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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
..., Groovy, and
Swift, is introduced to ease nil handling as obj&.foo. Array#dig and
Hash#dig are also added.
This means as of 2.3 below code
account.try(:owner).try(:address)
can be rewritten to
account&.owner&.address
However, one should be careful that & is not a drop in...
Find integer index of rows with NaN in pandas dataframe
...9 -0.686914 0.131185
In [10]: pd.isnull(df).any(1).nonzero()[0]
Out[10]: array([3, 6])
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Getting a list item by index
...t explains why it's possible to access a list, which is an object, like an array
– PrashanD
Apr 26 '17 at 7:10
Does it...
How to return an NSMutableArray from an NSSet
I'm able to put the contents of an NSSet into an NSMutableArray like this:
3 Answers
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Is it possible to get the non-enumerable inherited property names of an object?
...n(obj).forEach(p => props.add(p)); while (obj = proto(obj));
return Array.from(props);
}
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How to test if a string is JSON or not?
...es: A collection of name/value pair (object) or an ordered list of values (array).
Argument: Exception handling shouldn't be used to do something expected.
(This is a comment that has 25+ upvotes!)
FACT: No! It's definitely legal to use try/catch, especially in a case like this. Otherwise, ...
Switch statement for string matching in JavaScript
...ically with the match method too.
Because the output of the match() is an array we need to retrieve the first array element of the result. When the match fails, the function returns null. To avoid an exception error we will add the || conditional operator before accessing the first array element an...
How to remove multiple indexes from a list at the same time? [duplicate]
... Please excuse my comment, I'm learning Python, but Python reindex the array while looping for delete ? Why if you loop in normal order it raise an undefined offset exception ?
– kitensei
Jun 20 '14 at 21:19
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C/C++ maximum stack size of program
I want to do DFS on a 100 X 100 array. (Say elements of array represents graph nodes) So assuming worst case, depth of recursive function calls can go upto 10000 with each call taking upto say 20 bytes. So is it feasible means is there a possibility of stackoverflow?
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Printing Java Collections Nicely (toString Doesn't Return Pretty Output)
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You could convert it to an array and then print that out with Arrays.toString(Object[]):
System.out.println(Arrays.toString(stack.toArray()));
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