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

props

Returns the values of several keys in a Map, as a List.

Lecture

props is prop applied to several keys at once, in order: give it a list of keys and a map, and get back a List<V?> with one slot per requested key. Unlike pick, a missing key does not get dropped from the result — it becomes null in that position, so the output List always has the same length as propKeys. That positional guarantee is what makes it pair so well with Dart's list-destructuring pattern.

Demo 1 · Basics

Demo 2 · Destructuring the result

Try it yourself

Exercise: use props to pull ['first', 'last'] out of row as a List.