javascript - JavaScript：如何重命名对象中的所有键（在第一级处理所有键）？ [重复](JavaScript: how to rename all keys in an object (process all keys on the first level)? [duplicate])

Question

This question already has an answer here:

(这个问题已经在这里有了答案：)

• What's the quickest way to rename all property names in a Javascript object?

  (重命名Javascript对象中所有属性名称的最快方法是什么？)

  3 answers

  (3个答案)

I would like to add a prefix to the first level of keys in an object.

(我想在对象的第一级键中添加前缀。)

To leave less ambiguity, I hope that it's OK to show how a dictionary comprehension in Python is an elegant way for achieving this (and I am looking for an analogous approach in JavaScript):

(为了减少歧义，我希望可以显示Python中的字典理解是实现此目的的一种优雅方法（我正在寻找JavaScript中的类似方法）：)

>>> old = {"a": 1, "b": 2}
>>> prefix = "_"
>>> new = {prefix + key: value for key, value in old.items()}
>>> new
{'_a': 1, '_b': 2}

What's a similarly elegant and especially readable way for doing this in modern JavaScript, ideally available in NodeJS 12?

(在现代JavaScript中，这是一种类似的优雅且特别易读的方式，理想的方式是在NodeJS 12中使用吗？)

  ask by Jan-Philip Gehrcke translate from so

Answer 1

Convert the object to entries via Object.entries() .

(通过Object.entries()将对象转换为条目。)

Iterate the entries with Array.map() and update the key.

(使用Array.map()迭代条目并更新密钥。)

Convert the entries to object using Object.fromEntries() :

(使用Object.fromEntries()将条目转换为对象：)

 const old = {"a": 1, "b": 2} const prefix = "_" const result = Object.fromEntries( Object.entries(old).map(([k, v]) => [`${prefix}${k}`, v]) ) console.log(result)