behavior

Why does this work in Ruby: "foo" "bar" # => "foobar" I'm unsure as to why the strings were concatenated instead of a syntax error being given. I'm curious as to whether or not this is expected behavior and whether or not it's something the parser is responsible for wrangling (two strings without operators is considered a single string) or the language definition itself is specifying this behavior (implicit concat). Implementation details can be found in parse.y file in Ruby source code. Specifically, here . A Ruby string is either a tCHAR (e.g. ?q ), a string1 (e.g. "q", 'q', or %q{q}), or a

In a plain HTML document &pound (dec 163) renders as £ without needing the ; , whereas &oelig (dec 339) will only render a œ with the semicolon. It seems that every html entity with a decimal value under 255 will render without needing the semicolon, both in FireFox and Chrome. What gives? The reason is that historically the semicolon has been optional when an entity reference (or a character reference) is not immediately followed by a name character. So &pound? is OK since ? is not a name character (i.e., a character allowed in names), but &pound4 is not, since 4 is a name character, making

In WinForms, to set focus to a specific control, I always seem to wind up calling Control.Select() and Control.Focus() to get it to work. What is the difference, and is this the correct approach? Focus is a low-level method intended primarily for custom control authors. Instead, application programmers should use the Select method or the ActiveControl property for child controls, or the Activate method for forms. http://msdn.microsoft.com/en-us/library/system.windows.forms.control.focus.aspx Focus() is the low level function that actually sets the focus. Select() is a higer-level method. It

A coworker showed me this: He has a DropDownList and a button on a web page. Here's the code behind: protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { ListItem item = new ListItem("1"); item.Attributes.Add("title", "A"); ListItem item2 = new ListItem("2"); item2.Attributes.Add("title", "B"); DropDownList1.Items.AddRange(new[] {item, item2}); string s = DropDownList1.Items[0].Attributes["title"]; } } protected void Button1_Click(object sender, EventArgs e) { DropDownList1.Visible = !DropDownList1.Visible; } On the page load, the items' tooltips are showing, but on the