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Useful JavaScript Object Methods

You've learned that with for...in, you're able to loop (or iterate) over the properties of an object literal and access each property's value. For example:

const person = {
  name: 'Reggie',
  role: 'Software developer',
  skills: ['JavaScript', 'HTML', 'CSS'],
  isTeacher: true

for ( let prop in person ) {

The for...in loop above calls th...