Callbacks are still widely used in JavaScript. The "callback pyramid of doom" was horrible and we're all glad that it's sorted out through Promises and Async/Aw

Callbacks are still widely used in JavaScript. The "callback pyramid of doom" was horrible and we're all glad that it's sorted out through Promises and Async/Await, but functions as first-class language members remains one of the best features of JavaScript, and if a dev is not passing around functions somewhat frequently I would really question their credentials as a "modern" JS developer. Callbacks remain some of the best and most elegant solutions to a range of problems that are not at all uncommon.