如何减少 javascript 中数组的数字

Question

像54321这样的数组中有数字

array = ["54321"] ;

现在如何在控制台打印

1. 54321
2. 5432
3. 543
4. 54
5. 5

我不想手动打印，我想动态打印..

提前致谢。

Answer 1

您可以split将字符串放入数组中并使用reduce函数

ler arr = array[0].split('');

let result = arr.reduce((acc,i) => { 
                           acc.newarr.push(arr.slice(0,acc.counter).join(''));
                           acc.counter--;
                           return acc;
                         }, 
                       {newarr:[],counter:5});

console.log(result);

Answer 2

const array = ["54321"];


const print = ([x]) => {
  if (x.length === 0) return;
  console.log(x);
  print([x.slice(0, -1)]);
}

print(array)

Answer 3

const array = ["54321"];

const un_print = ([str]) =>
  Array.from(
    { length: str.length },
    (_, i) => (i + 1) + '. ' + str.slice(0, str.length - i)
  )
    .forEach((v) => console.log(v));

un_print(array);