Javascript 如何在 Immutable.js 中设置深度嵌套的值？
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How can I set a deeply nested value in Immutable.js?
提问by Matt Zeunert
When working with plain JavaScript objects it's easy to change a deeply nested object property:
使用纯 JavaScript 对象时，很容易更改深度嵌套的对象属性：
people.Thomas.nickname = "Mr. T";
But with Immutable I have to go through each property's ancestors before I have a new people object:
但是对于 Immutable，在我拥有一个新的 people 对象之前，我必须通过每个属性的祖先：
var thomas = peopleImmutable.get("Thomas");
var newThomas = thomas.set("nickname", "Mr .T");
peopleImmutable = peopleImmutable.set("Thomas", newThomas);
Is there a more elegant way to write this?
有没有更优雅的方式来写这个？
回答by Matt Zeunert
Maps in Immutable have a setIn methodthat makes it easy to set deep values:
Immutable 中的Map有一个setIn 方法，可以轻松设置深层值：
peopleImmutable = peopleImmutable.setIn(["Thomas", "nickname"], "Mr. T");
Or, using splitto generate the array:
或者，split用于生成数组：
peopleImmutable = peopleImmutable.setIn("Thomas.nickname".split("."), "Mr. T");
