to find the magnitude of a number. Wish I could up-vote more then once :).
– Abbas
Dec 20 '10 at 18:10
15
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Facebook Android Generate Key Hash
... something like %USERHOME%/.android on Windows.
The Eclipse plugin should then generate a new certificate when you next try to build a debug package.
Let me know if that works.
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Java int to String - Integer.toString(i) vs new Integer(i).toString()
... Integer, which is a full Java object encapsulating the value of your int. Then you call the toString method on it to ask it to return a string representation of itself.
If all you want is to print an int, you'd use the first one because it's lighter, faster and doesn't use extra memory (aside from...
How to stop tracking and ignore changes to a file in Git?
... a password embedded in a config file. I want to propagate a template file then add the password to my copy. The copy with the password should be ignored and not overwritten.
– bmacnaughton
Nov 20 '16 at 16:23
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How to use putExtra() and getExtra() for string data
....class);
String strName = null;
i.putExtra("STRING_I_NEED", strName);
Then, to retrieve the value try something like:
String newString;
if (savedInstanceState == null) {
Bundle extras = getIntent().getExtras();
if(extras == null) {
newString= null;
} else {
newStrin...
java.nio.file.Path for a classpath resource
... Files.list(p)) {
stream.forEach(System.out::println);
}
});
Then, it will again work with all versions and storage methods.
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