CODEWITHSUNDEEP
javascript
a.tokayeva
a.tokayeva

Reputation: 77

Assign a boolean value to the key inside the object

I am trying to come up with the way to loop through an array of values, save each value as a key and assign a 'true' boolean value for each key.

The goal is to create the following object: 

{
  "arrayValue" : true,
  "anotherArrayValue" : true,
  "arrayValueAsWell" : true
}

I am doing: 

  var objectToCreate = {};

  let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"]
  let myArrayConverted = myArray.forEach((prop,index) => objectToCreate[prop] = true)

and getting: 

  {
    0 : "arrayValue",
    1 : "anotherArrayValue",
    2 : "arrayValueAsWell"
  }

Upvotes: 0

Views: 2830

Answers (4)

Nina Scholz
Nina Scholz

Reputation: 386550

You could map object and assign them all to one object with Object.assign

var array = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"],
    object = Object.assign(...array.map(k => ({ [k]: true })));

console.log(object);

Upvotes: 0

Mamun
Mamun

Reputation: 68933

The return value of forEach() is undefined. You also should assign the value to the object key with assignment (=) operator: 

var objectToCreate = {};
let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"];
myArray.forEach(prop => objectToCreate[prop] = true);
console.log(objectToCreate);

Upvotes: 3

Jordan Stubblefield
Jordan Stubblefield

Reputation: 523

You could iterate the array and assign to the objectToCreate, like this:

  var objectToCreate = {};
  let myArray = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"];
  myArray.forEach(key => objectToCreate[key] = true)';

Upvotes: 0

Jesper Johansson
Jesper Johansson

Reputation: 619

You can use Array.prototype.reduce to create an object with the keys like this:

const myObject = ["arrayValue", "anotherArrayValue", "arrayValueAsWell"]
  .reduce((acc, value) => ({ ...acc, [value]: true }), {});

console.log(myObject);

Upvotes: 5

Related Questions