过滤器数组，获取列表
过滤器数组，获取列表
提问于 2020-01-09 02:55:24
我有一个这样的数组：
["q1":[{"key_api":86,"question_api":"q1","answer_api":"a1"},{"key_api":87,"question_api":"q1","answer_api":"a2"},{"key_api":88,"question_api":"q1","answer_api":"a3"},{"key_api":89,"question_api":"q1","answer_api":"a4"}],
"q2":[{"key_api":90,"question_api":"q2","answer_api":"a5"},{"key_api":91,"question_api":"q2","answer_api":"a7"}{"key_api":92,"question_api":"q2","answer_api":"a9"}],
"q3":[{"key_api":93,"question_api":"q3","answer_api":"a1"},{"key_api":94,"question_api":"q3","answer_api":"a2"},{"key_api":95,"question_api":"q3","answer_api":"a3"},{"key_api":96,"question_api":"q3","answer_api":"a4"}],
"q4":[{"key_api":97,"question_api":"q4","answer_api":"a10"},{"key_api":98,"question_api":"q4","answer_api":"a11"},{"key_api":99,"question_api":"q4","answer_api":"a12"},{"key_api":100,"question_api":"q4","answer_api":"a13"}]]另外，我还有这个字符串：
"q4"我想过滤数组，获得这个列表(实际上，第三个问题的可能答案)：
["a10", "a11", "a12", "a13"]如果可能的话，我更喜欢原生js (但如果它涉及大量代码，我可以考虑使用库)。我使用js已经有一周了:像这样的操作在Python中感觉很自然，但在这里我遇到了麻烦。非常感谢!
Stack Overflow用户
发布于 2020-01-09 02:59:09
假设您提供的初始JSON实际上是一个由数组属性组成的对象(因为JSON数组不能有属性)，您只需在对象的一个属性上使用Array.prototype.map：
const dataObject = {
"q1": [{ "key_api": 86, "question_api": "q1", "answer_api": "a1" }, { "key_api": 87, "question_api": "q1", "answer_api": "a2" }, { "key_api": 88, "question_api": "q1", "answer_api": "a3" }, { "key_api": 89, "question_api": "q1", "answer_api": "a4" }],
"q2": [{ "key_api": 90, "question_api": "q2", "answer_api": "a5" }, { "key_api": 91, "question_api": "q2", "answer_api": "a7" }, { "key_api": 92, "question_api": "q2", "answer_api": "a9" }],
"q3": [{ "key_api": 93, "question_api": "q3", "answer_api": "a1" }, { "key_api": 94, "question_api": "q3", "answer_api": "a2" }, { "key_api": 95, "question_api": "q3", "answer_api": "a3" }, { "key_api": 96, "question_api": "q3", "answer_api": "a4" }],
"q4": [{ "key_api": 97, "question_api": "q4", "answer_api": "a10" }, { "key_api": 98, "question_api": "q4", "answer_api": "a11" }, { "key_api": 99, "question_api": "q4", "answer_api": "a12" }, { "key_api": 100, "question_api": "q4", "answer_api": "a13" }]
};
console.log(dataObject['q4'].map(item => item.answer_api));
如果您想对对象中的所有条目/键执行此操作，则可以通过迭代返回值将其与Object.keys结合使用，如下所示：
const dataObject = {
"q1": [{ "key_api": 86, "question_api": "q1", "answer_api": "a1" }, { "key_api": 87, "question_api": "q1", "answer_api": "a2" }, { "key_api": 88, "question_api": "q1", "answer_api": "a3" }, { "key_api": 89, "question_api": "q1", "answer_api": "a4" }],
"q2": [{ "key_api": 90, "question_api": "q2", "answer_api": "a5" }, { "key_api": 91, "question_api": "q2", "answer_api": "a7" }, { "key_api": 92, "question_api": "q2", "answer_api": "a9" }],
"q3": [{ "key_api": 93, "question_api": "q3", "answer_api": "a1" }, { "key_api": 94, "question_api": "q3", "answer_api": "a2" }, { "key_api": 95, "question_api": "q3", "answer_api": "a3" }, { "key_api": 96, "question_api": "q3", "answer_api": "a4" }],
"q4": [{ "key_api": 97, "question_api": "q4", "answer_api": "a10" }, { "key_api": 98, "question_api": "q4", "answer_api": "a11" }, { "key_api": 99, "question_api": "q4", "answer_api": "a12" }, { "key_api": 100, "question_api": "q4", "answer_api": "a13" }]
};
Object.keys(dataObject).forEach(key => {
console.log(dataObject[key].map(item => item.answer_api));
})
页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/59652186
复制相关文章
相似问题
腾讯云开发者
