JavaScript Promises solve callback nesting

Short summary

Promises solve JavaScript's callback nesting problem (the 'Pyramid of Doom') by allowing you to chain asynchronous operations in flat, readable code. Each promise has three states: pending (waiting), fulfilled (success), or rejected (error). Use .then() to handle success and .catch() to handle errors globally for much cleaner, more maintainable code.

• •Promises flatten deeply-nested callback chains into readable sequential code
• •Each promise has three immutable states: pending, fulfilled (with value), or rejected (with error)
• •.then() and .catch() handlers enable centralized error handling and cleaner async patterns

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