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How do you query for “is not null” in Mongo?
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10 Answers
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Check if an array contains any element of another array in JavaScript
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Vanilla JS
ES2016:
const found = arr1.some(r=> arr2.includes(r))
ES6:
const found = arr1.some(r=> arr2.indexOf(r) >= 0)
How it works
some(..) checks each element of the array against a test function and returns true if any ...
Converting stream of int's to char's in java
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edited May 7 '09 at 23:19
answered May 7 '09 at 9:48
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Simple explanation of clojure protocols
...lojure itself.
Clojure has actually already had Protocols since version 1.0: Seq is a Protocol, for example. But until 1.2, you couldn't write Protocols in Clojure, you had to write them in the host language.
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Angular.js programmatically setting a form field to dirty
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edited Mar 30 '16 at 16:43
Mosh Feu
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C: What is the difference between ++i and i++?
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edited Feb 28 at 10:40
johannchopin
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answ...
Best way to merge two maps and sum the values of same key?
...rt Scalaz._
import Scalaz._
scala> val map1 = Map(1 -> 9 , 2 -> 20)
map1: scala.collection.immutable.Map[Int,Int] = Map(1 -> 9, 2 -> 20)
scala> val map2 = Map(1 -> 100, 3 -> 300)
map2: scala.collection.immutable.Map[Int,Int] = Map(1 -> 100, 3 -> 300)
scala> map1 |...
How to pause a YouTube player when hiding the iframe?
...ementById("popupVid");
var iframe = div.getElementsByTagName("iframe")[0].contentWindow;
div.style.display = state == 'hide' ? 'none' : '';
func = state == 'hide' ? 'pauseVideo' : 'playVideo';
iframe.postMessage('{"event":"command","func":"' + func + '","args":""}', '*');
}
</scri...
How are msys, msys2, and msysgit related to each other?
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answered Jul 29 '14 at 19:40
Ray DonnellyRay Donnelly
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