Functional programming tool: Java 8 Function improves assertion efficiency

preface

stayJavaIn the journey of development, we often encounter duplicate code unexpectedly. These repetitive codes not only make the project appear cumbersome, but also increase maintenance costs. Fortunately,Java 8Bringing the spring breeze of functional programmingFunctionA series of new features represented by interfaces provide us with a sharp sword to overcome this challenge.

This article will take a practical application scenario as an example, that is, usingJava 8Using functional programming features to reconstruct data validity assertion logic, demonstrating how to useSFunction(Based onJava 8ofLambdaExpression encapsulation reduces code repetition, thereby enhancing the elegance and maintainability of the code.

Background story: The troubles of data verification

Java 8 introduced the concept of functional interfaces, whereFunction<T, R>It is the most basic representative, accepting a typeTInput, return typeRThe result. And inMyBatis PlusCommonly used in frameworksSFunctionYes, that's rightLambdaThe further encapsulation of expressions allows us to manipulate the properties of entity classes more flexibly.

Practical exercise: Refactoring assertion method

BelowensureColumnValueValidThe method utilizes the charm of functional interfaces to assert the validity of specified column values for any entity class