SNSD & Super Junior - Seoul Song

Prior to JavaScript 1.2, function definition was allowed only in toplevel global code but JavaScript 1.2 allows function definitions to be nested within other functions as well.

Still there is a restriction that function definitions may not appear within loops or conditionals. These restrictions on function definitions apply only to function declarations with the function statement.

As we'll discuss later in next chapter, function literals (another feature introduced in JavaScript 1.2) may appear within any JavaScript expression, which means that they can appear within if and other statements.