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Rollback a Git merge
... feeling the moxy (and haven't done anything else): git reset --hard HEAD@{1}
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Batch file include external file for variables
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133
Note: I'm assuming Windows batch files as most people seem to be unaware that there are signif...
How to map and remove nil values in Ruby
... and I'd expect it to become the norm very soon.
For example:
numbers = [1, 2, 5, 8, 10, 13]
enum.filter_map { |i| i * 2 if i.even? }
# => [4, 16, 20]
In your case, as the block evaluates to falsey, simply:
items.filter_map { |x| process_x url }
"Ruby 2.7 adds Enumerable#filter_map" is a g...
What is the correct syntax for 'else if'?
I'm a new Python programmer who is making the leap from 2.6.4 to 3.1.1. Everything has gone fine until I tried to use the 'else if' statement. The interpreter gives me a syntax error after the 'if' in 'else if' for a reason I can't seem to figure out.
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Consistency of hashCode() on a Java string
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102
I can see that documentation as far back as Java 1.2.
While it's true that in general you sho...
[] and {} vs list() and dict(), which is better?
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198
In terms of speed, it's no competition for empty lists/dicts:
>>> from timeit import...
Best way to represent a fraction in Java?
...arable<BigFraction>
{
private static final long serialVersionUID = 1L; //because Number is Serializable
private final BigInteger numerator;
private final BigInteger denominator;
public final static BigFraction ZERO = new BigFraction(BigInteger.ZERO, BigInteger.ONE, true);
public fin...
How to initialize all members of an array to the same value?
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1276
Unless that value is 0 (in which case you can omit some part of the initializer
and the corre...
Multi-line commands in GHCi
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187
Most of the time, you can rely on type inference to work out a signature for you. In your exam...