JSFiddle - React, Tailwind, and code Playground

by Mathias Bynens

JavaScript

var options; $.extend(options, { foo: 1, bar: 2 }); console.log(options); // undefined

var options; options = $.extend(options, { foo: 1, bar: 2 }); console.log(options); // { foo: 1, bar: 2 }

var options; $.extend(options || {}, { foo: 1, bar: 2 }); console.log(options);