Javascript 循环遍历对象并更改所有值
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Looping through an object and changing all values
提问by Dominic
I'm having trouble looping through an object and changing all the values to something else, let's say I want to change all the values to the string "redacted". I need to be able to do this in pure JavaScript.
我在遍历一个对象并将所有值更改为其他值时遇到问题，假设我想将所有值更改为字符串“redacted”。我需要能够在纯 JavaScript 中做到这一点。
For example I'd have an object like this...
例如，我有一个这样的对象......
spy = {
id: 007,
name: "James Bond",
age: 31
};
and the object would look like this after...
然后对象看起来像这样......
spy = {
id: "redacted",
name: "redacted",
age: "redacted"
};
Here is what I have to start with
这是我必须开始的
var superSecret = function(spy){
// Code Here
}
This shouldn't create a new spy object but update it.
这不应该创建一个新的间谍对象，而是更新它。
回答by gurvinder372
try
尝试
var superSecret = function(spy){
Object.keys(spy).forEach(function(key){ spy[key] = "redacted" });
return spy;
}
回答by Sol
You can also go functional.
你也可以去实用。
Using Object.keysis better as you will only go through the object properties and not it's prototype chain.
使用Object.keys更好，因为您只会浏览对象属性而不是它的原型链。
Object.keys(spy).reduce((acc, key) => {acc[key] = 'redacted'; return acc; }, {})
Object.keys(spy).reduce((acc, key) => {acc[key] = 'redacted'; return acc; }, {})
回答by Himanshu Tanwar
var superSecret = function(spy){
for(var key in spy){
if(spy.hasOwnProperty(key)){
//code here
spy[key] = "redacted";
}
}
return spy;
}
回答by Lukas
I wrote a little helper function that walks through an object and applies a callback to each entry:
我编写了一个小辅助函数，它遍历一个对象并将回调应用于每个条目：
iterateEntries(node, fn) {
const newNode = {};
Object.entries(node).forEach(([key, val]) => (newNode[key] = fn(val)));
return newNode;
}
Usage:
用法：
iterateEntries(yourObject, (entry) => {
return entry; // do something with entry here
});
回答by brandonlabs
A nice solution is using a combination of Object.keysand reduce- which doesn't alter the original object;
一个不错的解决方案是使用Object.keys和reduce的组合——它不会改变原始对象；
var superSecret = function(spy){
return Object.keys(spy).reduce(
(attrs, key) => ({
...attrs,
[key]: 'redacted',
}),
{}
);
}
回答by Lgomes_dev
This version is more simple:
这个版本更简单：
Object.keys(spy).forEach(key => {
spy[key] = "redacted");
});
回答by Lgomes_dev
Use a proxy:
使用代理：
function superSecret(spy) {
return new Proxy(spy, { get() { return "redacted"; } });
}
> superSecret(spy).id
< "redacted"
