从嵌套函数内部访问IIFE变量

Question

I have an IIFE with a nested function inside. There is a word variable both inside and outside the nested function. How can I access the word variable outside the nested function instead of the inside one?

Code:

 (function (){ let word = "Hello"; function sayHello(){ let word = "Greetings"; console.log(word + " Everyone!"); // This is using the inside word variable instead of the outside one. How can I specify JS to use the outside one instead? } sayHello(); })(); 

Answer 1

Pass the outer variable as a parameter so you can reference it separately from the inside variable:

 (function() { let word = "Hello"; function sayHello(outerWord) { let word = "Greetings"; console.log(outerWord + " Everyone!"); } sayHello(word); })(); 

Alternatively, simply give the variables different names, if you're allowed - shadowing is usually a bad idea for exactly this reason.