合并来自两个不同类型数组的对象

Question

imagine that, we have two arrays. Each of the containing objects of different type. For example:

let first: Foo[] = [
    { a: 12, b: 'x', c: 0 },
    { a: 43, b: 'y', c: 0 }
];

let second: number[] = [11, 15];

I would like merge theirs objects in a way that I finally get one array looks like below:

let first: Foo[] = [
    { a: 12, b: 'x', c: 11 },
    { a: 43, b: 'y', c: 15 }
];

As you can see I just want to assign value from the second array to c property of object from first array.

I hope that you understand my explanation of problem. I believe in your skills, guys!

Answer 1

you could zip the two arrays into one,

const first: Foo[] = [
    { a: 12, b: 'x', c: 0 },
    { a: 43, b: 'y', c: 0 }
];

const second: number[] = [11, 15];

const result: Foo[] = first.map((e, i) => {
    return <Foo>Object.assign({}, e, { c: second[i] });
});

Answer 2

As so often, Array.prototype.reduce provides a good base for an approach like eg this one ...

 var listOfItems = [ { a: 12, b: 'x', c: 0 }, { a: 43, b: 'y', c: 0 } ]; var listOfValues = [11, 15]; function reassignValueToGivenKey(collector, item, idx) { item = Object.assign({}, item); // do not mutate original reference. item[collector.key] = collector.valueList[idx]; // reassign value. collector.itemList.push(item); // collect processed items separately. return collector; } var result = listOfItems.reduce(reassignValueToGivenKey, { key: 'c', valueList: listOfValues, itemList: [] }).itemList; console.log('listOfItems : ', listOfItems); console.log('result : ', result);

 .as-console-wrapper { max-height: 100%!important; top: 0; }

Answer 3

I think you should do it like this... Maybe not the best, but should work in you case :) This is very simple...

for(var i in second){
   var elem = second[i];
   first[i]['c'] = elem;
}