Namaste JavaScript — Interview Quick Notes

Ep 21–22: Promises

• A Promise is an object that is a placeholder for a future async value. States: pending → fulfilled or rejected.
• Promise result is immutable once settled — safe to pass around.
• .then attaches a success callback; .catch handles rejection; both return promises enabling chaining.
• Always return a value/promise inside .then to pass data down the chain.
• .catch placed mid-chain only catches errors from above it; code below it still runs.