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This is a guest post by moderator Alex J. If you see him in the forums, say hello!
When do you need a semicolon? Here's a handy cheat sheet...
The semicolon is only obligatory when you have two or more statements on the same line:
var i = 0; i++ // <-- semicolon obligatory
// (but optional before newline)
var i = 0 // <-- semicolon optional
i++ // <-- semicolon optional
The semicolon in JavaScript is used to separate statements, but it can be omitted if the statement is followed by a line break (or there’s only one statement in a {block}). A statement is a piece of code that tells the computer to do something. Here are the most common types of statements:
var i; // variable declaration
i = 5; // value assignment
i = i + 1; // value assignment
i++; // same as above
var x = 9; // declaration & assignment
var fun = function() {...}; // var decl., assignmt, and func. defin.
alert("hi"); // function call
All of these statements can end with a ; but none of them must. Some consider it a good habit to terminate each statement with a ; – that makes your code a little easier to parse, and to compress: if you remove line breaks you needn't worry about several statements ending up unseparated on the same line.
1. After a closing curly bracket
You shouldn’t put a semicolon after a closing curly bracket }. The only exceptions are assignment statements, such as var obj = {};, see above.
// NO semicolons after }:
if (...) {...} else {...}
for (...) {...}
while (...) {...}
// BUT:
do {...} while (...);
// function statement:
function (arg) { /*do this*/ } // NO semicolon after }
2. After the round bracket of an if, for, while or switch statement
It won't harm to put a semicolon after the { } of an if statement (it will be ignored, and you might see a warning that it's unnecessary). But a semicolon where it doesn't belong (such as after the round (brackets) of an if, for, while, or switch statement) is a very bad idea:
if (0 === 1); { alert("hi") }
// equivalent to:
if (0 === 1) /*do nothing*/ ;
alert ("hi");
This code will alert "hi", but not because 0 equals 1, but because of the semicolon. It makes JavaScript think that you have an empty statement there, and everything to the right of it is treated as no longer belonging to the if conditional and thus independent of it.
An important quirk: inside the () of a for loop, semicolons only go after the first and second statement, never after the third:
for (var i=0; i < 10; i++) {/*actions*/} // correct
for (var i=0; i < 10; i++;) {/*actions*/} // SyntaxError
The JavaScript syntax proofing tool JSLint, which is built into the Codecademy code editor, does a pretty good job of finding unnecessary semicolons – or missing ones.
It'll show you yellow warning triangles in code lines. Hovering the mouse over a triangle will tell you if there's a missing semicolon or an unnecessary one. You can generally trust those warnings until you develop an intuition of where to use semicolons and where not to.
]]>Conditional comments are gone in IE 10. That's good. IE 10 is a very good browser. Feature detection is a better way to go in nearly all cases. But what if you find some styling situation where you absolutely need to target IE 10? I guess you'll have to do this.
Rogie posted a really simple idea a while back that should still work great for this. Add the User Agent to the <html> element with a tiny bit of JavaScript:
var doc = document.documentElement;
doc.setAttribute('data-useragent', navigator.userAgent);IE 10's User Agent string is:
Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)Which will result in:
<html data-useragent="Mozilla/5.0 (compatible; MSIE 10.0; Windows NT 6.2; Trident/6.0)">And you can then style like:
html[data-useragent*='MSIE 10.0'] h1 {
color: blue;
}Check out this Pen!
IE 10 Specific Styles is a post from CSS-Tricks
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An unlisted video is a different type of private video. "Unlisted" means that only people who know the link to the video can view it (such as friends or family to whom you send the link). An unlisted video will not appear in any of YouTube's public spaces (such as search results, your channel, or the Browse page). An unlisted video is different to a private video in these ways:
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iTunes U at UMBC provides the University with a supplemental way to widely distribute digital lectures, music, performances and more that convey the academic and intellectual opportunities at UMBC.
Users must have Apple's free iTunes software installed to access the video and audio files
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Only Camtasia Relay admins can grant access to the Camtasia Relay server? Presenters cannot be admins and vice versa.
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For UMBC employees, AD grants access to department computer workstations, printers, and shared network resources. Active Directory is a collective term for Microsoft's integrated set of directory services. Most significantly, Active Directory provides a central, search-able information repository (allowing simple sharing of network resource information), while acting as the central authority for network security.
All network resources are represented in Active Directory as objects and each object can be assigned certain attributes, which characterize the object. For example, a user object in Active Directory can have attributes such as First Name, Last Name, Phone Number etc.
Google Calendar is the calendering and scheduling software used at UMBC. Calendar allows faculty, staff and students to maintain personal agendas, schedule meetings with each other on an invitational basis, and schedule resources (such as meeting rooms).
The list service runs on the lists.umbc.edu server and includes the following features: 1) built-in archiving, 2) automatic bounce processing, 3) spam filtering, 4) content filtering, and 5) digest delivery.
myUMBC portal is a web "supersite" with a collection of links to popular web services at UMBC. A kind of "doorway" into the University. The site provides a variety of services including course registration, directories, online shopping, discussion groups, Web searching, channels (small windows within a page that are dynamically updated and determined by the user) and links to other sites.
Grants access to computer labs, file storage, personal website publishing and more.
Blackboard is a Web-based course-management system designed to allow students and faculty to participate in classes delivered online or use online materials and activities to complement face-to-face teaching. Blackboard enables instructors to provide students with course materials, discussion boards, virtual chat, online quizzes, an academic resource center, and more. The degree to which Blackboard is used in a course varies. For example, instructors may supplement an on-campus class by putting their syllabus and handouts on their course sites. In contrast, other courses may be conducted entirely through Blackboard, without any on-campus sessions. If you’re enrolled in a course that uses Blackboard, be sure to find out how Blackboard will be used in that course.
DoIT provides incoming and outgoing gateways for the passage of email to and from the University. Incoming gateways deliver to DoIT supported mail servers, from which users read their email, and also deliver to some departmental systems which support their own users. The gateways perform virus checking and spam email assessment. High spam scores are used to discard messages before delivery to user inbox servers; intermediate scores can be used to tag them for filtering according to user selected rules.
There are two systems for handling email at the University which are managed by DoIT. The new one is G-mail or Google email which is used for all new accounts that have their mail delivered to DoIT managed systems and a legacy Unix (Cyrus) service which is used for a all accounts prior to August, 2010.
It manages access and storage of mail messages according to accepted internet standards, allowing users to access their mail with almost any standards-compliant mail program including Webmail, Pine, Outlook, Thunderbird, or Apple Mail.
Google Apps is a package of online applications that makes communicating and collaborating at UMBC easier and more efficient. The cornerstone of Google Apps is Gmail, Google’s web-based email program, which integrates with Google Docs, for creating and sharing documents, and Google Calendar, for coordinating schedules. All of these services are hosted online, so email, documents, and calendars are always accessible from any computer, anywhere.
The Google contract was signed by the attorney general’s office in July 2010 under the Maryland Education Enterprise Consortium (MEEC) umbrella. UMBC was the first USM school to sign the new contract thus allowing UMBC to offer the Google collaborative tools to the UMBC community.
myUMBC is a personalized student web portal that your student will create and customize to their specific interests. Your student will need to create a myUMBC portal account not only to register to visit campus and apply, but also to take care of their business throughout the admission process. myUMBC will add your student to our mailing list and deliver personalized academic information; it’s the only place to register for campus visit events, and track their admissions status throughout the process.
UMBC's Residential Network (ResNet) provides access to information resources, including computer networks and computer equipment to students living in the residence halls. Appropriate use of computing resources should always be legal and ethical, reflect academic honesty, uphold community standards, and prevent the over-consumption of shared resources such as network bandwidth. Appropriate use should demonstrate respect for intellectual property, ownership of data, system security mechanisms, and individual's right to privacy and to freedom from intimidation and harassment.
Secure remote access to campus computing resources including Library journals.
Customers who use this can access the network from an average of up to 150 feet, or 50 meters, away from a wireless hub without cables or connectors. These radio frequencies pass through most building materials, allowing network access outdoors.
Wireless is a supplement to regular connections but is not a replacement. Although wireless is often convenient, physical connections are still faster, more secure, and more reliable.
The Financial database consists of general ledger, accounts payable, purchasing and reports. The PeopleSoft HRMS system consists of human resources and payroll. In order to obtain access to the various financial and HR applications, you must have a myUMBC account and be granted access to the application.
Research computing accounts provide access to the high performance computing platforms and software that DoIT maintains and are meant to be used for computation- and memory-intensive computing jobs.
Resource 25, or simply R25, is a campus-wide event and class scheduling system. R25 will assist the computing community by streamlining the way we schedule events and reserve spaces on campus. It also fosters more efficient use of space and simplify space planning processes across campus.
Student Administration (SA) is the corporate system that will be used to manage the student academic life cycle from application through to award.