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davidpaulhunt/immediately-invoked-function-expressions.js

Created February 19, 2021 15:30
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Node.js Design Patterns - Log Rocket inspired notes
Raw
immediately-invoked-function-expressions.js
// simulate static variable
// auto incrementing id generator
const idGen = (() => {
let id = 0;
return () => {
id++;
return id;
};
})();
const id1 = idGen(); // 1
const id2 = idGen(); // 2
idGen();
idGen();
const id4 = idGen(); // 5
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