如何将值与嵌套数组中的其他对象进行比较？

Question

How do I compare nested array values with an object in the parent and delete the object if they do not match? I need to iterate through the entire array to be left with only "modules" in the child which match the parent "module".

Here is the image of the console to see my array structure.

for (var i = topicArray.length - 1; i >= 0; i--) {
if (topicArray[i].module !== module)
topicArray.splice(i, 1) }

Answer 1

One option is to loop through each item, and simply filter() out the non matching modules:

 const data = [ { module: 'A', topics: [ { topic: 'something', module: 'A' }, { topic: 'something else', module: 'B' } ] }, { module: 'B', topics: [ { topic: 'something', module: 'A' }, { topic: 'something else', module: 'B' } ] } ] data.forEach(item => { item.topics = item.topics.filter(topic => item.module === topic.module) }) console.log(data)