为对象内的键分配一个布尔值

Question

我试图提出一种方法来遍历值数组，将每个值另存为键，并为每个键分配一个“ true”布尔值。目标是创建以下对象：{  "arrayValue" : true,  "anotherArrayValue" : true,  "arrayValueAsWell" : true}我在做：  var objectToCreate = {};  let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"]  let myArrayConverted = myArray.forEach((prop,index) => objectToCreate[prop] = true)并得到：  {    0 : "arrayValue",    1 : "anotherArrayValue",    2 : "arrayValueAsWell"  }

Answer 1

在返回的值forEach()是undefined。您还应该使用赋值（=）运算符将值分配给对象键：

var objectToCreate = {};

let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"];

myArray.forEach(prop => objectToCreate[prop] = true);

console.log(objectToCreate);

Answer 2

您可以使用Array.prototype.reduce以下键来创建对象：

const myObject = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"]

  .reduce((acc, value) => ({ ...acc, [value]: true }), {});

console.log(myObject);

Answer 3

您可以映射对象并将它们全部分配给一个对象 Object.assign

var array = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"],

    object = Object.assign(...array.map(k => ({ [k]: true })));

console.log(object);

Answer 4

您可以迭代数组并分配给objectToCreate，如下所示：

  var objectToCreate = {};

  let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"];

  myArray.forEach(key => objectToCreate[key] = true)';