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Is there a “null coalescing” operator in JavaScript?
...ing to MDN. See also Why is JavaScript's For…In loop not recommended for arrays? and Why is using “for…in” with array iteration such a bad idea?.
– MvG
Aug 17 '15 at 9:41
...
Python 2.7: Print to File
...
I'd like to print a whole array to the file. If I use your code, only the head and tail of array was printed, like the output from terminal. How to print all array lines to the file?
– Sigur
Jun 1 '17 at 14:13
...
Creating multiline strings in JavaScript
...o keep oversight with complex or long multiline strings I sometimes use an array pattern:
var myString =
['<div id="someId">',
'some content<br />',
'<a href="#someRef">someRefTxt</a>',
'</div>'
].join('\n');
or the pattern anonymous already showed...
Appending the same string to a list of strings in Python
...lue='@',shape=len(lst1),dtype=object) #optional third list
result = np.array(lst1,dtype=object)+at+np.array(lst2,dtype=object)
Result:
array(['a@1', 'b@2', 'c@3', 'd@4', 'e@5'], dtype=object)
dtype odject may be further converted str
...
What does “where T : class, new()” mean?
...ent must be a reference type, including any class, interface, delegate, or array type. (See note below.)
where T : new()
The type argument must have a public parameterless constructor. When used in conjunction with other constraints, the new() constraint must be specified last.
where T : [base cla...
Reading in a JSON File Using Swift
...ers, error: nil) as? NSDictionary
{
if let persons : NSArray = jsonResult["person"] as? NSArray
{
// Do stuff
}
}
}
}
The array "persons" will contain all data for key person. Iterate throughs to fetch it.
Swift 4.0:
if let...
How to find time complexity of an algorithm
... requires the same amount of time regardless of the input size.
Examples:
array: accessing any element
fixed-size stack: push and pop methods
fixed-size queue: enqueue and dequeue methods
4. O(n) Linear Time
An algorithm is said to run in linear time if its time execution is directly proportional ...
Get all attributes of an element using jQuery
...ributes, function() {
// this.attributes is not a plain object, but an array
// of attribute nodes, which contain both the name and value
if(this.specified) {
console.log(this.name, this.value);
}
});
});
What you can also do is extending .attr so that you can call it lik...
How to delete all the rows in a table using Eloquent?
...is got me on my way. I ended up doing a pluck() on another model to get an array of the ID's I needed, then used that array to delete all the records from my model using the whereIn method: $itemsAllContentIDs = Item::where('user_id', $userId)->pluck('item_content_id')->all(); ItemsContent::w...
Difference between List, List, List, List, and List
..., V for value and K for key. The method that compiles says that it took an array of a certain type, and returns an array of the same type.
4) You can't mix oranges and apples. You would be able to add an Object to your String list if you could pass a string list to a method that expects object list...