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Why is string concatenation faster than array join?
... browser to optimize string concatenation. Beginning with version 1.0, the array technique is actually slower than using the plus operator in all cases. Other browsers have also optimized string concatenation, so Safari, Opera, Chrome, and Internet Explorer 8 also show better performance using the p...
How do you copy the contents of an array to a std::vector in C++ without looping?
I have an array of values that is passed to my function from a different part of the program that I need to store for later processing. Since I don't know how many times my function will be called before it is time to process the data, I need a dynamic storage structure, so I chose a std::vector ....
Numpy array dimensions
I'm currently trying to learn Numpy and Python. Given the following array:
8 Answers
8...
PHP function overloading
...
case 1:
return call_user_func_array(array($this, 'funcOneWithOneArg'), $args);
case 3:
return call_user_func_array(array($this, 'funcOneWithThreeArgs'), $args);
}
case 'anotherFunc':...
Sort Dictionary by keys
...[
"A" : [1, 2],
"Z" : [3, 4],
"D" : [5, 6]
]
let sortedKeys = Array(dictionary.keys).sorted(<) // ["A", "D", "Z"]
EDIT:
The sorted array from the above code contains keys only, while values have to be retrieved from the original dictionary. However, 'Dictionary' is also a 'Collect...
How to find the array index with a value?
...List.indexOf(200); // 1
You will get -1 if it cannot find a value in the array.
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Set operations (union, intersection) on Swift array?
...y standard library calls I can use to either perform set operations on two arrays, or implement such logic myself (ideally as functionally and also efficiently as possible)?
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Python memory usage of numpy arrays
...sizeof() to try and keep track of the usage, but it's behaviour with numpy arrays is bizarre. Here's an example involving a map of albedos that I'm having to open:
...
Given an array of numbers, return array of products of all other numbers (no division)
...explanation of polygenelubricants method is:
The trick is to construct the arrays (in the case for 4 elements)
{ 1, a[0], a[0]*a[1], a[0]*a[1]*a[2], }
{ a[1]*a[2]*a[3], a[2]*a[3], a[3], 1, }
Both of which can be done in O(n) by starting at t...
Is std::vector so much slower than plain arrays?
...s thought it's the general wisdom that std::vector is "implemented as an array," blah blah blah. Today I went down and tested it, and it seems to be not so:
...