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FxDart 101 › セクション 9 · オブジェクト（Map）関数 › matches

matches

Curried isMatch: bind a pattern once, get back a reusable predicate.

Lecture

isMatch(target, pattern) needs both arguments up front, which makes it awkward to hand to filter, find, every, or anywhere else that wants a single-argument bool Function(A). matches(pattern) closes over the pattern and returns exactly that shape: matches(pattern)(target) == isMatch(target, pattern). Build the predicate once, reuse it across a whole pipeline.

This is FxDart's version of currying for a two-argument function where Dart can't infer a general curry — see the deprecated top-level curry if you're curious why a generic version doesn't exist — but a purpose-built curried form like this one works great.

Demo 1 · Basics

Demo 2 · Dropping straight into filter/find

Try it yourself

Exercise: use matches to build a predicate for {'active': true} and filter users with it.