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Welcome to the GAC website! GAC members have provided great input on this new resource tool for the past six months. Effective 1 July 2018, this site will be the GAC’s sole web resource for news and information about GAC activities. If you have difficulty finding any current or past GAC information, please email gac-staff@icann.org .

By itself accessing a non-existing property does not throw an error. The real problem appears when trying to get data from a non-existing property value. This is the most common undefined related trap, reflected in the well known error message TypeError: Cannot read property <prop> of undefined .

Let's slightly modify the previous code snippet to illustrate a TypeError throw:

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favoriteMovie does not have the property actors , so favoriteMovie.actors evaluates to undefined . As result, accessing the first item of an undefined value using the expression favoriteMovie.actors[0] throws a TypeError .

The permissive nature of JavaScript that allows to access non-existing properties is a source of confusion: the property may be set, or may be not. The ideal way to bypass this problem is to restrict the object to have always defined the properties that it holds.

Unfortunately you often don't have control over the objects that you work with. Such objects may have different set of properties in diverse scenarios. So you have to handle all these scenarios manually.

Let's implement a function append(array, toAppend) that adds at the beginning and/or at the end of an array new elements. toAppend parameter accepts an object with properties:

The function returns a new array instance, without altering the original array (i.e. it's a ).

The first version of append() , a bit naive, may look like this:

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Because toAppend object can omit first or last properties, it is obligatory to verify whether these properties exist in toAppend .

A property accessor evaluates to undefined if the property does not exist. The first temptation to check weather first or last properties are present is to verify them against undefined . Let's do the verification in conditionals if(toAppend.first){} and if(toAppend.last){} ...

Not so fast. There is a serious drawback in this approach. undefined , as well as false , null , 0 , NaN and '' are YDN Women Retro Low Heels Mules Closed Toe Slip On Loafer Shoes Flat Slide Sandals Red 9TbVPte
values.

In the current implementation of append() , the function doesn't allow to insert falsy elements:

Try in repl.it

0 and false are falsy. Because if(toAppend.first){} and if(toAppend.last){} actually compare against falsy, these elements are not inserted into the array. The function returns the initial array [10] without modifications.

The tips that follow explain how to correctly check the property existence.

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Global Commission on the Stability of Cyberspace

Promoting stability in cyberspace to build peace and prosperity

Global Commission Proposes Definition of the Public Core of the Internet

In November 2017, the Global Commission

In November 2017, the Global Commission on the Stability of Cyberspace (GCSC)

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GCSC Issue Brief 2: Briefing and Memos from the Research Advisory Group

The briefing and memos included in

The briefing and memos included in this issue were developed by independent

Read More

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On Tuesday, 17 July, during IETF

On Tuesday, 17 July, during IETF 102 in Montreal, theGlobal Commission on

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We have reached the end of a twenty-five-year period of strategic stability and relative peace among major powers. Conflict between states will take new forms, and cyber-activities are likely to play a leading role in this newly volatile environment, thereby increasing the risk of undermining the peaceful use of cyberspace to facilitate the economic growth and the expansion of individual freedoms.

In order to counter these developments, the Global Commission on the Stability of Cyberspace will develop proposals for norms and policies to enhance international security and stability and guide responsible state and non-state behavior in cyberspace. The GCSC will engage the full range of stakeholders to develop shared understandings, and its work will advance cyber stability by supporting information exchange and capacity building, basic research, and advocacy.

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At its fourth meeting in November 2017 in New Delhi, the Global Commission on the Stability of Cyberspace (GCSC) issued a “ Icebug Womens Metro BUGrip Studded Traction Winter Boot Nubuck Coffee 43LOrxDR8
“ with the following norm urging all Internet stakeholders to safeguard the general availability and integrity of the Internet:

The GCSC welcomes feedback on this norm, both in terms of wording as well as possible levers for implementation via Gola Mens Harrier Fashion Sneaker Navy/Sun/Red RoJsaZB
or cyber@hcss.nl .

Read more…

“Without prejudice to their rights and obligations, state and non-state actors should not conduct or knowingly allow activity that intentionally and substantially damages the general availability or integrity of the public core of the Internet, and therefore the stability of cyberspace.”

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Dec 20, 2016

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, I also took STAT 210A, Theoretical Statistics. Here’s a description of the class from the Berkeley Statistics Graduate Student Association (SGSA):

All of the core courses require a large commitment of time, particularly with the homework. Taking more than two of them per semester (eight units) is a Herculean task.

210A contains essential material for the understanding of statistics. 210B contains more specialized material. The 210 courses are less mathematically rigorous than the 205 courses. 210A is easier than 205A; 210B is very difficult conceptually, though in practice it’s easy to perform adequately. Homework is time-consuming.

210A: The frequentist approach to statistics with comparison to Bayesian and decision theory alternatives, estimation, model assessment, testing, confidence regions, some asymptotic theory.

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we get the following description:

Stat 210A is Berkeley’s introductory Ph.D.-level course on theoretical statistics. It is a fast-paced and demanding course intended to prepare students for research careers in statistics.

Both of these descriptions are highly accurate. I saw these before the semester, so I was already prepared to spend many hours on this course. Now that it’s over, I think I spent about 20 hours a week on it. I thought this was a lot of time, but judging from the SGSA, maybe even the statistics PhD students have to dedicate lots of time to this course?

Our instructor was Professor William Fithian, who is currently in his second year as a statistics faculty member. This course is the first of two theoretical statistics courses offered each year aimed at statistics PhD students. However, I am not even sure if statistics PhD students were in the majority for our class. At the start of the semester, Professor Fithian asked us which fields we were studying, and a lot of people raised their hands when he asked “EECS”. Other departments represented in 210A included mathematics and engineering fields. Professor Fithian also asked if there was anyone studying the humanities or social sciences, but it looks like there were no such students. I wouldn’t expect any; I don’t know why 210A would be remotely useful for them. Maybe I can see a case for a statistically-minded political science student, but it seems like 215A and 215B would be far superior choices.

The number of students wasn’t too large, at least compared to the crowd-fest that’s drowning the EECS department. Right now I see 41 students listed on the bCourses website, and this is generally accurate since the students who drop classes usually drop bCourses as well.

It’s important to realize that even though some descriptions of this course say “introduction” (e.g., see Professor Fithian’s comments above), any student who majored in statistics for undergrad, or who studied various related concepts (computer science and mathematics, for instance) will have encountered the material in 210A before at some level. In my opinion, a succinct description of this course’s purpose is probably: “provide a broad review of statistical concepts but with lots of mathematical rigor , while filling in any minor gaps.”

There are so many reasons you should be using UGC in your marketing — both because it is simply more effective, and because it can help stretch your marketing budget. Here’s the lowdown:

Every brand has its own story, and promises something to its target audience. However, people tend to take branded messages with a grain of salt, wary that companies want their business. When people see that other consumers are confirming your brand message through UGC, it acts as a second opinion reinforcing how your brand delivers on its promises.

For example, Chinese Laundry Kristin Cavallari Womens Mikah Espadrille Wedge Sandal Black Leather y0C4GU6
is a marketing tool that promises to help you find the most shared content for any given topic as well as the key influencers who share it.

For someone who hasn’t used it before, you might wonder if this tool really works as well as they say. Buzzsumo, however, is one tool that gets a lot of, well, “buzz” in various marketing blogs (such as this one from Sprout Social ), sourcing it as the tool for finding influencers and distributing content. This kind of third-party user-generated content is social proof that Buzzsumo is effective and worth using.

Because UGC is produced by individuals who don’t have anything to gain by singing your praises, it is perceived as being more authentic and more trustworthy. In fact, it’s been found to be Boombah Mens Squadron Turf Shoes 20 Color Options Multiple Sizes Black/Orange/White n6peQ8q
than branded content alone.

In addition to commissioned and stock photography, user-generated content is a whole new source of visuals you can tap into for your marketing. The best part? There is a ton of visual UGC out there about your brand (especially if you’re in the B2C world).

The fact is that people love sharing photos and videos on social media. And now that pretty much every person online has a smartphone, snapping up a pic and uploading it to social media is as easy as pie. Consider this:

All that adds up to a lot of potential for user-generated content, and not to mention a huge reach. In fact, experts predict that this year, Aisun Womens Cute Faux Fur Lined Dressy Elevator High Heel Booties Platform Round Toe Hidden Wedge Ankle Boots With Zipper Red bPjK0Cxqnh
will be taken.

Tapping into this growing pool of visuals can dramatically increase the number of visuals you have available to use and get creative with. What’s more, for the most part, as long as you credit the original user, most will be happy to give you rights to their content without extra cost.

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