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Get #Amazon #Prime for this #holiday #amazonprime #christmas #2019

on December 11, 2018 Amazon

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Check out #AmazonEcho #Alexa

on August 13, 2018

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I have got an Amazon Echo and was testing with its music playing function.

Check them out :)

Jun

Alexa Amazon Echo Review

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How to upload a zip file to #aws #s3 using #boto3? #python

By Jun - Support me on Amazon

This article has been migrated to Medium.

Click here to view 'How to upload a zip file to AWS S3'.

Thank you for visiting.

How to set up #aws #iot #pubsub using #AwsAmplify sdk?

If you are using aws Amplify library (I use 0.4.8 at the moment) in an Angular project and trying to use PubSub module via aws IoT, you may want to check out this article on how to configure for PubSub module.

There are a few open issues regarding PubSub documentation on Amplify GitHub:
1) Issue 684: Documentation about Pub-Sub Module with AWS IoT
2) Issue 781: AWSIoTProvider not connecting
3) Issue 749: PubSub & IoT Policy: client connection not authorized if using aws_cognito_identity_pool_id

If you follow steps on Amplify PubSub document, according to the above issues, there are some additional steps and a typescript type checking issue (that I encountered):

To check if your front-end does subscribe to an IoT topic, you can
right click > inspect > on browser DevTool, go to Network tab > filter for WS (websockets)
then, you should see a websocket connection like the following:

Issues that I faced:
Issue 1: Argument of type '{ aws_pubsub_region: string; aws_pubsub_e…

#Angular #event listener using Renderer2 and HostListener

What is the list of events that you can attach to your HTML elements? They are basically DOM events. I got the following list of DOM events from MDN.

DOM events on MDN Check out the following list of events on MDN:
abort
beforeinput
blur
click
compositionstart
compositionupdate
compositionend
dblclick
error
focus
focusin
focusout
input
keydown
keypress
keyup
load
mousedown
mouseenter
mouseleave
mousemove
mouseout
mouseover
mouseup
resize
scroll
select
unload
wheel
How to listen for these events? 1) You can then listen for them like so if you use Angular.

<div role='Listbox' (keyup)='handleKeyUpEvent($event)' (keydown)='handleKeyDownEvent($event)'> <span tabIndex='1' (blur)='listBlur()' (click)='listActivated()' (click)='toggleDropDownList()' [ngClass]='titleClasses'>{{title || 'DropDownList'}}</span> <ul role='List' [ngClass]='listClasses'> <li role='Lis…

What meta tags do #Kakaotalk and #Line read for URL preview?

To have your webpages informatively rendered on a Kakaotalk or Line messenger, what meta tags does your website need?
Line FAQ For line, you need to have at least these three tags: og: image, og: title and og: description.
<meta property=”og:image” content=”http://static.naver.jp/line_lp/img/ogp.png”> <meta property=”og:title” content=”LINE : Free Calls & Messages”> <meta property=”og:description” content=”LINE is a new communication app”>
Kakaotalk Forum It was mentioned in Kakaotalk forum thread above that they use FaceBook Open Graph as well.
<head> <title>Kakao Developers</title> <meta property="og:url" content="https://devtalk.kakao.com/"> <meta property="og:title" content="Kakao DevTalk_"> <meta property="og:type" content="website"> <meta property="og:image" content="https://devtalk.kakao.com/images/devtalk_.png"> <meta …

#Algorithm Practice #Leetcode vs #HackerRank vs #GeeksForGeeks

For algorithm practises, I would recommend Leetcode, HackerRank and GeeksForGeeks. There are quite a few other platforms out there which hopefully I can give them a try.
Leetcode
I have been using Leetcode mostly and I think it is awesome for the following reasons:
UI is simple and user-friendly.They show our code runtime relative to other submissions. It supports most of the popular languages.There is a note taking function which comes in handy when you reviewFavorite list functionDifferent text editor themes They upload new questions almost every week and currently have 700+ questions In addition, they have a weekly algorithm contests that users can win some cash and leetcode points.

HackerRank
Recently(2016 to present), I notice that quite many companies use HackerRank for first round coding assessment. It is definitely a good idea to get familiar with the platform and do the algorithm questions they have to offer. I think you should at least get familiar with it if you are applying…

How to #zip all files in a folder using #python subprocess?

By Jun - Support me on Amazon
Issue: I was wondering how I can zip all the files in a folder but without including the directories.
First, I found the two ways listed in resource 1.

> cd folderName > zip -r output.zip
OR > zip -j output.zip folderName/* What does -j flag do? Using -j flag, it will flatten all the directories, what you will see in your zipped folder would be all the files within a parent directory. Zip flags if you run zip command, you can see a list of flags
> zip Copyright (c) 1990-2008 Info-ZIP - Type 'zip "-L"' for software license. Zip 3.0 (July 5th 2008). Usage: zip [-options] [-b path] [-t mmddyyyy] [-n suffixes] [zipfile list] [-xi list] The default action is to add or replace zipfile entries from list, which can include the special name - to compress standard input. If zipfile and list are omitted,…

#Angular 5 HttpClient and #RxJS to query the Movie DB

This is an small tutorial of using Angular 5 HttpClient to query the Movie Database API.
Angular HttpClientTaken from Angular Http documentation:

Most front-end applications communicate with backend services over the HTTP protocol. Modern browsers support two different APIs for making HTTP requests: the XMLHttpRequest interface and the fetch() API. The HttpClient in @angular/common/http offers a simplified client HTTP API for Angular applications that rests on the XMLHttpRequest interface exposed by browsers. Additional benefits of HttpClient include testability features, typed request and response objects, request and response interception, Observable apis, and streamlined error handling.

Angular HttpClient1)
To use HttpClient, we need import to HttpClientModule and it is recommended to do it in app.module.ts file like following. Remember to import HttpClientModule after BrowserModule as HttpClient depends on the browser's XMLHttpRequest interface.
import { NgModule } from …

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