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Why covariance and contravariance do not support value type
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126
Basically, variance applies when the CLR can ensure that it doesn't need to make any represent...
Python: Append item to list N times
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129
For immutable data types:
l = [0] * 100
# [0, 0, 0, 0, 0, ...]
l = ['foo'] * 100
# ['foo', '...
Is it valid to have a tag inside another tag?
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153
Yes! w3 encourages you to explicitly wrap sections in elements of sectioning content, instead ...
How do I shuffle an array in Swift?
...uffle and shuffled are native starting Swift 4.2. Example usage:
let x = [1, 2, 3].shuffled()
// x == [2, 3, 1]
let fiveStrings = stride(from: 0, through: 100, by: 5).map(String.init).shuffled()
// fiveStrings == ["20", "45", "70", "30", ...]
var numbers = [1, 2, 3, 4]
numbers.shuffle()
// number...
How to make jQuery to not round value returned by .width()?
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198
Use the native Element.getBoundingClientRect rather than the style of the element. It was intr...
parseInt(null, 24) === 23… wait, what?
..., there are no numerals it can convert, so it returns NaN. At 24, "n", the 14th letter, is added to the numeral system. At 31, "u", the 21st letter, is added and the entire string can be decoded. At 37 on there is no longer any valid numeral set that can be generated and NaN is returned.
js> par...
mysql check collation of a table
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161
SHOW TABLE STATUS shows information about a table, including the collation.
For example SHOW ...
How do I explicitly specify a Model's table-name mapping in Rails?
...tries < ActiveRecord::Base
self.table_name = "cc"
end
Rails <= 3.1:
class Countries < ActiveRecord::Base
self.set_table_name "cc"
...
end
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How to create abstract properties in python abstract classes
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121
Since Python 3.3 a bug was fixed meaning the property() decorator is now correctly identified ...
JavaScript get window X/Y position for scroll
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The method jQuery (v1.10) uses to find this is:
var doc = document.documentElement;
var left = (window.pageXOffset || doc.scrollLeft) - (doc.clientLeft || 0);
var top = (window.pageYOffset || doc.scrollTop) - (doc.clientTop || 0);
That is:
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