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import React, { Component, createRef } from 'react'
import "./counter.css"
export default class Counter extends Component {
constructor(props) {
super(props)
this.ref = createRef()
this.update = this.update.bind(this)
}
componentDidMount() {
this.update()
}
componentWillUnmount() {
clearTimeout(this.timeout)
}
update() {
this.timeout = setTimeout(this.update, 250)
const population = getPopulation()
if (this.ref.current) {
this.ref.current.innerHTML = commatize(population)
}
}
render() {
return (
<div className="counter">
<div className="countValue" ref={this.ref} />
<div className="description">
CURRENT GLOBAL POPULATION
</div>
</div>
)
}
}
const aprilFirst = new Date(2021, 3, 1)
function getPopulation() {
const popAprilFirst = 7855013899
const popChangePerDay = 219251.934066
const secondsDelta = (new Date() - aprilFirst) / 86400000 // april = month 3
const population = popAprilFirst + secondsDelta * popChangePerDay
return Math.round(population)
}
const commatize = (n, radix) => {
radix = radix || -1
var nums = [], i, counter = 0, r = Math.floor
if (radix !== -1 && n > radix) {
n /= radix
nums.unshift(r((n * 10) % 10))
nums.unshift(".")
}
do {
i = r(n % 10)
n = r(n / 10)
counter += 1
if (n && ! (counter % 3))
{ i = ',' + r(i) }
nums.unshift(i)
}
while (n)
return nums.join("")
}
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