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JavaScript “new Array(n)” and “Array.prototype.map” weirdness
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I had a task that I only knew the length of the array and needed to transform the items.
I wanted to do something like this:
let arr = new Array(10).map((val,idx) => idx);
To quickly create an array like this:
[0,1,2,3,4,5,6,7,8,9]
But it didn't work b...
How to create an AVD for Android 4.0
...or using IntelliJ on Mac OSX. 1. Confirm ARM EABI is installed 2. Tools->Android->AVD Manager-> Create new AVD 3. Run->Edit Configurations->Android Application or Android Tests -> Emulator (radio button) -> Select your newly created AVD
– Ted Spradley
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How do I put a variable inside a string?
...) in Python 3.6, it is now possible to write this with a briefer syntax:
>>> name = "Fred"
>>> f"He said his name is {name}."
'He said his name is Fred.'
With the example given in the question, it would look like this
plot.savefig(f'hanning{num}.pdf')
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How to randomize (shuffle) a JavaScript array?
...ked to this)
function shuffle(array) {
var currentIndex = array.length, temporaryValue, randomIndex;
// While there remain elements to shuffle...
while (0 !== currentIndex) {
// Pick a remaining element...
randomIndex = Math.floor(Math.random() * currentIndex);
curre...
Login failed for user 'DOMAIN\MACHINENAME$'
...ng over a solution that works always and is very simple.
Go to SQL Server >> Security >> Logins and right click on NT AUTHORITY\NETWORK SERVICE and select Properties
In newly opened screen of Login Properties, go to the “User Mapping” tab. Then, on the “User Mapping” tab, select...
iOS Image Orientation has Strange Behavior
...ntity;
CGRect bounds = CGRectMake(0, 0, width, height);
if (width > kMaxResolution || height > kMaxResolution) {
CGFloat ratio = width/height;
if (ratio > 1) {
bounds.size.width = kMaxResolution;
bounds.size.height = bounds.size.width / ratio;...
Why are trailing commas allowed in a list?
...tinuation and ()s as a precendence operator, whereas ('a',) refers to a length 1 tuple.
Your original example would have been tuple('a')
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How does the SQL injection from the “Bobby Tables” XKCD comic work?
...g to
-- sanitize the input, such as by escaping special characters
school=> INSERT INTO students VALUES ('Nancy');
INSERT 0 1
-- SQL injection occurs when input into a database command is manipulated to
-- cause the database server to execute arbitrary SQL
school=> INSERT INTO students VALUES...
What is the difference between “ is None ” and “ ==None ”
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@myusuf3: >>> timeit.Timer('None is None').timeit() | 0.225 | >>> timeit.Timer('None == None').timeit() | 0.328
– Nas Banov
Jan 25 '12 at 21:44
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What is an intuitive explanation of the Expectation Maximization technique? [closed]
... the red and blue values to the builtin functions in NumPy. For example:
>>> np.mean(red)
2.802
>>> np.std(red)
0.871
>>> np.mean(blue)
6.932
>>> np.std(blue)
2.195
But what if we can't see the colours of the points? That is, instead of red or blue, every point...