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How to rollback a specific migration?
...back everything. Not nice! This was Rails 4.2 - I guess it may be fixed by now.
– Dave Hartnoll
Mar 13 '18 at 16:37
1
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Passing base64 encoded strings in URL
...
There are additional base64 specs. (See the table here for specifics ). But essentially you need 65 chars to encode: 26 lowercase + 26 uppercase + 10 digits = 62.
You need two more ['+', '/'] and a padding char '='. But none of them are url friendly, so just use different chars for th...
Is it possible to get the non-enumerable inherited property names of an object?
...etOwnPropertyNames(curr)
props.forEach(function(prop){
if (allProps.indexOf(prop) === -1)
allProps.push(prop)
})
}while(curr = Object.getPrototypeOf(curr))
return allProps
}
I tested that on Safari 5.1 and got
> getAllProperties([1,2,3])
["0"...
Flatten nested dictionaries, compressing keys
...ems = []
for k, v in d.items():
new_key = parent_key + sep + k if parent_key else k
if isinstance(v, collections.MutableMapping):
items.extend(flatten(v, new_key, sep=sep).items())
else:
items.append((new_key, v))
return dict(items)
>>&g...
What should main() return in C and C++?
...s to someone reading your code. This question is proof that people don't know what valid/invalid codes are. EXIT_SUCCESS/EXIT_FAILURE are much more clear.
– JaredPar
Oct 15 '08 at 16:32
...
How do i find out what all symbols are exported from a shared object?
...d library on AIX), a UNIX shared library, or a Windows DLL? These are all different things, and your question conflates them all :-(
For an AIX shared object, use dump -Tv /path/to/foo.o.
For an ELF shared library, use readelf -Ws /path/to/libfoo.so, or (if you have GNU nm) nm -D /path/to/libfoo.s...
How to list branches that contain a given commit?
...ranch --contains <commit>
Only list branches which contain the specified commit (HEAD if not specified). Implies --list.
git branch -r --contains <commit>
Lists remote tracking branches as well (as mentioned in user3941992's answer below) that is "local branches that have a direct ...
How to pass parameters to a view
...er attached automatically to the view (see issue 2458 for discussion). You now need to attach the options of each view manually:
MenuView = Backbone.View.extend({
initialize: function(options) {
_.extend(this, _.pick(options, "position", ...));
}
});
new MenuView({
collection: ...
Rounding up to next power of 2
...te a function that returns the nearest next power of 2 number. For example if my input is 789, the output should be 1024. Is there any way of achieving this without using any loops but just using some bitwise operators?
...
Append an object to a list in R in amortized constant time, O(1)?
If I have some R list mylist , you can append an item obj to it like so:
17 Answers
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