使数字成为另一个数字的因素（性能问题）

I have this working JavaScript function and I'm wondering if there could be a better way of achieving the same result.

我有这个有效的JavaScript函数,我想知道是否有更好的方法来实现相同的结果。

function factorise(number, factor){
    if(factor === 0) return 0;
    return Math.round(number / factor) * factor;
}

Now If I would want my randomly generated number that happend to be 100 to be divideable by 3 I could use this function.

现在,如果我希望我的随机生成的数字100可以被3除以,我可以使用这个函数。

factorise(100, 3); ---> 99

factorise(100,3); ---> 99

Here are some other examples:

以下是其他一些例子:

factorise(27, 5); ---> 25

factorise(27,5); ---> 25

factorise(2095, 27); ---> 1206

factorise(2095,27); ---> 1206

As you can see the returned values contain the factor of the factor number passed to the function. But my concern is the performance of this. Would it be ideal to have it run in physics of a JavaScript game engine? On top of that I'd really want to have a better name for the function.

如您所见,返回的值包含传递给函数的因子编号的因子。但我担心的是这种表现。让它在JavaScript游戏引擎的物理中运行是否理想?最重要的是,我真的希望有一个更好的名称功能。

2 个解决方案

#1

Probably that code is not your bottleneck. But here is an alternative which does not use floating-point division. It's 10 times faster on Firefox.

可能代码不是你的瓶颈。但是这里有一个不使用浮点除法的替代方案。它在Firefox上快了10倍。

function factorise(number, factor) {
  if(factor === 0) return 0;
  var rem = number % factor;
  number -= rem;
  return 2*rem >= factor ? number+factor : number;
}
console.log(factorise(100, 3));   // 99
console.log(factorise(27, 5));    // 25
console.log(factorise(2095, 27)); // 2106

2 个解决方案

#1

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