javascript - 从 3 Alphabet 创建一个唯一的 key

Question

我正在尝试使用字母创建唯一键；
我已经设法解决了，但我不太喜欢我采用的方法。而且我相信那里的某个人可能能够帮助我获得更好的方法来执行此代码。如果您有更好的主意，请告诉我？或者你有什么想法可以和我的比较？
我认为这可能是分享知识的好方法..提前谢谢

let string = 'ABE';
let ar1 = ["A", "B", "C", "D", "E"];
string = string.split('');

if (string[2] !=='E') {
  for (let i = 0; i < 5; i++) {
        if (string[2] === ar1[i]) {
          i = i+1;
          string[2] = ar1[i]
        }
    }
    string = string.toString().replace(/,/g, '');
    console.log("case 1", string);

} else if (string[1] !=='E' && string[2] ==='E') { 
    string[2] ='A';
    for (let i = 0; i < 5; i++) {
        if (string[1] === ar1[i]) {
          i = i+1;
          let newString = ar1[i];
          console.log(ar1[i]);
          string[1] = newString;
        }
    }
      string = string.toString().replace(/,/g, '');
      console.log("case 2", string);
} else if (string[1] ==='E' && string[2] ==='E') { 
    string[1] ='A';
    string[2] ='A';
    for (let i = 0; i < 5; i++) {
        if (string[0] === ar1[i]) {
          i = i+1;
          string[0] = ar1[i];
        }
    }
    string = string.toString().replace(/,/g, '');
    console.log("case 3", string);
}

结果如下:

if string = "AAA" Then the result "AAB"

if string = "AAE" Then result will be "ABA"

if string = "AEE" Then result will be "BAA"

Answer 1

您可以将值编码为数值，例如这个位置值

36  6  1
 C  B  A 
 2  1  0   78

并使用所需的字符和长度对递增的值进行编码。

function decode(value, characters) {
    const
        values = Object.fromEntries(Array.from(characters, (v, i) => [v, i]));
        
    return value
        .split('')
        .reduce((s, v) => s * characters.length + values[v], 0);
}

function encode(value, characters, length = 0) {
    let result = '';

    do {
        result = characters[value % characters.length] + result;
        value = Math.floor(value / characters.length);
    } while (value);
    
    return result.padStart(length, characters[0]);
}

console.log(decode('AAA', 'ABCDEF')); //   0
console.log(encode(0, 'ABCDEF', 3));  // AAA
console.log(encode(1, 'ABCDEF', 3));  // AAB

console.log(decode('CBA', 'ABCDEF')); //  78
console.log(encode(78, 'ABCDEF', 3)); // CBA
console.log(encode(79, 'ABCDEF', 3)); // CBB