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);

Answer 1

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

Answer 2

propName是字符串，但obj[propName]是数组。