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Better way to sum a property value in an array
...erCollection extends Array {
sum(key) {
return this.reduce((a, b) => a + (b[key] || 0), 0);
}
}
const traveler = new TravellerCollection(...[
{ description: 'Senior', Amount: 50},
{ description: 'Senior', Amount: 50},
{ description: 'Adult', Amount: 75},
{ desc...
join list of lists in python [duplicate]
...
import itertools
a = [['a','b'], ['c']]
print(list(itertools.chain.from_iterable(a)))
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Chrome sendrequest error: TypeError: Converting circular structure to JSON
...
It means that the object you pass in the request (I guess it is pagedoc) has a circular reference, something like:
var a = {};
a.b = a;
JSON.stringify cannot convert structures like this.
N.B.: This would be the case with DOM nodes, which h...
What is the purpose of Rank2Types?
I am not really proficient in Haskell, so this might be a very easy question.
6 Answers
...
Get querystring from URL using jQuery [duplicate]
...
From: http://jquery-howto.blogspot.com/2009/09/get-url-parameters-values-with-jquery.html
This is what you need :)
The following code will return a JavaScript Object containing the URL parameters:
// Read a page's GET URL variables and return them ...
How to calculate number of days between two dates
...tps://date-fns.org/
From Moment docs:
var a = moment([2007, 0, 29]);
var b = moment([2007, 0, 28]);
a.diff(b, 'days') // =1
or to include the start:
a.diff(b, 'days')+1 // =2
Beats messing with timestamps and time zones manually.
Depending on your specific use case, you can either
Use ...
Applicatives compose, monads don't
What does the above statement mean? And when is one preferable to other?
5 Answers
5
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How do I define a method which takes a lambda as a parameter in Java 8?
In Java 8, methods can be created as Lambda expressions and can be passed by reference (with a little work under the hood). There are plenty of examples online with lambdas being created and used with methods, but no examples of how to make a method taking a lambda as a parameter. What is the syntax...
Java: Class.this
...s refers to this of the enclosing class.
This example should explain it:
public class LocalScreen {
public void method() {
new Runnable() {
public void run() {
// Prints "An anonymous Runnable"
System.out.println(this.toString());...
Convert a binary NodeJS Buffer to JavaScript ArrayBuffer
How can I convert a NodeJS binary buffer into a JavaScript ArrayBuffer?
12 Answers
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