Javascript计算总和，除非它小于零

Question

Just a quick question, can this sum be written in one short line:

  a = (b / c) * 100;
  if (a < 0) a = 0;

Apart from the obvious way which is equally long:

 if ((b / c) * 100) > 0) a = (b / c) * 100; else a = 0;

EDIT: And the ternary version of this is no different, I didn't think I needed to mention.

Maybe there isn't a short, neat and clever way to write this but I was just hoping there was since it always seems unnecessary to have that extra line underneath.

Answer 1

您可以将Math.max与零一起使用。

a = Math.max(b * 100 / c, 0);

Answer 2

您可以使用三元运算符：

a = ((b / c) * 100) >= 0 ? ((b / c) * 100) : 0;

Answer 3

You may use a ternary expression:

a = (b / c) * 100 > 0 ? (b / c) * 100 : 0;

This assigns a to the quantity (b / c) * 100 , unless that quantity be less than or equal to zero, in which case it just assigns zero to a .

Answer 4

// I do not think that *100 is necessary in your test
a = (b / c) < 0 ? 0 : (b / c) * 100;

Answer 5

这是我能想到的唯一方法

a = (b / c * 100) >= 0 ? (b / c * 100) : 0;

Answer 6

Actually the result is negative if one of b or c is negative (but not both). So a bit longer but actually with only necessary calculations and more comparisons:

b < 0 ? c > 0 ? a = 0 : a = b * 100  / c : c < 0 ? a = b * 100 : a = 0;