javascript - 如何找到数组对象中的近距离，并选择近距离并提取对象

Question

我试图在数据集数组中找到最接近的具有起点和终点的对象。

    startTime = 1559923201;
    endTime  = 1560009601; 
    DataSet  = [
    {"time":1549923201,"value":12}, 
    {"time":1559923200,"value":10},        
    {"time":1559923000,"value":5},        
    {"time":1560058490,"value":4},        
    {"time":1560058800,"value":3},  
    {"time":1560059500,"value":2}];

我可以找到最接近的，如何找到数组的索引。

var start = DataSet.reduce(function(prev,curr) {
return (Math.abs(curr["time"] - startTime) < Math.abs(prev["time"] - startTime) ? curr : prev);
}); 

var end = DataSet.reduce(function(prev,curr) {
return (Math.abs(curr["time"] - endTime) < Math.abs(prev["time"] - endTime) ? curr : prev);
}); 

我正在寻找的结果与数据集非常接近，如下所示:

    ResultSet  = [
    {"time":1559923200,"value":10},        
    {"time":1559923000,"value":5}];

提前致谢。

Answer 1

您可以过滤数据集并通过一些r调整可接受的时间范围:

const r = 500 // half a second either side of start time
DataSet.filter(d => (d.time >= startTime-r) && (d.time <= endTime+r))

返回:

[
    {"time":1559923200,"value":10},        
    {"time":1559923000,"value":5}
]