[英]Comparing two arrays of objects and merging
here is my use case: I have two arrays of objects that come from two observables and I have created a combineLatest method to iterate the array into one with mapped Ids: 这是我的用例:我有两个来自两个可观察对象的对象数组,并且创建了一个CombineLatest方法,以将数组迭代为具有映射ID的对象:
var result1 = [{
question: 1,
answerList: [{
answer: 'Sandra',
isDefault: 'true'
},
{
answer: 'John',
isDefault: 'false'
}
]
},
{
question: 2,
answerList: [{
answer: 'Peter',
isDefault: 'false'
},
{
answer: 'Bobby',
isDefault: 'false'
}
]
},
{
question: 3,
answerList: [{
answer: 'Harry',
isDefault: 'false'
},
{
answer: 'Bob',
isDefault: 'false'
}
]
}
]
var result2 = [{
question: 1,
answer: 'John'
},
{
question: 3,
answer: 'Bob'
}
];
My goal is to have another array of objects containing elements like this: 我的目标是拥有另一个包含如下元素的对象数组:
var finalResult = [{
question: 1,
answerList: [{
answer: 'Sandra',
isDefault: 'false'
},
{
answer: 'John',
isDefault: 'true'
}
]
},
{
question: 2,
answerList: [{
answer: 'Peter',
isDefault: 'false'
},
{
answer: 'Bobby',
isDefault: 'false'
}
]
},
{
question: 3,
answerList: [{
answer: 'Harry',
isDefault: 'false'
},
{
answer: 'Bob',
isDefault: 'true'
}
]
}
]
You could use a hash table for faster check of an question with an answer is set. 您可以使用哈希表来更快地检查设置了答案的问题。 Then iterate and update the items according of the object's settings.
然后根据对象的设置迭代和更新项目。
var result1 = [{ question: 1, answerList: [{ answer: 'Sandra', isDefault: 'true' }, { answer: 'John', isDefault: 'false' }] }, { question: 2, answerList: [{ answer: 'Peter', isDefault: 'false' }, { answer: 'Bobby', isDefault: 'false' }] }, { question: 3, answerList: [{ answer: 'Harry', isDefault: 'false' }, { answer: 'Bob', isDefault: 'false' }] }], result2 = [{ question: 1, answer: 'John' }, { question: 3, answer: 'Bob' }], object = result2.reduce((o, { question, answer }) => { (o[question] = o[question] || {})[answer] = true; return o; }, Object.create(null)); result1.forEach(({ question, answerList }) => answerList.forEach(o => o.isDefault = (question in object && o.answer in object[question]).toString() ) ); console.log(result1);
.as-console-wrapper { max-height: 100% !important; top: 0; }
Example code: 示例代码:
let result = result1.map(item => {
let targetItems = result2.filter( item2 => item2.question ===
item.question );
targetItems.forEach(item3 => {
item.answerList.push(item3.answer);
});
return item;
});
console.log(result);
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