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Reverse a string in Python
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How about:
>>> 'hello world'[::-1]
'dlrow olleh'
This is extended slice syntax. It works by doing [begin:end:step] - by leaving begin and end off and specifying a step of -1, it reverses a string.
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bundle install fails with SSL certificate verification error
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312
Update
Now that I've karma wh..err mined enough from this answer everyone should know that thi...
Add single element to array in numpy
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167
append() creates a new array which can be the old array with the appended element.
I think it...
Can hash tables really be O(1)?
It seems to be common knowledge that hash tables can achieve O(1), but that has never made sense to me. Can someone please explain it? Here are two situations that come to mind:
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Lambda function in list comprehensions
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271
The first one creates a single lambda function and calls it ten times.
The second one doesn't ca...
Get the index of the nth occurrence of a string?
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10 Answers
10
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How to create NS_OPTIONS-style bitmask enumerations in Swift?
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15 Answers
15
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Best way to find if an item is in a JavaScript array? [duplicate]
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As of ECMAScript 2016 you can use includes()
arr.includes(obj);
If you want to support IE or other older browsers:
function include(arr,obj) {
return (arr.indexOf(obj) != -1);
}
EDIT:
This will not work on IE6, 7 or 8 though. The bes...