[英]How do I loop through Javascript object checking key and values?
I have a Javascript object:我有一个 Javascript object:
const mapping = {
'Mind Management': {
type: 'average',
linked_topics: ['Digital Detox', 'Small Scaling', 'Simplexity'],
edge: 'Zeroed Out'
},
'Ancient Wisdom': {
type: 'direct',
edge: 'Roots Revival'
}
};
I want to iterate through this object and check if the key
or the linked_topics
(if present) of the object matches a string value.我想遍历这个 object 并检查 object 的
key
或linked_topics
(如果存在)是否与字符串值匹配。
const stringToBeMatched = 'Simplexity'
Code that I tried:我试过的代码:
for (var key in mapping) {
if(key === stringToBeMatched || mapping[key].linked_topics.includes(stringToBeMatched) ) {
console.log(`found ${stringToBeMatched} in ${key}`);
}
}
I'm getting the following eslint error with this:我收到以下 eslint 错误:
ESLint: for..in loops iterate over the entire prototype chain, which is virtually never what you want. Use Object.{keys,values,entries}, and iterate over the resulting array.(no-restricted-syntax)
How can this be fixed?如何解决这个问题? Is there any better way to achieve this without using for..in?
有没有更好的方法可以在不使用 for..in 的情况下实现这一目标?
You can get only the keys using Object.keys您只能使用Object.keys获取密钥
const keys = Object.keys(mapping);
keys.forEach((key) => {
if(key === stringToBeMatched || mapping[key].linked_topics.includes(stringToBeMatched) ) {
console.log(`found ${stringToBeMatched} in ${key}`);
}
})
Use entries as suggested by ESLint.使用 ESLint 建议的条目。 I used
?.
我用过
?.
instead of .
而不是
.
after "linked_topics" property to prevent Cannot read properties of undefined (reading 'includes')
error when no property exists named linked_topics.在“linked_topics”属性之后,以防止在不存在名为linked_topics的属性时
Cannot read properties of undefined (reading 'includes')
错误。
const stringToBeMatched = 'Simplexity'
Object.entries(mapping).forEach(([key, value]) => {
if(key === stringToBeMatched || value.linked_topics?.includes(stringToBeMatched) ) {
console.log(`found ${stringToBeMatched} in ${key}`);
}
})
Good answer from @doctorgu, you could also you some . @doctorgu 的好答案,你也可以。
const string = 'Simplexity' const mapping = { 'Mind Management': { type: 'average', linked_topics: ['Digital Detox', 'Small Scaling', 'Simplexity'], edge: 'Zeroed Out' }, 'Ancient Wisdom': { type: 'direct', edge: 'Roots Revival' } } const isStringInMapping = Object.entries(mapping).some(([key, value]) => ( key == string || value.linked_topics?.includes(string) )) console.log(isStringInMapping)
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