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習題 7 -- JavaScript 練習 3 #17

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@ccckmit
  1. 請寫一個函數可以把英文月份轉成數字

    monthToIndex('October') // 10

  2. 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 }

  3. 請把 上次寫的矩陣相加和相乘 物件化

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