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import { Pipe, PipeTransform } from '@angular/core'
// Thanks: https://github.com/danrevah/ngx-pipes/blob/master/src/ng-pipes/pipes/math/bytes.ts
@Pipe({ name: 'myNumberFormatter' })
export class NumberFormatterPipe implements PipeTransform {
private dictionary: Array<{max: number, type: string}> = [
{ max: 1000, type: '' },
{ max: 1000000, type: 'K' },
{ max: 1000000000, type: 'M' }
]
/**
* @param x number
* @param n number of decimals to get (defaults to 1, needs to be >= 1)
*/
static getDecimalForNumber (x: number, n = 1) {
const v = x.toString().split('.')
const f = v[1] || ''
if (f.length > n) return +f.substr(0, n)
return +f
}
transform (value: number) {
const format = this.dictionary.find(d => value < d.max) || this.dictionary[this.dictionary.length - 1]
const calc = value / (format.max / 1000)
const integralPart = Math.floor(calc)
const decimalPart = NumberFormatterPipe.getDecimalForNumber(calc)
return integralPart < 10 && decimalPart > 0
? `${integralPart}.${decimalPart}${format.type}`
: `${integralPart}${format.type}`
}
}
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