Enforce required parameters
Written byPhuoc Nguyen
Created
24 Feb, 2021
Category
Trick
Tags
JavaScript
In ES6, the default value of a parameter is evaluated if the parameter is missing. It allows us to enfore that a given parameter is required.
js
const required = () => {
throw new Error('Missing parameter');
};
const getAges = (yearOfBirth = required()) => new Date().getFullYear() - yearOfBirth;Calling
`getAges()` without parameter will throw the exception `Missing parameter`.
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Phước Nguyễn