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請寫一個函數可以把英文月份轉成數字
monthToIndex('October') // 10
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請寫一個函數可以數詞彙陣列中每個詞出現多少次
var list = ['a', 'dog', 'chase', 'a', 'cat']
var cmap = count(list) // { a: 2, dog: 1, chase: 1, cat: 1 } -
請把 上次寫的矩陣相加和相乘 物件化
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