I’ve spent a bit of time fooling with javascript this past weekend. It really is okay, but I came across a few scoping gotcha. Scoping defaults to global, so

function fnc1() { a = 5; } fnc1(); alert("a: "+a);

Will show you that a is 5. I’m more used to languages that default to a local scope. To get variables into a local scope in javascript, this example should be written as:

b = null; function fnc2() { var b = 5; } fnc2(); alert("b: "+b);

Will show you that b is null – as expected.

This entry was posted on Tuesday, September 18th, 2007 at 12:05 pm and is filed under javascript, languages. You can follow any responses to this entry through the RSS 2.0 feed. Both comments and pings are currently closed.