Peter Michaux 讨论了 一对重要的父母.

Peter Michaux discusses the difference in An Important Pair of Parens.

基本上括号是一种约定，表示紧随其后的是立即调用的函数表达式，而不是普通函数.特别是如果函数体很长，这会减少惊喜，

Basically the parentheses are a convention to denote that an immediately invoked function expression is following, not a plain function. Especially if the function body is lengthy, this reduces surprises,