如何使用字典对象比较Java中给定数组的键？

2024-05-04 • 问答

我正在执行代码挑战，想在单词字符串中找到“最高价值”单词。在我的对象中，我已将“ a-z”字符分配为键，并将数字“ 1-26”分配为值。我想知道是否有一种方法可以将给定字符串的单词中的字母与我的字典对象进行比较，并开始将这些字母的值相加，以找到“最高价值”的单词。这是我的字典对象：

let testStr = 'man i need a taxi up to ubud'
testStr.split(' ')
const values = [...Array(27).keys()]
values.shift()
const keys = String.fromCharCode(...[...Array('z'.charCodeAt(0) - 'a'.charCodeAt(0) + 1).keys()]
  .map(i => i + 'a'.charCodeAt(0)))
const merged = [...keys].reduce((obj,key,index) => ({ ...obj,[key]: values[index]
}),{})
console.log(JSON.stringify(merged) + '\n' + testStr)

您可以使用map和reduce来获取每个单词的值。您还可以将单词的索引与值一起存储，然后将值从高到低排序，然后直接使用[0]访问最大值，并通过索引[1]直接访问单词。

let testStr = 'man i need a taxi up to ubud'

const values = [...Array(27).keys()]
values.shift()

const keys = String.fromCharCode(...[...Array('z'.charCodeAt(0) - 'a'.charCodeAt(0) + 1).keys()]
    .map(i => i + 'a'.charCodeAt(0)))
const merged = [...keys].reduce((obj,key,index) => ({ ...obj,[key]: values[index] }),{})

console.log(
  testStr.split(' ')
    .map(w => [w.split('').reduce((a,l) => (a += merged[l] || 0),0),w])
    .sort(([a],[b]) => b - a)[0][1]
)

然后您可以将其转换为util函数：

const values = [...Array(27).keys()]
values.shift()

const map = [...String.fromCharCode(...[...Array('z'.charCodeAt(0) - 'a'.charCodeAt(0) + 1).keys()]
  .map(i => i + 'a'.charCodeAt(0)))].reduce((obj,[key]: values[index]}),{})

const getHighest = s => (
  s.toLowerCase()
    .split(' ')
    .map((w,i) => [w.split('').reduce((a,l) => (a += map[l] || 0),[b]) => b - a)[0][1]
)


console.log(getHighest('man i need a taxi up to ubud'))
console.log(getHighest('This is a test'))

但是，在循环中而不是事先在映射中获取值时，编写起来更容易，更短：

const getHighest = s => (
  s.toLowerCase()
    .split(' ')
    .map((w,l) => (a += l.charCodeAt() || 0),[b]) => b - a)[0][1]
)


console.log(getHighest('man i need a taxi up to ubud'))
console.log(getHighest('This is a test'))

    if items.selectedOption == 1 {
        lblSubTotal.text = "$\(formatter.string(for: items.price1)!)"
        lblWeight.text = "\(items.weight1)"            

    } else if items.selectedOption == 2 {
        lblSubTotal.text = "$\(formatter.string(for: items.price2)!)"
        lblWeight.text = "\(items.weight2)"

    } else if items.selectedOption == 3 {
        lblSubTotal.text = "$\(formatter.string(for: items.price3)!)"
        lblWeight.text = "\(items.weight3)"

    }

如何使用字典对象比较Java中给定数组的键？

shanyecai 回答：如何使用字典对象比较Java中给定数组的键？

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