JavaScript arrays have a built-in sum method to check if an array contains items meeting a condition, returning true or false.
By defining an array named readings (a set of scores) with items and using the sum method, we can test if the array includes items that satisfy a certain criteria using a function as an argument.
The method evaluates each array item with the provided function to determine if the condition is met.
Example conditions tested: whether there are items greater than or equal to eight (result was true because there was an item greater than eight), and whether there are items greater than nine (result was false because there was no item greater than nine).
The test was modified to check for items greater than or equal to nine, which resulted in true since there was an item equal to nine.
