you don apos t know your keywords

... It's important to note that setTimeout( ) doesn't put your callback on the event loop queue What it does is set up a timer;when the timer expires, the environment places your callback into the event loop, such that some future tick will pick it upand execute it ... So, contemplate this: can you even really trust utilities that you do theoretically control (in your own code base)? Think of it this way: most of us agree that at least to some extent we should build our own internal functions with somedefensive checks on the input parameters, to reduce/prevent unexpected issues ... We call this "inversion of control," when you take part of your program and give over control of its execution to another thirdparty There's an unspoken "contract" that exists between your code and the third-party utility a set of things you expect

Ngày tải lên: 22/11/2016, 17:55

... Prototype Methods Object Object.is( ) Static Function Object.getOwnPropertySymbols( ) Static Function Table of Contents | v Object.setPrototypeOf( ) Static Function Object.assign( ) Static Function ... understanding by exposing you to the new and unknown The intention is to evolve your knowledge in step with your tools by bestowing you with new capabilities It exists to give you the confidence to ... limitations of run length Meta? So TCO is cool, right? But what does any of this have to with meta programming? Great question You’re totally right to ask that! Short answer: I’m stretching the

Ngày tải lên: 22/11/2016, 17:55

... environments “But”, you say, “no one wants to write ugly code like that!” That’s true No one writes (some of) the code output by the CoffeeScript compiler, either That’s not the point The point is that ... mirrors the approach many people take in function scoping when they manually move/hoist all their var declarations to the top of the function The let statement puts them there at the top of the block ... block by intent, and if you don’t use let declarations strewn throughout, your block-scoping declarations are somewhat easier to identify and maintain But, there’s a problem The let statement form

Ngày tải lên: 22/11/2016, 17:55

... on Twitter: http://twitter.com/oreillymedia Watch us on YouTube: http://www.youtube.com/oreillymedia Check out the full You Don’t Know JS series: http://YouDont KnowJS.com Trang 15CHAPTER 1this ... call-site. What’s important is to think about the call-stack (the stack of functions that have been called to get us to the current moment in execution) The call-site we care about is in the invocation ... clocks that told the time in thestatus bar Suffice it to say, I didn’t really pay much attention to Java‐Script in the early part of my career because of the novelty of the im‐plementations that I

Ngày tải lên: 22/11/2016, 17:55

... as compliance-test that it does what you expect? And what if that test fails—should your code just refuse to run? // don't trust Array.prototype.push (function(){ if (Array.prototype.push) { var ... if guard, and it did so in an incompatible way, that would have broken the site at that time What that highlights is an interesting question that, frankly, doesn’t get enough attention from JS ... absolutely sure your code is the only code that will ever run in that environment If you can’t say that 100%, then extending the natives is dangerous You must weigh the risks Next, don’t unconditionally

Ngày tải lên: 22/11/2016, 17:56

... without just tossing out code to copy v Trang 8and paste When you strive to comprehend your code, you createbetter work and become better at what you do The code isn’t justyour job anymore, it’s ... How did that feel? Probably slightly intimidating and maybe a little bit frustrating, right? At onepoint, we all did not know the things that we know now, and that’stotally OK; we all start somewhere ... write that yield the same series of 0s and1s The choices you make about how to write your program matter Trang 27—not only to you, but to your other team members and even toyour future self.You should

Ngày tải lên: 22/11/2016, 17:56

... Trang 1Unit 4Thursday, June 18 th , 2009 UNIT 4 Trang 2 Trung tâm ngoại ngữ Trang 2Unit 4 Let’s Talk What’s wrong, Andy ? I can’t find my book . Is it in your bedroom ? I don’t know. Bạn/ ... 24Unit 4 Trang 25Unit 4 Can you ?Trang 26 Trung tâm ngoại ngữ Trang 26Trang 27Unit 4Can you read? The d og and the fr og are on the l og St op the t op It is by the m op It is f un in the s ... sao thế? Tôi/ con không thể tìm thấy quyển sách của con Trang 3Unit 4Oh, here it is. It’s under my bed Thanks, Mom! Trang 4 Trung tâm ngoại ngữ Trang 4Trang 5Unit 4 Let’s SingWhat’s wrong? What’s

Ngày tải lên: 24/04/2021, 10:15

... lần Sự thất vọng bắt nguồn từ diễn dịch trực nghĩa this​ (​this.count++​) Khi ​foo.count = 0​ thực thi, thực chất thêm thuộc tính count​ vào hàm ​foo​ Nhưng với this.count​tham chiếu hàm, ​this​không ... nhập input text cách nhấp “OK”, bạn tuân theo giá trị mà bạn gõ lưu biến age​, mà output​ với console.log( )​: You Don’t Know JS: this & Nguyên mẫu đối tượng — Chương 1: this That? Một chế hãi ... muốn, count​ mà thêm nào?" Thực tế, đào sâu thêm, bạn thấy vơ tình bạn tạo biến tồn cục count​ (xem Chương để biết xảy nào), có giá trị NaN​ Tất nhiên, bạn nhận thấy kết đặc biệt này, câu ta có câu

Ngày tải lên: 15/03/2023, 16:15

... ALIGN="CENTER"> <TD>Dilbert</TD> <TD>no</TD> <TD>yes</TD> </TR> <TR VALIGN="TOP" ALIGN="CENTER"> <TD>Foxtrot</TD> <TD>no</TD> ... <TD>no</TD> <TD>no</TD> </TR> <TR VALIGN="TOP" ALIGN="CENTER"> <TD>Grand Avenue</TD> <TD>yes</TD> <TD> yes</TD> ... <CAPTION>Cartoons</CAPTION> <TR VALIGN="TOP" ALIGN="CENTER"> <TH>Toon</TH> <TH>Download</TH> <TH>Archive</TH> </TR> <TR VALIGN="TOP"

Ngày tải lên: 13/08/2014, 22:21

... When you visit domain Get or set the cookie’s domain path Get or set the cookie’s path expires Get or set the cookie’s expiry time Note that the method returns the date and time string for the ... destroy information. You thus have a slight dilemma—you need to set a time long enough that a genuine user could take a short break or interruption without it expiring, but short enough that it ... components See the table for a list of the supported methods and the information returned Note that these are generic methods—if called without any arguments, they return the cookie data; if supplied

Ngày tải lên: 13/08/2014, 22:21

... Apache You control the access of your directories through Apache in two stages The first is that you must have configured the directory structure within the main httpd.conf file to ensure that an ... authorization Configuring Apache To get the mod_perl module to start executing your scripts, you need to rather than starting an external process There are two ways to do so The first is to introduce ... a file without giving him or her direct access to it through the Web server To use the script, copy it to your server and then supply the script with the location of the file you want to download

Ngày tải lên: 13/08/2014, 22:21

... floor trader this is the most efficient method of trading Don't try to day trade the S&P's Do not buy a system; you are better off developing your own Do not try to pick tops and bottoms ... There's an old saying in trading -If you don't control your risk they'll carry you out Many traders starting out emphasize trade entry and to a limited extent trade exit, but do not devote ... but to exit prior to the excessive volatility that often accompanies market extremes Neal: Thanks Cy, for taking the time to do this interview Neal: If you look at the various steps in trading,

Ngày tải lên: 01/11/2014, 00:04

... there an alternative tothese two approaches? Is there a way to make “the multipotentialite thing”work? That is the central question of this book In the chapters to come, we’llmeet multipotentialites ... unknown, namely the sentiment: if you’ve never donesomething, then you probably should not attempt it Intellectual curiosity is a staple of multipotentiality, so it’s rare to find amultipotentialite ... lives better in your own unique way Whatever yourdestinies are, you can’t step into them while stifling your multipotentiality.You must embrace it and use it Trang 21expression “jack-of-all-trades,

Ngày tải lên: 12/05/2018, 16:55

... exultingly “Yes, that’s the best of it—the next best of it It was your betting that was the best of all—the best thing you ever did since we married, except your coming here.” “It’s in time to help you, too—with your own money, isn’t it?” ... honest anger “You not dare to tell me you destroyed my letter without reading it—that you destroyed all that letter contained simply because you no longer cared for your wife; because you wanted to be rid of her, wanted to vanish and never see her any more, and so go ... or reasoning left “Well, that’s the way to get into your old man’s heart, Mona To think of that! I call it tact divine Everything has spun my way at last I was right about that Derby, after all It was in my bones that I’d make a pot out of it,

Ngày tải lên: 12/03/2020, 12:17

... groups told him that despite the fact that the TA had virtually wiped out graffiti on the trains, about 20 percent of the respondents said it was still there Things had gotten so bad, people didn t ... tourists a year.31 The objective, following Kelling, is an attempt to prevent deterioration to the point that higher crime rates will almost surely follow As he puts it, it is an attempt that ... offers a historical perspective on the utility of the “root causes” argument, noting: The meliorists of the Nineteenth Century took it for granted that by a century after their time—by the year...

Ngày tải lên: 05/03/2014, 20:20

... Even after you ve created your nonprofit, most states require nonprofits to file periodic reports or statements with the secretary of state or the department of state There is often a corporations ... sure to note in your recreated minutes that they were created after the fact to memorialize actions taken by your initial board or incorporators at their first meeting Membership Roster If your ... eight people, but you couldn t set it at four people, or below the statutory minimum Often, nonprofits simply restate the state law requirements in their bylaws That way, they know that if they...

Ngày tải lên: 18/04/2014, 14:09

... other patterns for better places to store state besides the function object But for just a moment, we’ll explore that pattern, to illustrate how this doesn t let a function get a reference to ... tools to get the call-stack, then find the second item from the top, and that will show you the real call-site Nothing but Rules We turn our attention now to how the call-site determines where this ... it whatever you want Whatever you call the variable, the easiest way to set it up as totally empty is Object.create(null) (see Chapter 5) Object.cre ate(null) is similar to { }, but without the...

Ngày tải lên: 01/08/2014, 15:57