Get value from Javascript object using for loop

Question

I am having an issue getting accessing the value from a key of an object.

I am passing in this.fields which has 2 objects in an array like,

[{'First Name': 'firstName'}, {'Last Name': 'lastName'}]

I am able to get the keys using the Object.keys function, but cannot figure out how to get the values associated with them.

let properties = [];
for (let field of this.fields) {
  console.log(field);
  properties.push({
    "name": Object.keys(field),
    "value": ""
  });
}

I have tried doing this.fields[field] to get it, but it is returning undefined. Any advice on how to approach this?

Wouldn't it make more sense to have 1 object with 2 keys instead of 1 array with 2 objects each one 1 key? — MinusFour
– MinusFour, Commented Oct 21, 2015 at 1:19

Felipe Brahm · Accepted Answer · 2015-10-21 01:23:29Z

2

let properties = [];
for (let field of this.fields) {
  for (let prop in field) {
    properties.push({ "name": prop, "value": field[prop] });
  }
}

edited Oct 21, 2015 at 1:23

answered Oct 21, 2015 at 1:19

Felipe Brahm

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2 Comments

Shawn Over a year ago

Thank you this works, I am assuming that I needed the 2nd for loop to go over the object once it was taken out of the array. Don't know why I didn't think of that!

Bergi Over a year ago

Avoid hasOwnProperty when you don't need it. Your first version was much better.

Amadan · Accepted Answer · 2015-10-21 01:19:06Z

1

If you have only one key/value pair, you can do:

let key = Object.keys(field)[0];
let value = field[key];

answered Oct 21, 2015 at 1:19

Amadan

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