Arrow Functions

Arrow function expressions were introduced in ES6. These expressions are a clean and concise alternative to the traditional function syntax. The syntax for an arrow function expression does not require the function keyword and uses a fat arrow => to separate the parameter(s) from the body. However, they are limited and can’t be used in all situations.

There are several variations of arrow functions:

  • Arrow functions with a single parameter do not require () around the parameter list.
  • Arrow functions with a single expression can use the concise function body which returns the result of the expression without the return keyword.


Arrow function with no arguments:

const printHello = () => {
// Output: hello

Arrow functions with a single argument:

const checkWeight = (weight) => {
console.log(`Baggage weight: ${weight} kilograms.`);
// Output: Baggage weight: 25 kilograms.

Arrow function with two arguments:

const sum = (firstParam, secondParam) => {
return firstParam + secondParam;
console.log(sum(2, 5));
// Output: 7

Concise arrow functions:

const multiply = (a, b) => a * b;
console.log(multiply(2, 30));
// Output: 60


  • Arrow functions do not have their own bindings to this or super, and should not be used as methods.
  • Arrow functions cannot be used as constructors.
  • Arrow functions cannot use yield, within its body.
  • Arrow functions cannot use the special arguments keyword.
Edit this page on GitHub


Interested in helping build Docs? Read the Contribution Guide or share your feedback.

Learn JavaScript on Codecademy

Edit this page on GitHub