汇总一个数字，直到变成1位数JS [英] Sum up a number until it becomes 1 digit JS

问题描述

在标记重复的注释之前，它不是.其他人并没有寻找和我完全一样的东西.

最简单的方法是用javascript总结一个数字，直到只剩一位数字为止.例如:您输入5678，然后脚本将其加在一起(5 + 6 + 7 + 8)并得到26，但是由于它的位数超过1，因此再次将其添加并得到2 + 6 = 8.

是否可以使用任意大小的数字来执行此操作?脚本可以得到多紧凑?

解决方案

如果您正在寻找短片，那就很难打败了

 var n = 5678;
sum  = n % 9 || 9;

console.log(sum) 

如果您对它的工作方式感到好奇，请参阅:铸造九个数字.

Before you mark duplicate note that it isn't. Others didn't look for the exact same thing as me.

What is the most compact possible way to sum up a number in javascript until there is only one digit left. For example: You input 5678 then the script adds it together (5+6+7+8) and gets 26, but since its more than 1 digit it adds it again and gets 2+6=8.

Is there anyway to do this with a number of any size? And how compact can the script get?

解决方案

If you're looking for short, it's hard to beat:

var n = 5678;
sum  = n % 9 || 9;

console.log(sum)

If you're curious about how that works, see: casting out nines.

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