Understand own properties explanation

Can someone please explain this example to me? Why is this FOR statement used in this way I don’t recall coming across it, what is the IN for and how is it used? Why do we need a property variable?

  **Your code so far**

let ownProps = [];

for (let property in duck) {
  if(duck.hasOwnProperty(property)) {

  **Your browser information:**

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Challenge: Understand Own Properties

Link to the challenge:


The in operator returns true if the specified property is in the specified object or its prototype chain.

Some docs to look at.

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