Question

84

Calculate percentage from associative array in JS

rated 0 times [ 90] [ 6] / answers: 1 / hits: 5014 / 7 Years ago, tue, october 17, 2017, 12:00:00

Suppose I have an array like this:

var arr = [];

arr[india] = 7;

arr[indonesia] = 3;

arr[usa] = 1;



    [india: 7, indonesia: 3, usa: 1]

I need to get an array like [india: (7/11*100), indonesia: (3/11*100), usa: (1/11*100)] , i.e., to get the percentage of each country value using a single loop in javascript. How can I achieve it ?

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jaelynncherokeeg

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3 Years ago

answered 7 Years ago emmaleet · Accepted Answer

You can use array#reduce to sum up all values and then calculate percentages inside array#map

var arr = {};

arr[india] = 7;

arr[indonesia] = 3;

arr[usa] = 1;



let sum = Object.keys(arr).reduce((s,k) => s += arr[k], 0);



var result = Object.keys(arr).map(k => ({[k] : (arr[k]/sum * 100).toFixed(2)}));



console.log(result);