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                // 請寫一個函式 finaAllSmall,接收一個陣列跟一個數字 n,回傳一個裡面有所有小於 n 的數的陣列(需按照原陣列順序)。
// findAllSmall([1, 2, 3], 10) 正確回傳值:[1, 2, 3]
// findAllSmall([1, 2, 3], 2) 正確回傳值:[1]
// findAllSmall([1, 3, 5, 4, 2], 4) 正確回傳值:[1, 3, 2]

function findAllSmall (arr, n) {
    let qualification = []
    let newArr = arr.filter(item => 
        // let rule = item < n
        // if (rule) {
        //     qualification.push(item)
        // }
        item < n
    return newArr

findAllSmall([1, 2, 3], 10)
findAllSmall([1, 2, 3], 2)
findAllSmall([1, 3, 5, 4, 2], 4)