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How to map and remove nil values in Ruby
...s = [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 good read on the subject, with some performance benchmarks against some...
What is 'Currying'?
... example in JavaScript:
function add (a, b) {
return a + b;
}
add(3, 4); // returns 7
This is a function that takes two arguments, a and b, and returns their sum. We will now curry this function:
function add (a) {
return function (b) {
return a + b;
}
}
This is a function that ta...
Is it possible to set private property via reflection?
...
t.GetProperty("CreatedOn")
.SetValue(obj, new DateTime(2009, 10, 14), null);
EDIT: Since the property itself is public, you apparently don't need to use BindingFlags.NonPublic to find it. Calling SetValue despite the the setter having less accessibility still does what you expect.
...
How to check whether a string is Base64 encoded or not
I want to decode a Base64 encoded string, then store it in my database. If the input is not Base64 encoded, I need to throw an error.
...
How to check if two arrays are equal with JavaScript? [duplicate]
...
294
This is what you should do. Please do not use stringify nor < >.
function arraysEqual(a, ...
Permanently add a directory to PYTHONPATH?
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answered Aug 4 '10 at 2:33
Alex MartelliAlex Martelli
724k148148 gold badges11251125 silver badges13241324 bronze badges
...
Java 8 stream reverse order
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answered Jun 3 '14 at 9:13
Stuart MarksStuart Marks
103k3232 gold badges176176 silver badges233233 bronze badges
...
Convert integer into byte array (Java)
...
Have a look at the ByteBuffer class.
ByteBuffer b = ByteBuffer.allocate(4);
//b.order(ByteOrder.BIG_ENDIAN); // optional, the initial order of a byte buffer is always BIG_ENDIAN.
b.putInt(0xAABBCCDD);
byte[] result = b.array();
Setting the byte order ensures that result[0] == 0xAA, result[1] =...
How to run a python script from IDLE interactive shell?
...
145
Python3:
exec(open('helloworld.py').read())
If your file not in the same dir:
exec(open('./...
JavaScript: location.href to open in new window/tab?
... |
edited Mar 27 '14 at 6:23
answered Feb 28 '11 at 12:24
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