数组中具有相同起始字符的Javascript组字

Question

我目前正在研究javascript，并且在尝试弄清楚如何处理此问题时遇到问题：

我有这样的带有特殊问号的单词数组

wordsArray = [“为什么”，“会”，“您”，“付款”，“用于”，“一个”，“电话”，“？”]；

我试图在数组的同一单独组中将具有相同起始字符的单词分组，示例输出将是：

firstArray = ["why", "would"] //<- all start with w
secondArray = ["you"]
thirdArray = ["pay", "phone"]//<- all start with p
fourthArray = ["for"]
fifthArray = ["a"] 
finalArray = ["?"]//<- special character like ?, :,.. in the same group

我该如何实现？我写错了这个问题，看起来好像我在问代码，但是我实际上是在寻求解决方案，以解决这个问题（逻辑上）

Answer 1

您可以使用Array.reduce

const wordsArray = ["why", "would", "you", "pay", "for", "a", "phone", "?"];

const binned = wordsArray.reduce((result, word) => {
  // get the first letter. (this assumes no empty words in the list)
  const letter = word[0];
  
  // ensure the result has an entry for this letter
  result[letter] = result[letter] || [];
  
  // add the word to the letter index
  result[letter].push(word);
  
  // return the updated result
  return result;
}, {})

console.log(binned);