ES6 immediately invoked arrow function

by

You need to make it a function expression instead of function definition which doesn’t need a name and makes it a valid JavaScript.

(() => {
  console.log('Ok');
})();

Is the equivalent of IIFE

(function() {
   console.log('Ok');
})();

And the possible reason why this works in Node.js but not in Chrome, is because its parser interprets it as a self-executing function, as this

function() { console.log('hello'); }();

works fine in Node.js. This is a function expression, and Chrome, Firefox, and most browsers interpret it this way. You need to invoke it manually.

The most widely accepted way to tell the parser to expect a function expression is just to wrap it in parens, because in JavaScript, parens can’t contain statements. At this point, when the parser encounters the function keyword, it knows to parse it as a function expression and not a function declaration.

Regarding the parametrized version, this will work.

((n) => {
  console.log('Ok');
})()

More Related Contents:

  1. Displaying Javascript variables in HTML
  2. Writing to files in Node.js
  3. What is this JavaScript “require”?
  4. Curly Brackets in Arrow Functions
  5. Issue in returning data retrieved from DB queries called in the loop
  6. How to run Gulp tasks sequentially one after the other
  7. Failed to load c++ bson extension
  8. How to stop babel from transpiling ‘this’ to ‘undefined’ (and inserting “use strict”)
  9. Converting a Buffer into a ReadableStream in Node.js
  10. How to send a message to a particular client with socket.io
  11. node.js async/await using with MySQL
  12. Nodejs express and promises not doing what I expect
  13. javascript node.js next()
  14. What is the proper way to use the node.js postgresql module?
  15. How to get response from S3 getObject in Node.js?
  16. Accessing EJS variable in Javascript logic
  17. Good beginners tutorial to socket.io? [closed]
  18. Using node.js’s File System functions from a browser
  19. Fix the upstream dependency conflict installing NPM packages
  20. Discord.js v13 code breaks when upgrading to v14
  21. nodemon command is not recognized in terminal for node js server
  22. How do I properly insert multiple rows into PG with node-postgres?
  23. Is it okay to use babel-node in production
  24. TypeError: Converting circular structure to JSON in nodejs
  25. Update all clients using Socket.io?
  26. require(‘babel/register’) doesn’t work
  27. Node.js: When to use Promises vs Callbacks
  28. ReadFile in Base64 Nodejs
  29. ECMA6 generators: yield promise
  30. Node.js console.log(object) prints empty object

Leave a Comment