数组中两个相邻数字之间的差异 [英] Difference between two adjacent numbers in array

问题描述

我开始冒险使用AngularJS，我有一个问题，是否可以计算两个数字之间的差异？

I start my adventure with AngularJS and I have a question, is it possible to calculate the difference between two numbers?

从SQL中提取数据后 - 我得到了一个像这样的表格，我希望在第1天< -2,2< -3等等之间获得访问之间的差异。

After extracting data from SQL - I get a table like this, I would like to receive a difference between visits on days 1 <- 2, 2 <-3, etc.

推荐答案

我认为它在简单的javascript范围内。

I think its in the scope of simple javascript.

如果您的数据包含在数组中，只需对其进行简单的迭代，并将当天访问与前一天的访问进行比较。

If you have your data in an array just use a simple iteration on it and compare the visit of current day to the visits from previous day.

一个非常简单的解决方案可能是：

A very simple solution might be:

var visitsArr = [38,29,18,29,28,18,24];

checkVisitsDiff(visitsArr);


function checkVisitsDiff(arr){
  //Input validation check 
  if(!arr || arr.length <2){
     throw "Bad input!";
  }

  //If input is ok - Start from second element
  for(var i=1; i<arr.length; i++){
      var currentElement  = arr[i];
      var previousElement = arr[i-1];
      console.log("The difference from visit " + i + " to visit " +(i-1) + " is: " +(currentElement-previousElement));
  }
}

我希望你提出这个问题。

I hope this what you asked.

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