Javascript-不使用删除操作删除对象键 [英] Javascript - Removing object key not using delete

问题描述

这可能是重复的问题，但我找不到任何问题.

This might be duplicated question, but I could not find any.

我想删除一个对象的键.

I wanna remove a key of an object.

请先检查我的小提琴.

删除对象的键

delete obj.something;

当您检查控制台时，尽管在第一个console.log之后使用了delete，您仍然可以看到在控制台中打印了相同的对象.

When you check console, you'll be able to see the same object is printed in console in spite of using delete after first console.log.

为什么会这样?

删除对象键的最佳方法是什么?

And what is the best idea of remove a key of an object?

谢谢.

推荐答案

您可以使用扩展运算符删除密钥.

you can use spread operators to remove keys.

let obj = {a:1, b:2, c:3}
const {a, ...restObj} = obj; // this will make restObj with deleted a key.

在处理不可变类型时，此方法特别有用.这样，您就不会变异原始对象，而仍然会获得具有已删除键的对象

This method is especially useful when dealing with immutable types. This way you would not mutate the original object and still get an object with deleted key

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