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How do you know when to use fold-left and when to use fold-right?
...oldr proceeds:
1 + (2 + (3 + 4))
where you can see the traversal to the base case 4 and building up the result from there.
So I posit a rule of thumb: if it looks like a list iteration, one that would be simple to write in tail-recursive form, foldl is the way to go.
But really this will be pro...
Real world example about how to use property feature in python?
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if value > 10:
raise ValueError("This pedometer is based on the human stride - a stride length above 10m is not supported")
else:
self._stride_length = value
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How do I find the duplicates in a list and create another list with them?
...anking slightly changes when pypy is used. Most interestingly, the Counter-based approach benefits hugely from pypy's optimizations, whereas the method caching approach I have suggested seems to have almost no effect.
$ pypy -mtimeit -s 'import test' 'test.JohnLaRooy(test.l)'
100000 loops, best of ...
How do I check if there are duplicates in a flat list?
...an be ignored, which is the ultimate shortcut.
This is an interesting set based approach I adapted straight from moooeeeep:
def getDupes(l):
seen = set()
seen_add = seen.add
for x in l:
if x in seen or seen_add(x):
yield x
Accordingly, a full list of dupes would b...
How to print to console in pytest?
... for help, clarification, or responding to other answers.Making statements based on opinion; back them up with references or personal experience.To learn more, see our tips on writing great answers.
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How do I import other TypeScript files?
...h tsc on your main .ts file. The compiler figures out all the dependencies based on your reference tags and generates a single output .js file for the entire application: tsc --out app.js main.ts
– null
Apr 13 '14 at 9:57
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Get url without querystring
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BrandonBrandon
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Rotating a point about another point (2D)
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How to add target=“_blank” to JavaScript window.location?
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how to get the current working directory's absolute path from irb
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