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Trim spaces from start and end of string
...cript performance this test is still relevant or reliable as it was at the time of this answer.
– Eduardo
Nov 30 '12 at 10:11
2
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When do you use varargs in Java?
...ou consider adding a precondition check if (args.length == 0) throw new RuntimeException("foo"); instead? (Since the caller was violating the contract)
– Micha Wiedenmann
Apr 29 '13 at 14:46
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String is immutable. What exactly is the meaning? [duplicate]
...so "bar" is a reference to the same String instance regardless of how many times it appears in your code.
The "hello" creates one instance that is pooled, and the new String(...) creates a non-pooled instance. Try System.out.println(("hello" == "hello") + "," + (new String("hello") == "hello") + ...
How does the Java 'for each' loop work?
...ment primitive-int array (A is iterator, B is index):
[C:\java_code\]java TimeIteratorVsIndexIntArray 1000000
Test A: 358,597,622 nanoseconds
Test B: 269,167,681 nanoseconds
B faster by 89,429,941 nanoseconds (24.438799231635727% faster)
[C:\java_code\]java TimeIteratorVsIndexIntArray 1000000
Test...
Java; String replace (using regular expressions)?
...attern? This might be useful if you do replaceAll with the same regex many times.
– qed
Nov 5 '14 at 20:35
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How do you do a deep copy of an object in .NET? [duplicate]
...work.
Your source file must include the following code:
using System.Runtime.Serialization.Formatters.Binary;
using System.IO;
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How do you get the magnitude of a vector in Numpy?
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mag = np.sqrt(x.dot(x))
Here are some benchmarks:
>>> import timeit
>>> timeit.timeit('np.linalg.norm(x)', setup='import numpy as np; x = np.arange(100)', number=1000)
0.0450878
>>> timeit.timeit('np.sqrt(x.dot(x))', setup='import numpy as np; x = np.arange(100)', num...
How to create an alias for a command in Vim?
... This is the single best tip for vim. I'm so used to it now that every time I encounter the normal behavior, it takes me a few tried to get my mind retrained.
– airstrike
Feb 24 '15 at 19:58
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How to count the number of set bits in a 32-bit integer?
...in, producing 8x 4-bit sums. The i - ... optimization isn't possible this time so it does just mask before / after shifting. Using the same 0x33... constant both times instead of 0xccc... before shifting is a good thing when compiling for ISAs that need to construct 32-bit constants in registers s...
Seeding the random number generator in Javascript
...oose some dummy data to pad the seed with, and advance the generator a few times (12-20 iterations) to mix the initial state thoroughly. This is often seen in reference implementations of PRNGs, but it does limit the number of initial states.
var seed = 1337 ^ 0xDEADBEEF; // 32-bit seed with option...