Not Finding Empty Array Values in Object

Question

I am trying to understand why when I run the following code, none of the props return as true for being arrays. addresses and emails should return true I would think, and yet they return false.

let obj1 = {
  name: 'John',
  age: 42,
  addresses: [],
  emails: []
}


function findArrays(obj) {
  for (let propName in obj) {
    console.log(propName, Array.isArray(propName));
    // All values console.log as false
 }
}

findArrays(obj1);

Jonas Wilms · Accepted Answer · 2019-07-14 20:11:04Z

3

You iterate over the keys of the object (which are all strings, e.g. "emails"). The arrays are values of the object. To access the value stored under a specific key, use obj[propName].

answered Jul 14, 2019 at 20:11

Jonas Wilms

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Comments

nAviD · Accepted Answer · 2019-07-14 20:14:26Z

0

propName is string but obj[propName] is array.

answered Jul 14, 2019 at 20:14

nAviD

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