rachelwritingcode

How to Eyeball Your ‘This’ Context in Javascript

The early programmer struggles with the Javascript keyword this. But understanding your this context is easier than it seems.

This is all about where a function is invoked. Often, early programmers worry about where the function was declared. Perhaps the function was declared in a specific file or a particular object. Surely this changes it's this!

Nope.

To understand this, we need to see where it is invoked. Nothing else matters, with one exception which we'll cover in a moment.

rachelwritingcode

package ca.rwang.connectthree;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

rachelwritingcode

package a3;

import java.awt.EventQueue;

import javax.swing.JFrame;
import javax.swing.JTextPane;

import java.awt.BorderLayout;

import javax.swing.JPanel;

rachelwritingcode

Column "Movie Title" format a35;

select "Movie Title"
from  (select tm.MovieTitle as "Movie Title",
              count(tad.MovieID) as "Total Awards"
        from tblMovie tm 
              inner join tblAwardDetail tad on tm.MovieID = tad.MovieID 
        where tad.AwardResultID = '1' 
        group by tm.MovieTitle
        order by "Total Awards" desc) 

rachelwritingcode

Column "Writers Name" format a25;

select tw.WriterFName||' '||tw.WriterLName as "Writers Name"
    from tblWriter tw
        left outer join tblWriterDetail twd on tw.WriterID = twd.WriterID
    where twd.MovieID is null
    order by tw.WriterID;
/*
Writers Name
-------------------------

rachelwritingcode

column "Movie" format a30;

select distinct tm.MovieTitle as "Movie"
from tblKeyword tk
	inner join (tblKeywordDetail tkd 
		inner join tblMovie tm on tm.MovieID = tkd.MovieID )
	on tkd.KeywordID = tk.KeywordID
where tk.KeywordDesc Like '%France%' OR 
	  tk.KeywordDesc Like '%Pizza%' OR 
	  tk.KeywordDesc Like '%Waitress%'

rachelwritingcode

PAUSE Press [RETURN] to see Question 1;
/* 1 */

column "Movie" format a25;

select MovieTitle as "Movie"
from tblMovie
where DirectorID is null;

PAUSE Press [RETURN] to see Question 2 ;

rachelwritingcode

import RPi.GPIO as GPIO
import time
import os

GPIO.setwarnings(False)
# Set the layout for the pin declaration
GPIO.setmode(GPIO.BOARD)
# The pin 11 is the out pin for the PWM signal for the servo.
GPIO.setup(11, GPIO.OUT)

rachelwritingcode

# Import GPIO Library
import time
import RPi.GPIO as GPIO
GPIO.setmode(GPIO.BCM)

# Define GPIO pins being used
GPIO_TRIGGER = 18 
GPIO_ECHO = 25  

#Trig will send out a short burst of sound waves

rachelwritingcode

#import the GPIO Library
import RPi.GPIO as GPIO
import time
# blinking function

def blink(pin):
#Setting the LED to turn on 
	GPIO.output(pin,GPIO.HIGH)
	time.sleep(1)
	#Setting the LED to turn off