@reactivex/ix-esnext-esm/iterable/average.js

The Interactive Extensions for JavaScript

import { identity } from '../util/identity';
/**
 * Computes the average of a sequence of values from the sequence either from the sequence itself
 * or from the selector function.
 * @example
 * // Using non chained version
 * const result = average([1, 2, 3]);
 * const result = Ix.Iterable.of(1, 2, 3).average();
 * console.log(result);
 * @param {Iterable<any>} source A sequence of values to calculate the average of.
 * @param {function(x: any): number} [selector] A transform function to apply to each element.
 * @returns {number} The average of the sequence of values.
 */
export function average(source, selector = identity) {
    let sum = 0;
    let count = 0;
    for (const item of source) {
        sum += selector(item);
        count++;
    }
    if (count === 0) {
        throw new Error('Empty collection');
    }
    return sum / count;
}

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