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Javascript split regex question
...egExp('[,;\n]', 'g'));
Finally, you may need to trim the elements in the array:
let elements = rawElements.map(element => element.trim());
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...
presentViewController and displaying navigation bar
...Controller].viewControllers = [[self navigationController].viewControllers arrayByAddingObject:controller];
//You can't just [[self navigationController].viewControllers addObject:controller] because viewControllers are for some reason not a mutable array.
Edit: Sorry, presentViewController will f...
Convert Go map to json
...g/json/#Unmarshal You could use a slice instead, which will map to a JSON array. Also: always check for errors ;)
– seong
Jul 9 '14 at 11:50
...
Passing data between controllers in Angular JS?
...ProductController, define some action that adds the selected object to the array:
app.controller('ProductController', function($scope, productService) {
$scope.callToAddToProductList = function(currObj){
productService.addProduct(currObj);
};
});
In your CartController, get the pr...
Collapse sequences of white space into a single character and trim string
...cate *noEmptyStrings = [NSPredicate predicateWithFormat:@"SELF != ''"];
NSArray *parts = [theString componentsSeparatedByCharactersInSet:whitespaces];
NSArray *filteredArray = [parts filteredArrayUsingPredicate:noEmptyStrings];
theString = [filteredArray componentsJoinedByString:@" "];
...
Filtering Pandas DataFrames on dates
...import numpy as np
df = pd.DataFrame()
ts = pd.Timestamp
df['date'] = np.array(np.arange(10) + datetime.now().timestamp(), dtype='M8[s]')
print(df)
print(df.query('date > @ts("20190515T071320")')
with the output
date
0 2019-05-15 07:13:16
1 2019-05-15 07:13:17
2 2019-05-15 ...
How to wait for a number of threads to complete?
...
You put all threads in an array, start them all, and then have a loop
for(i = 0; i < threads.length; i++)
threads[i].join();
Each join will block until the respective thread has completed. Threads may complete in a different order than you joi...
Creating the Singleton design pattern in PHP5
...e Singleton base class.
class Singleton
{
private static $instances = array();
protected function __construct() {}
protected function __clone() {}
public function __wakeup()
{
throw new Exception("Cannot unserialize singleton");
}
public static function getInsta...
What do ellipsis […] mean in a list?
...not create an "infinite list" in Python because lists are indeed resizable arrays, not linked lists. An "infinite list" in Common Lisp could instead be created with #1=(1 . #1#).
– 6502
Jun 18 '13 at 20:09
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What is the result of % in Python?
...d it is very important in computer science. It is also used to wrap around arrays, allowing you to increase the index and use the modulus to wrap back to the beginning after you reach the end of the array.
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