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In the new 6th edition, there is an option to use DOIs when referencing journal articles, and amendments to the section covering quotations.
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Any in-text reference should include the authorship and the year of the work. Depending on the nature of the sentence/paragraph that is being written, references to sources may be cited in the text as described below: Additional support on how to introduce such references is available from Student Support in their Sperry TopSider Womens Firefish Cross Hatch Canvas Boat Shoe Tan m8OWfOI
When writing for a professional publication, it is good practice to make reference to other relevant published work. This view has been supported by Cormack (1994).
Cormack (1994, pp.32-33) states that "when writing for a professional readership, writers invariably make reference to already published works". According to Cormack (1994, pp.32-33), writers should be encouraged to reference published research when addressing professional readership.
During the mid-twenties research undertaken in professional publishing (Cormack, 1994) showed that...
Making reference to published work appears to be characteristic of writing for a professional audience (Cormack, 1994).
Smith (1946) and Jones (1948) have both shown ...
White and Brown (2004) in their recent research paper found...
Recent research (White and Brown, 2004) suggests that...
During the mid nineties research undertaken in Luton (Slater and Jones, 1996) showed that...
Further research (Green, Harris and Dunne, 1969) showed
et al. and others
Green, et al. (1995) found that the majority ...
Recent research (Green, et al., 1995) has found that the majority of ...
Further research in the late forties (Smith, 1946; Jones, 1948) led to major developments...... Recent research (Collins, 1998; Brown, 2001; Davies, 2008) shows that
as suggested by Patel (1992; 1994) who found that...
research in the nineties (Patel, 1992; 1994) found that...
Earlier research by Dunn (1993a) found that...but later research suggested again by Dunn (1993b) that ...
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Smith, J., 1975. A source of information. In: W. Jones, ed. 2000. . Oxford: Oxford University Press. Ch.2
first citing

That One Optional Property

Sometimes you need to modify your view controller to do a new thing. One thing leads to another, and you find yourself adding an optional variable property to the view controller, which will be set in some cases and not in others.

I think that more often than not, this is a flawed approach. There are a few reasons for this. First, a class with a optional property that is only used sometimes has a weak sense of identity. Put another way, adding optional properties blurs Delicious Womens Message Faux Nubuck Leather Lace Up Cutout Chunky Heels Cognag 5RAozN
. Second, this optional property doesn’t carry any semantic meaning. What does it mean about the state of this object if the type is nil? A casual reader of your code can’t tell in what cases the property will be nil, or what ramifications it has for the object. Third, code will continue to mutate. One optional property becomes two optional properties, which becomes three, and before you know it, you’ll end up at the bottom of a slippery slope. If we want to express that this value must exist if that value is nil, we can’t do that with simple optionals.

In all the codebases I’ve seen, I’ve found two primary reasons why you might need an optional property on your view controller. I’ll explore them both and suggest better patterns to solve each problem.

The first reason that you might have a problematic optional property is when you won’t necessarily have that object or piece of data every time this view controller is used.

One example of this that came up recently was a view controller that was being presented from a push notification in some cases. It needed to show a specific message that came from that notification. The simplest solution to this problem was to add an optional string property:

Other code in the view controller switched on the message’s existence to determine which views to allocate, how to lay them out, and so on. The optionality of the property represents more than existence of a simple string. It had implications in the rest of the view controller and the rest of the view layer.

The more essential point here is that the string now no longer represents a string that might be there or might not — it now represents the presentation style or mode that the view controller is in. Was it created in the context of a push notification or through normal browsing? The answer is in this barely related property!

To fix this problem, we have to make this mode fully explicit. Once it’s a first class citizen in this view controller, its effect on the view controller will be much more obvious.

As Sandi Metz says, Stetson 8841 Brown Laser Wings on Shaft Laser Wingtip 95 D Medium b0gJS79P
. With an optional property, a sometimes-I-do-it-this-way, the code doesn’t admit that the nil case of this property carries meaning as well and is really its own specialization. With an enum, this is reified and formalized in code.


Table of Contents

CCIE Routing Switching

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» CCIE Routing Switching

In this tutorial we will take a look at IP unnumbered and how to configure it. First of all…what is IP unnumbered and why do we need it?

On a router each interface requires a unique IP address so it can install an entry in the routing table and process IP packets. IP unnumbered allows you to process IP packets without configuring a unique IP address on an interface, this works by “borrowing” an IP address from another interface.

Why would you want this and not just configure an IP address on the interface? To answer that question we have to dive into the past.

Once upon a time we didn’t have VLSM (Variable Length Subnet Mask) and we used classful routing protocols like RIP version 1 and IGRP (the predecessor of EIGRP). This means that the smallest subnet you could use was a /24. When using public IP addresses this is a huge waste of IP space. Take a look at the picture below:

There are 3 routers connected with each other using point-to-point serial links. We have to use two /24 subnets while we only require 4 IP addresses in total…such a waste!

IP unnumbered was created to solve this problem so you didn’t have to waste entire subnets on point-to-point interfaces. It borrows an IP address from another interface so you don’t have to configure one on the point-to-point interface.

Nowadays we can use VLSM to create /30 subnets so we don’t have to waste many IP addresses. We can also use private range IP addresses (if possible in your network) so we don’t need ip unnumbered as much as in the past. Still it can be useful if you quickly want to setup a point-to-point link without worrying about IP addresses and finding a suitable subnet.

Does this make sense so far? Let’s check out the configuration of IP unnumbered. Here’s a simple example with one router:

Here’s how to configure IP unnumbered:

interface FastEthernet 0/0 ip address interface Serial 0/0/0 ip unnumbered FastEthernet 0/0

The serial interface will borrow the IP address of the FastEthernet interface. Both interfaces will use the same IP address as the same time and will function 100%. We can verify this by using the show ip interface brief command:

Above you can see that both interfaces are using the same IP address. The serial 0/0/0 interface that is borrowing the IP address is called the “unnumbered interface”.

The interface that you are borrowing the IP address from should be up and running, if not you can’t borrow the IP address. For this reason it’s best to borrow an IP address from a loopback interface. A loopback interface doesn’t go down unless you use the shutdown command or your router crashes…

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