使用ES6 spread + Object.assign:

array = [{key: 'a', value: 'b', redundant: 'aaa'}, {key: 'x', value: 'y', redundant: 'zzz'}]

const hash = Object.assign({}, ...array.map(s => ({[s.key]: s.value})));

console.log(hash) // {a: b, x: y}

如果你想转换到新的ES6地图，请这样做:

var kvArray = [['key1', 'value1'], ['key2', 'value2']];
var myMap = new Map(kvArray);

为什么要使用这种类型的地图?这取决于你。看看这个。

使用lodash，这可以使用keyBy:

var arr = [
    { key: 'foo', val: 'bar' },
    { key: 'hello', val: 'world' }
];

var result = _.keyBy(arr, o => o.key);

console.log(result);
// Object {foo: Object, hello: Object}

使用ES6 Map(非常支持)，你可以尝试这样做:

Var arr = [ {key: 'foo'， val: 'bar'}， {key: 'hello'， val: 'world'} ]; var result = new Map(arr。Map (i => [i。键,i.val])); //当使用TypeScript时，需要指定type: // var result = arr.map((i): [string, string] => [i]。键,i.val]) //不幸的是，映射字符串化不好。这是数组形式的内容。 console.log("Result is: " + JSON.stringify([…Result])); // Map {"foo" => "bar"， "hello" => "world"}

你可以使用Array.prototype.reduce()和实际的JavaScript Map来代替JavaScript对象。

let keyValueObjArray = [
  { key: 'key1', val: 'val1' },
  { key: 'key2', val: 'val2' },
  { key: 'key3', val: 'val3' }
];

let keyValueMap = keyValueObjArray.reduce((mapAccumulator, obj) => {
  // either one of the following syntax works
  // mapAccumulator[obj.key] = obj.val;
  mapAccumulator.set(obj.key, obj.val);

  return mapAccumulator;
}, new Map());

console.log(keyValueMap);
console.log(keyValueMap.size);

Map和Object之间有什么不同? 以前，在Map在JavaScript中实现之前，Object一直被用作Map，因为它们的结构相似。 根据你的用例，如果你需要有有序的键，需要访问映射的大小，或者需要频繁地从映射中添加和删除，map是更可取的。

引用自MDN文档: 对象与map类似，它们都允许您将键设置为值、检索这些值、删除键以及检测是否在键处存储了某些内容。正因为如此(也因为没有内置的替代品)，对象在历史上一直被用作地图;然而，在某些情况下使用Map有一些重要的区别:

The keys of an Object are Strings and Symbols, whereas they can be any value for a Map, including functions, objects, and any primitive. The keys in Map are ordered while keys added to object are not. Thus, when iterating over it, a Map object returns keys in order of insertion. You can get the size of a Map easily with the size property, while the number of properties in an Object must be determined manually. A Map is an iterable and can thus be directly iterated, whereas iterating over an Object requires obtaining its keys in some fashion and iterating over them. An Object has a prototype, so there are default keys in the map that could collide with your keys if you're not careful. As of ES5 this can be bypassed by using map = Object.create(null), but this is seldom done. A Map may perform better in scenarios involving frequent addition and removal of key pairs.

对我来说，我不喜欢使用任何map或reduce，只坚持简单的For循环。

const array = [
   {key: 'a', value: 'b', redundant: 'aaa'},
   {key: 'x', value: 'y', redundant: 'zzz'}
]

const hash = {};

for (const item of array) {
    hash[item.key] = item;
}

console.log(hash);