Mono just() vs defer() vs create() in Reactive Programming

Date: 2025-01-15

This article explores Project Reactor's Mono in reactive programming, focusing on just(), defer(), and create() methods. Mono.just() emits a pre-defined value immediately, ideal for constants. Mono.defer() creates a new Mono per subscriber, delaying value generation until subscription, suitable for dynamic values. Mono.create() offers maximum control, allowing programmatic value emission or error handling, useful for integrating non-reactive code. Choosing the right method optimizes reactive application efficiency.

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