/**
* Count all the numbers in an array
*
* @param {number[]} arr - An array containing numbers
* @returns {object} - an object where the key is the number, and the value is the count of that number
*
* ex: countNumbers([1,1,1,2,2,3,4])
* returns { 1:3, 2:2, 3:1, 4:1 }
*/
function countNumbers() {
}
module.exports = countNumbers