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}

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.

这对于Array.prototype.reduce来说是相当简单的:

Var arr = [ {key: 'foo'， val: 'bar'}， {key: 'hello'， val: 'world'} ]; Var结果= arr。Reduce(函数(map, obj) { 地图(obj。Key] = obj.val; 返回地图; }, {}); console.log(结果); // {foo:'bar'， hello:'world'}

注意:Array.prototype.reduce()是IE9+，所以如果你需要支持旧的浏览器，你需要对它进行填充。

以下是我在javascript中创建的一个小片段，将对象数组转换为哈希映射，由对象的属性值索引。您可以提供一个函数来动态计算散列映射的键(运行时)。

function isFunction(func){
    return Object.prototype.toString.call(func) === '[object Function]';
}

/**
 * This function converts an array to hash map
 * @param {String | function} key describes the key to be evaluated in each object to use as key for hasmap
 * @returns Object
 * @Example 
 *      [{id:123, name:'naveen'}, {id:345, name:"kumar"}].toHashMap("id")
        Returns :- Object {123: Object, 345: Object}

        [{id:123, name:'naveen'}, {id:345, name:"kumar"}].toHashMap(function(obj){return obj.id+1})
        Returns :- Object {124: Object, 346: Object}
 */
Array.prototype.toHashMap = function(key){
    var _hashMap = {}, getKey = isFunction(key)?key: function(_obj){return _obj[key];};
    this.forEach(function (obj){
        _hashMap[getKey(obj)] = obj;
    });
    return _hashMap;
};

你可以在这里找到要点:https://gist.github.com/naveen-ithappu/c7cd5026f6002131c1fa

lodash:

const items = [
    { key: 'foo', value: 'bar' },
    { key: 'hello', value: 'world' }
];

const map = _.fromPairs(items.map(item => [item.key, item.val]));

// OR: if you want to index the whole item by key:
// const map = _.fromPairs(items.map(item => [item.key, item]));

lodash fromPairs函数让我想起了Python中的zip函数

链接到lodash

try

let toHashMap = (a,f) => a.reduce((a,c)=> (a[f(c)]=c,a),{});

让arr = ( {id: 123,名字:“弄”}, {id: 345,名字:“kumar”} ]; 让fkey = o => o.id;//函数将对象更改为字符串(key) 让toHashMap = (f) = > a.reduce ((a、c) = > ((f (c)) = c, a), {}); console.log(toHashMap(arr,fkey)); //不推荐添加到原型: // // Array.prototype.toHashMap = function(f){返回toHashMap(this,f)}; // console.log(arr.toHashMap(fkey));