JavaScript JavaScript Loops, Arrays and Objects Tracking Data Using Objects Accessing All of the Properties in an Object

Anna Gallishaw
Anna Gallishaw
Full Stack JavaScript Techdegree Student 2,684 Points

JavaScript Loops, Arrays, and Objects - For In Loop Challenge Task 1 of 2

This challenge's instructions are "Use a for in loop to log each of the property names of the shanghai object to the console."

My code was:

var shanghai = {
  population: 14.35e6,
  longitude: '31.2000 N',
  latitude: '121.5000 E',
  country: 'CHN'

for (prop in shanghai) {
  console.log(prop, ': ', shanghai[prop]);

and I received this error code:

"There was an error with your code: ReferenceError: Strict mode forbids implicit creation of global property 'prop'."

What am I missing here? Thanks in advance for your help.

3 Answers

Asif Ulfat
Asif Ulfat
8,610 Points

Hi Anna,

This should help for task 1:

for (var prop in shanghai) { console.log(prop);


The prop variable isn't declared yet.