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Test for existence of nested JavaScript object key
...ed property getting needs.
_.get(countries, 'greece.sparta.playwright')
https://lodash.com/docs#get
Previous answer
lodash users may enjoy lodash.contrib which has a couple methods that mitigate this problem.
getPath
Signature: _.getPath(obj:Object, ks:String|Array)
Gets the value at any d...
In log4j, does checking isDebugEnabled before logging improve performance?
...ava 8, you don't have to use isDebugEnabled() to improve the performance.
https://logging.apache.org/log4j/2.0/manual/api.html#Java_8_lambda_support_for_lazy_logging
import java.util.logging.Logger;
...
Logger.getLogger("hello").info(() -> "Hello " + name);
...
Django migration strategy for renaming a model and relationship fields
...ting data showed up, all the other tables referenced Bar fine.
from here: https://hanmir.wordpress.com/2012/08/30/rename-model-django-south-migration/
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How to Store Historical Data
...
Change data capture: https://docs.microsoft.com/en-us/sql/relational-databases/track-changes/about-change-data-capture-sql-server?view=sql-server-2017
It is supported in SQL Server 2008 R2, it might have been supported in SQL Server 2008.
...
App Inventor 2 UrsPahoMqttClient 拓展 - 物联网轻量级MQTT协议 · App Inventor 2 中文网
...计的轻量级协议，基于TCP协议实现。
MQTT 协议文档：https://mqtt.org/
虽然 App Inventor 有现成的 MQTT 扩展，但它们需要额外的 JavaScript 或外部配置文件。此处介绍的 MQTT 客户端组件完全独立工作，不需要任何外部元素。...
Build Eclipse Java Project from Command Line
...everal years ago eclipse replaced startup.jar with the "equinox launcher"
https://wiki.eclipse.org/Equinox_Launcher
On Eclipse Mars (MacOX):
java -jar /Applications/Eclipse.app/Contents/Eclipse/plugins/org.eclipse.equinox.launcher_1.3.100.v20150511-1540.jar -noSplash -data "workspace" -applicatio...
Make a div fill the height of the remaining screen space
... on each property for an up-to-date compatibility status.
(taken from https://developer.mozilla.org/en-US/docs/Web/Guide/CSS/Flexible_boxes)
All major browsers and IE11+ support Flexbox. For IE 10 or older, you can use the FlexieJS shim.
To check current support you can also see here:
http:/...
How to get UTC time in Python?
...eUploader: {
brandingHtml: "Powered by \u003ca href=\"https://imgur.com/\"\u003e\u003csvg class=\"svg-icon\" width=\"50\" height=\"18\" viewBox=\"0 0 50 18\" fill=\"none\" xmlns=\"http://www.w3.org/2000/svg\"\u003e\u003cpath d=\"M46.1709 9.17788C46.1709 8.26454 46.2665 7.94324 4...
Need to handle uncaught exception and send log file
...ug information to your backend, or to Google Docs document you've set up.
https://github.com/ACRA/acra
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How to use ng-repeat without an html element
...g unnecessary tags:
<html>
<head>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.23/angular.min.js"></script>
<script>
angular.module('mApp', []);
</script>
</head>
<body ng-app="mApp">
<tab...