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Python group by

Assume that I have a set of data pair where index 0 is the value and index 1 is the type: 6 Answers ...
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Remove not alphanumeric characters from string

...; i < json_string.length; i++) { let char = json_string[i] let index = alpha_numeric.indexOf(char) if (index > -1) { filterd_string += alpha_numeric[index] } } return filterd_string } const input = "\\test\red\bob\fred\new" console.log(alpha_numeric_filter(input)...
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Swift: Pass array by reference?

...n, Reflectable, ... { var array : Array<T> // ... subscript (index: Int) -> T { get { return array[index] } set(newValue) { array[index] = newValue } } } Use the BoxedArray anywhere you'd use an Array. Assigning of a BoxedArray will be by reference, it is a class, and ...
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PostgreSQL - max number of parameters in “IN” clause?

... worry about overloading the query plan optimizer or getting plans without index usage, since it will transform the query to use = ANY({...}::integer[]) where it can leverage indices as expected: -- prepare statement, runs instantaneous: PREPARE hugeplan (integer, integer, integer, ...) AS SELECT *...
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PHP session lost after redirect

...url' inside the redirecting header ! header("location: http://example.com/index.php") nullified the session cookies header("location: index.php") worked like a charm ! share | improve this ans...
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How to generate a random alpha-numeric string?

...udo-random alpha-numeric string. In my situation it would be used as a unique session/key identifier that would "likely" be unique over 500K+ generation (my needs don't really require anything much more sophisticated). ...
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Html.ActionLink as a button or an image, not a link

...lass to the htmlAttributes object. <%= Html.ActionLink("Button Name", "Index", null, new { @class="classname" }) %> and then create a class in your stylesheet a.classname { background: url(../Images/image.gif) no-repeat top left; display: block; width: 150px; height: 150...
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Python Dictionary Comprehension

...1) x_s = range(1, 11) # x_s = range(11, 1, -1) # Also works d = dict([(i_s[index], x_s[index], ) for index in range(len(i_s))]) share | improve this answer | follow ...
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How do I store an array in localStorage? [duplicate]

...y "length" to determine the count of saved objects and the method "key(int index)" to get the current key. So you can try: for (var i = 0; i < localStorage.length; i++) console.log( localStorage.key(i) +" has value " + localStorage[localStorage.key(i)] ) – Sebastian ...
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Unmangling the result of std::type_info::name

... Given the attention this question / answer receives, and the valuable feedback from GManNickG, I have cleaned up the code a little bit. Two versions are given: one with C++11 features and another one with only C++98 features. In file type.hpp #if...