How to Use Named Parameters in JavaScript

JavaScript, by default, does not support named parameters. However, you can do something similar using object literals and destructuring. You can avoid errors when calling the function without any arguments by assigning the object to the empty object, {}, even if you have default values set up.

function example({ arg1 = 1, arg2 = 2, arg3 = 3 } = {}) {
  return { arg1, arg2, arg3 };
}

function problem({failure = true}) {
  return failure;
}

problem(); //TypeError: Cannot read property 'failure' of undefined

example({ arg2: 4, arg1: 2 }); // { arg1: 2, arg2: 4, arg3: 3 }

example(); // { arg1: 1, arg2: 2, arg3: 3 }

---

More Fundamentals Tutorials

• How to Use JavaScript's `Promise.allSettled()` Function
• How to Sort an Array by Date in JavaScript
• How to Trim Characters from a String in JavaScript
• How to Compare Dates Without Time in JavaScript
• Using `map()` on JavaScript Enums
• How to Print An Enum's Properties in JavaScript
• How to Reverse a String in JavaScript