An alternative syntax for an IIFE is (function() { }()). While the more common syntax is (function() { })(), this alternative places the invocation parentheses inside the outer parentheses. Both approaches accomplish the same thing: turning a function declaration into an expression and then immediately invoking it. The choice between these two syntaxes is largely a matter of personal or team preference. Some developers prefer the first form because it makes it clearer that the function is being invoked immediately after its definition.