callback hell

9.6

A situation where too many nested callbacks make code hard to read and change

noun

Jargon

: infierno de callbacks

The introduction of promises and async functions was meant to solve the problem of callback hell.

Examples

Our team spent hours refactoring the old callback hell into more maintainable code.
The introduction of promises and async functions was meant to solve the problem of callback hell.
Many JavaScript developers have encountered callback hell when dealing with asynchronous operations.
Dealing with callback hell can be frustrating for developers.
Many new programmers encounter callback hell when starting with JavaScript.
Many JavaScript developers have encountered callback hell when dealing with asynchronous operations.
Our team spent hours refactoring the old callback hell into more maintainable code.

How Complex

spaghetti code

Jargon

1 7.2

callback hell

Jargon

9.6

callback

Specialized

2 4.6

program line

Specialized

4.1

Surface Forms

callback hell singular

callback hells plural

Morphology

callback + hell

If a learner knows 'callback' as an asynchronous function invoked later and 'hell' as a metaphor for an extremely bad or painful situation, they can readily infer that 'callback hell' refers to a very bad/problematic situation caused by callbacks (i.e. deeply nested, hard-to-read callbacks). The construction follows a productive English pattern (X + hell = a dreadful X-situation) that is semantically compositional and cross-linguistically recognizable, so the meaning is transparent to learners who know the parts.

Etymology

The term callback hell comes from a clear image: many callbacks, small pieces of code that run after something else, are placed inside one another like a deep, confusing tunnel, and the word hell shows how stuck and upset a programmer feels. That's why the phrase means 'code that is messy and hard to read or change'.