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/*
* Apex doesn't expose dependent picklist info directly, but it's possible to expose.
* Approach:
*  * Schema.PicklistEntry doesn't expose validFor tokens, but they are there, and can be accessed by serializing to JSON
*    (and then for convenience, deserializing back into an Apex POJO)
*  * validFor tokens are converted from base64 representations (e.g. gAAA) to binary (100000000000000000000)
*    each character corresponds to 6 bits, determined by normal base64 encoding rules.
*  * The binary bits correspond to controlling values that are active - e.g. in the example above, this dependent option
*    is available for the first controlling field only.
* 

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[{
		"code": "DEL",
		"lat": "28.5603",
		"lon": "77.1027",
		"name": "Indira Gandhi International Airport",
		"city": "New Delhi",
		"state": "Madhya Pradesh",
		"country": "India"
	},
	{

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import CoreTelephony

let info: CTTelephonyNetworkInfo = CTTelephonyNetworkInfo()
guard let carrier: CTCarrier = info.subscriberCellularProvider else {
  // No carrier info available
  return
}

print(carrier.carrierName)
print(carrier.mobileCountryCode)

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Django Deployment to Ubuntu 18.04

In this guide I will go through all the steps to create a VPS, secure it and deploy a Django application. This is a summarized document from this digital ocean doc

Any commands with "$" at the beginning run on your local machine and any "#" run when logged into the server

Create A Digital Ocean Droplet

Use this link and get $10 free. Just select the $5 plan unless this a production app.

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Remove MySQL completely

1. Open the Terminal

2. Use mysqldump to backup your databases

3. Check for MySQL processes with: ps -ax | grep mysql

4. Stop and kill any MySQL processes

5. Analyze MySQL on HomeBrew:

brew remove mysql

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import Foundation
import SystemConfiguration.CaptiveNetwork

func getWiFiSsid() -> String? {
    var ssid: String?
    if let interfaces = CNCopySupportedInterfaces() as NSArray? {
        for interface in interfaces {
            if let interfaceInfo = CNCopyCurrentNetworkInfo(interface as! CFString) as NSDictionary? {
                ssid = interfaceInfo[kCNNetworkInfoKeySSID as String] as? String
                break

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Download Udemy course videos using youtube-dl

$ youtube-dl --list-extractors | grep udemy

Steps

1. Get link to the course to download. e.g. https://www.udemy.com/course-name/
2. Login into udemy website, save the cookie from chrome using Chrome (Cookie.txt)[1] export extension. Save it to file udemy-cookies.txt
3. Get the link of the video that you want to download. usually in format. Use the command provided below where you have to replace the {course_link} and {path_to_cookies_file} with respective paths.

# $ youtube-dl {course_link} --cookies {path_to_cookies_file}