JSFiddle - React, Tailwind, and code Playground

by hescano

JavaScript

function mean(town, strng) {
    var myTown = strng.split('\n').filter(c => c.split(':')[0] === town)[0]
    if (myTown) {
    	myTown = myTown.split(':')[1];
      var t = myTown.split(',').map(c=>Number(c.split(' ')[1]));
    	return t.reduce((t, a) => t + a, 0) / t.length;
    }
    return -1;
}

function variance(town, strng) {
    var myTown = strng.split('\n').filter(c => c.split(':')[0] === town)[0];
     function getMean(arr) {
    	return arr.reduce((a,b)=>a+b) / arr.length;
    }
    
    if (myTown) {
    	myTown = myTown.split(':')[1];
    	var t = myTown.split(',').map(c=>Number(c.split(' ')[1]));
    var mean = getMean(t);
    return getMean(t.map(n=> Math.pow(n - mean, 2)));
    }
    
    return -1;
}

const data = 
     "Rome:Jan 81.2,Feb 63.2,Mar 70.3,Apr 55.7,May 53.0,Jun 36.4,Jul 17.5,Aug 27.5,Sep 60.9,Oct 117.7,Nov 111.0,Dec 97.9\nLondon:Jan 48.0,Feb 38.9,Mar 39.9,Apr 42.2,May 47.3,Jun 52.1,Jul 59.5,Aug 57.2,Sep 55.4,Oct 62.0,Nov 59.0,Dec 52.9\nParis:Jan 182.3,Feb 120.6,Mar 158.1,Apr 204.9,May 323.1,Jun 300.5,Jul 236.8,Aug 192.9,Sep 66.3,Oct 63.3,Nov 83.2,Dec 154.7\nNY:Jan 108.7,Feb 101.8,Mar 131.9,Apr 93.5,May 98.8,Jun 93.6,Jul 102.2,Aug 131.8,Sep 92.0,Oct 82.3,Nov 107.8,Dec 94.2\nVancouver:Jan 145.7,Feb 121.4,Mar 102.3,Apr 69.2,May 55.8,Jun 47.1,Jul 31.3,Aug 37.0,Sep 59.6,Oct 116.3,Nov 154.6,Dec 171.5\nSydney:Jan 103.4,Feb 111.0,Mar 131.3,Apr 129.7,May 123.0,Jun 129.2,Jul 102.8,Aug 80.3,Sep 69.3,Oct 82.6,Nov 81.4,Dec 78.2\nBangkok:Jan 10.6,Feb 28.2,Mar 30.7,Apr 71.8,May 189.4,Jun 151.7,Jul 158.2,Aug 187.0,Sep 319.9,Oct 230.8,Nov 57.3,Dec 9.4\nTokyo:Jan 49.9,Feb 71.5,Mar 106.4,Apr 129.2,May 144.0,Jun 176.0,Jul 135.6,Aug 148.5,Sep 216.4,Oct 194.1,Nov 95.6,Dec 54.4\nBeijing:Jan 3.9,Feb 4.7,Mar 8.2,Apr 18.4,May 33.0,Jun 78.1,Jul 224.3,Aug 170.0,Sep 58.4,Oct 18.0,Nov 9.3,Dec 2.7\nLima:Jan 1.2,Feb 0.9,Mar 0.7,Apr 0.4,May 0.6,Jun 1.8,Jul 4.4,Aug 3.1,Sep 3.3,Oct 1.7,Nov 0.5,Dec 0.7";
const data1 =
     "Rome:Jan 90.2,Feb 73.2,Mar 80.3,Apr 55.7,May...