javascript - 从两个数组之间的差异获取百分比值javascript

Question

我有 2 个数组:

var a = [120, 148, 50]
var b = [90, 100, 150] 

我如何获得 a 和 b 之间的差异，例如:

var c = [ -28.57, -38.71 , 100 ]

即:120 和 90 之间的差等于 -28.57

感谢您的帮助

Answer 1

您想要计算增加的​​百分比。

% Increase = [(new value - orig value) / orig value] * 100

const increasePercentage = (n, m) => (m - n) / n * 100

let a = [120, 148, 50]
let b = [90, 100, 150] 
let c = a.map((n, i) => increasePercentage(n, b[i]))

console.log(c); // [ -25%, -32.43%, 200% ]

<小时/>

如果您想计算 PEPEGA 提到的百分比差异，只需更改公式即可。

% Difference = [(new value - orig value) / ((new value + orig value) / 2)] * 100

const increaseValue = (n, m) => (m - n) / ((m + n) / 2) * 100

let a = [120, 148, 50]
let b = [90, 100, 150] 
let c = a.map((n, i) => increaseValue(n, b[i]))

console.log(c); // [ -28.57%, -38.71%, 100% ]