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Equivalent of .try() for a hash to avoid “undefined method” errors on nil? [duplicate]
...lets you to dig in the hash deeper than you could with using direct .try() calls, if you want the code still look nice:
class Hash
def get_deep(*fields)
fields.inject(self) {|acc,e| acc[e] if acc}
end
end
You should be careful with various objects (especially params), because Strings and ...
Sort a list from another list IDs
... thats why I upvoted too, does rely on knowing the document ID property is called Id. Its not specified in the question.
– Jodrell
Mar 7 '13 at 16:13
3
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Find object in list that has attribute equal to some value (that meets any condition)
...## [1, 2, 3, 4, 5, 5, 6] Will Return: ###
# 5
# 5
# Traceback (most recent call last):
# File "C:\Users\mousavin\workspace\Scripts\test.py", line 22, in <module>
# print(next(my_filter_iter).value)
# StopIteration
# You can do that None stuff or whatever at this point, if you don't lik...
How do I implement an Objective-C singleton that is compatible with ARC?
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What about if somebody calls [[MyClass alloc] init]? That would create a new object. How can we avoid this (other than declaring static MyClass *sharedInstance = nil outside the method).
– Ricardo Sanchez-Saez
...
Execute stored procedure with an Output parameter?
... I know all other possible ways to execute stored procedure(like EXEC , calling from C# or PHP) but this is the easiest and a non technical person can do this. so +1 for this and thx for sharing the information.
– Dhaval
Sep 3 '13 at 11:13
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Code for a simple JavaScript countdown timer?
...nds to count down
onUpdateStatus: function(sec){console.log(sec);}, // callback for each second
onCounterEnd: function(){ alert('counter ended!');} // final action
});
myCounter.start();
function Countdown(options) {
var timer,
instance = this,
seconds = options.seconds || 10,
u...
Deleting Row in SQLite in Android
...So it is not related to the UI. You just have to give information as dynamically so there is no need of security. If you follow the vijay's answer and some one do reverse engineering then you might got information about table with in the database and field you are compering. which i am doing directl...
Referring to the null object in Python
... if not value:
value = init_value()
In the above, did you mean to call init_value() when the value is set specifically to None, or did you mean that a value set to 0, or the empty string, or an empty list should also trigger the initialization? Like I said, be mindful. As it's often the cas...
MySQL foreign key constraints, cascade delete
... a stored procedure that will delete a category the way you want, and then call that procedure whenever you want to delete a category.
CREATE PROCEDURE `DeleteCategory` (IN category_ID INT)
LANGUAGE SQL
NOT DETERMINISTIC
MODIFIES SQL DATA
SQL SECURITY DEFINER
BEGIN
DELETE FROM
`products`
WHERE...
FragmentPagerAdapter getItem is not called
...Using destroyItem() method, It is deleting the fragment but still does not called getItem() again..There are just 2-3 Images so I am using FragmentPagerAdapter Instead of FragmentStatePagerAdapter..
...