countNumbers

Write a function called countNumbers, which accepts an array of strings. The function should return a count of the number of strings in the array that can be successfully converted into a number. For example, the string $"1"$ can be successfully converted to the number $1,$ but the string "hello" cannot be converted into a number.

Please note: you must use return to return your final value throughout this practice problem set. If you use console.log you will not return a value, and without a return value test cases will have nothing to check and will all fail.