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cgradwohl/basic_closure2.js

Last active May 3, 2018 21:05
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another basic closure
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basic_closure2.js
var x = "!";
var outer = () => {
var a = "there";
var inner = () => console.log("Hey " + a + x);
return inner;
}
var anotherOuter = outer();
x = "?"; // 'x' is lexically available to outer() and therefore also to anotherOuter().
//therefore it is mutable in the context of anotherOuter().
anotherOuter(); // --> "Hey there?"
console.log(a); // --> ReferenceError: a is not defined
// the function declaration of outer() creates a closure around 'a',
//so it is NOT available in the lexical context of anotherOuter().
// 'a' is truly a private variable!
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