👉 In computer science, nullness is a concept where an object's value or state (like being null in programming) is considered as undefined or not present. In data types like arrays, strings, and numbers, null values are often used to represent an empty set or collection of elements that do not exist. For example, consider the following array: ``` let arr = [1, 2, null, "Hello", 3]; console.log(arr.length); // Output: 4
