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Evaluating a mathematical expression in a string
...low, I've rewrapped fourFn into a numeric parser class for easier reuse.
from __future__ import division
from pyparsing import (Literal, CaselessLiteral, Word, Combine, Group, Optional,
ZeroOrMore, Forward, nums, alphas, oneOf)
import math
import operator
__author__ = 'Paul...
Generating an Excel file in ASP.NET [closed]
... of Excel (pre-2000)
Write-only, in that once you open it and make changes from Excel it's converted to native Excel.
XLS (generated by third party component)
Pros:
Generate native Excel file with all the formating, formulas, etc.
Cons:
Cost money
Add dependencies
COM Interop
Pros:
Us...
How to randomize (shuffle) a JavaScript array?
...It picks a random element for each original array element, and excludes it from the next draw, like picking randomly from a deck of cards.
This clever exclusion swaps the picked element with the current one, then picks the next random element from the remainder, looping backwards for optimal effici...
Why should I use IHttpActionResult instead of HttpResponseMessage?
...method of the base class ApiController that your controller should inherit from.
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Assigning a variable NaN in python without numpy
...
Yes -- use math.nan.
>>> from math import nan
>>> print(nan)
nan
>>> print(nan + 2)
nan
>>> nan == nan
False
>>> import math
>>> math.isnan(nan)
True
Before Python 3.5, one could use float("nan") (case i...
How to inflate one view with a layout
... I have my main view inflated. The problem is I want to inflate part of it from other XML file. This item RelativeLayout is part of bigger layout and I want to fill it with layout from another XML file.
– Michal Dymel
Feb 25 '10 at 16:58
...
Array versus List: When to use which?
...tually no collections are ever mutated. That is; collections are retrieved from the database or constructed from some source, but further processing is always done by recreating a new collection (e.g. map/filter etc). Even where conceptual mutation is necessary, it tends to be simplest to just gener...
Define: What is a HashSet?
...anaging an array and storing the object using an index which is calculated from the hashcode of the object. Take a look here
HashSet is an unordered collection containing unique elements. It has the standard collection operations Add, Remove, Contains, but since it uses a hash-based implementation, ...
CABasicAnimation resets to initial value after animation completes
..., your instance will be retained by the animation. So, after calling removeFromSuperview if you forget to remove/destroy the animation by yourself, dealloc for instance will not be called. You'll have a memory leak.
– emrahgunduz
Jan 22 '15 at 14:07
...
Why create “Implicitly Unwrapped Optionals”, since that implies you know there's a value?
...n: UIButton!
var buttonOriginalWidth: CGFloat!
override func awakeFromNib() {
self.buttonOriginalWidth = self.button.frame.size.width
}
}
Here, you cannot calculate the original width of the button until the view loads, but you know that awakeFromNib will be called before any ...