javascript - 通过阈值对正/负数值进行稳健比较

Question

我想计算一个变量 average 是否与另一个变量 trackingAmount 相差某个 threshold 正(+)或负( -).

这些是限制条件:

• 如果 average 和 trackingAmount 之间的差异 (+/-) 超过threshold 值然后我想触发一个函数calcMultiTrack()

• 示例中的阈值称为trackTolerance

• average 可以是正数也可以是负数，trackingAmount

也是如此

What is the most robust, (maybe elegant is a better word here), way to handle such cases?

这是我目前所做的。

    average = average / (selItemsDimArray.length - 1); 
    var trackingAmount = 3 
    var trackTolerance = 0.2 

    //If number is positive 
    if (average >= 0) {
        if (average < (trackingAmount - trackTolerance) || average > (trackingAmount + trackTolerance)) {
            calcMultiTrack(); //This is the function I want to call if the numbers are not the same(threshold value applies)
            console.log("Positive average that differs with trackingAmount by more than +- tolerance");
        }
    }
    //Else number is negative
    else {
        if (average < (-(trackingAmount - trackTolerance)) || average > (-(trackingAmount + trackTolerance))) {
            calcMultiTrack();
            console.log("Negative average that differs with trackingAmount by more than +- tolerance");
        }
    }

Answer 1

绝对值函数是计算两个实数之间距离的理想方法。

Math.abs(average - trackingAmount) < threshold