The find() method returns the value of the array element that passes a test (provided by a function).. The simplest and fastest way to check if an item is present in an array is by using … JavaScript variables can be objects. consists of elements of a single type laid out sequentially in memory.You When you want a single needle from the haystack, reach for find()!. When creating a computer program, it is important to consider the amount of time taken up by the algorithms you write in order to save computing time and power and make efficient programs. Big O notation mathematically describes the complexity of an algorithm in terms of time and space.