如何在Immutable.js中设置深层嵌套的值? [英] How can I set a deeply nested value in Immutable.js?

问题描述

使用纯JavaScript对象时，很容易更改深度嵌套的对象属性:

When working with plain JavaScript objects it's easy to change a deeply nested object property:

people.Thomas.nickname = "Mr. T";

但是对于不可变对象，我必须先了解每个属性的祖先，然后才能创建新的人物对象:

But with Immutable I have to go through each property's ancestors before I have a new people object:

var thomas = peopleImmutable.get("Thomas");
var newThomas = thomas.set("nickname", "Mr .T");
peopleImmutable = peopleImmutable.set("Thomas", newThomas);

有没有更优雅的方式来写这个?

Is there a more elegant way to write this?

推荐答案

Immutable中的地图具有 setIn方法使设置深度值变得容易:

Maps in Immutable have a setIn method that makes it easy to set deep values:

peopleImmutable = peopleImmutable.setIn(["Thomas", "nickname"], "Mr. T");

或者，使用split生成数组:

peopleImmutable = peopleImmutable.setIn("Thomas.nickname".split("."), "Mr. T");

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