Flatten an array of objects containing key\values

问题

Say I have the follow array of objects storing a single key\value pair:

var someArray = [
    {foo: 1},
    {bar: 2}
];

I would like to flatten this array into a single object, where each key from the original objects become a property of the new single object like so:

someObject = {
    foo: 1,
    bar: 2
}

I will always have unique keys, and only ever one key\value pairing.

I know if I loop over the array in a foreach, then I can only access the index and value of the item, e.g.

0: {foo: 1}

I want to be able to loop over, and when accessing the item read the key and value separately so I can append onto my new object.

I feel like lodash should be able to help here, but I'm struggling to find whic of their methods could help.

Can someone point me in the right direction?

Thanks

回答1:

You could iterate and use Object.assign to get a new object with all properties.

var someArray = [{ foo: 1 }, { bar: 2 }],
    result = someArray.reduce(function (r, a) {
        return Object.assign(r, a);
    }, {});

console.log(result);

回答2:

No need for lodash here you can just use Object.assign() and spread syntax.

var someArray = [
  {foo: 1},
  {bar: 2}
];
var obj = Object.assign({}, ...someArray)
console.log(obj)

You can also use apply instead of spread syntax

var obj = Object.assign.apply({}, someArray)

var someArray = [
  {foo: 1},
  {bar: 2}
];
var obj = Object.assign.apply({}, someArray)
console.log(obj)

回答3:

This can be done quickly using reduce and Object assign:

var someArray = [
    {foo: 1},
    {bar: 2}
];
var result = someArray.reduce((acc, obj) => Object.assign(acc, obj), {})
console.log(result)

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

来源：https://stackoverflow.com/questions/42068529/flatten-an-array-of-objects-containing-key-values

标签

javascript

arrays

lodash

javascript-objects

key-value