In JavaScript, how can we find the number in an array that is closest in value to a specific object key?

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One way to find the number in an array that is closest in value to a specific object key in JavaScript is:

1. Create an array of numbers and specify the target key value.

   const arr = [5, 10, 15, 20, 25];
   const target = 18;
   

2. Use the map() method to create a new array with the absolute difference between each element in the original array and the target value.

   const diffArr = arr.map(num => Math.abs(num - target));
   

3. Use the Math.min() method to find the minimum value in the diffArr.

   const minDiff = Math.min(...diffArr);
   

4. Use the indexOf() method to find the index of the minimum value in the diffArr.

   const index = diffArr.indexOf(minDiff);
   

5. Return the element in the original array at the same index.

   const closestNum = arr[index];
   

6. The closestNum variable now holds the number in the array that is closest in value to the specified object key.