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JavaScript challenge - running a for... in loop and reassigning the value of a found property

Zimmerman

Can somebody help me? Here is the challenge question I'm having a hard time on:

You are provided with an object called checkObj. Using a for... in loop, determine if the object contains the property foundNum. If it exists, reassign the value of found to 1.

Here is the object:

const checkObj = {
  oddNum: 1,
  evenNum: 2,
  foundNum: 5,
  randomNum: 18
};

let found = 0;

Here is my code:

for (const prop in checkObj) {
  if (checkObj.foundNum in checkObj) {
    found = 1;
  }
}

How do I reassign the value of a variable after running a for... in loop? Can somebody explain to me what I'm missing? Thank you very much!