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Transform an array to its mean
import { Pipe, PipeTransform } from '@angular/core';
name: 'mean'
export class MeanPipe implements PipeTransform {
transform(value: number[]): number {
if (!Array.isArray(value)) {
return value;
if (value.length === 0) {
return undefined;
const sum = value.reduce((n: number, m: number) => n + m, 0);
return sum / value.length;
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