在javascript中查找数组中连续数字之间的差异 [英] Finding difference between consecutive numbers in an array in javascript

问题描述

我有以下数组

  A = [1,2,3,3,0] 
  

如果我想计算数组中连续数字之间的差异。我可以在Matlab中使用内置函数（ diff ）

B = diff（A）返回

  B = [1,1,0，-3] 
  

我想知道javascript中有任何类似的内置函数吗？

解决方案

没有这样的内置函数，但写一个很简单：

  function diff（ary）{
 var newA = []; 
 for（var i = 1; i< ary.length; i ++）newA.push（ary [i]  -  ary [i  -  1]）$ ​​b $ b返回newA; 
} 
 var A = [1,2,3,3,0]; 
 console.log（diff（A））// [1,1,0，-3] 
  

这里是小提琴： https://jsfiddle.net/ewbmrjyr/1/ / p>

I have the following array

A=[1,2,3,3,0] 

and if I want to calculate difference between consecutive numbers in an array. I could do it in Matlab with using built-in function (diff)

B=diff(A) returns

B = [1,1,0,-3]

I would like to know there is any similar built-in function in javascript?

解决方案

There's no such built-in function, but writing one is simple:

function diff(ary) {
    var newA = [];
    for (var i = 1; i < ary.length; i++)  newA.push(ary[i] - ary[i - 1])
    return newA;
}
var A = [1, 2, 3, 3, 0];
console.log(diff(A)) // [1, 1, 0, -3]

here is the fiddle: https://jsfiddle.net/ewbmrjyr/1/

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