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How to calculate time elapsed in bash script?
...ate into performing the time arithmetic for you, by writing date -u -d @"$diff" +'%-Mm %-Ss'. (That interprets $diff as seconds-since-the-epoch, and computes the minutes and seconds in UTC.) That's probably not any more elegant, though, just better obfuscated. :-P
– ruakh
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Check if class already assigned before adding
In jQuery, is it recommended to check if a class is already assigned to an element before adding that class? Will it even have any effect at all?
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How can I detect if this dictionary key exists in C#?
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You can use ContainsKey:
if (dict.ContainsKey(key)) { ... }
or TryGetValue:
dict.TryGetValue(key, out value);
Update: according to a comment the actual class here is not an IDictionary but a PhysicalAddressDictionary, so the methods are Contai...
Rails detect if request was AJAX
In my action I wish to only respond with processing if it was called from an AJAX request. How do I check?
5 Answers
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How to get the last N records in mongodb?
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If I understand your question, you need to sort in ascending order.
Assuming you have some id or date field called "x" you would do ...
.sort()
db.foo.find().sort({x:1});
The 1 will sort ascending (oldest to newest) an...
Change Active Menu Item on Page Scroll?
... menuItems.map(function(){
var item = $($(this).attr("href"));
if (item.length) { return item; }
});
// Bind to scroll
$(window).scroll(function(){
// Get container scroll position
var fromTop = $(this).scrollTop()+topMenuHeight;
// Get id of current scroll item
var cur...
How to check if all of the following items are in a list?
I found, that there is related question, about how to find if at least one item exists in a list:
How to check if one of the following items is in a list?
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Validating parameters to a Bash script
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~/myfolder3/$1/thisisafolder
EOF
edit: I missed the part about checking if the directories exist at first, so I added that in, completing the script. Also, have addressed issues raised in comments; fixed the regular expression, switched from == to eq.
This should be a portable, POSIX compliant s...
Python list of dictionaries search
...name": "Dick", "age": 12 }
... ]
>>> next(item for item in dicts if item["name"] == "Pam")
{'age': 7, 'name': 'Pam'}
If you need to handle the item not being there, then you can do what user Matt suggested in his comment and provide a default using a slightly different API:
next((item f...
Get the last item in an array
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if (loc_array[loc_array.length - 1] === 'index.html') {
// do something
} else {
// something else
}
In the event that your server serves the same file for "index.html" and "inDEX.htML" you can also use: .toLowerCase(...