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

The Interactive Extensions for JavaScript

import { identity } from '../util/identity';
/**
 * Computes the average of the iterable sequence.
 *
 * @export
 * @param {Iterable<any>} source The source iterable sequence to compute the average.
 * @param {MathOptions<any>} [options] The options for calculating the average.
 * @returns {number} The computed average for the iterable sequence.
 */
export function average(source, options) {
    const { ['selector']: selector = identity, ['thisArg']: thisArg } = options || {};
    let sum = 0;
    let count = 0;
    for (const item of source) {
        sum += selector.call(thisArg, item);
        count++;
    }
    if (count === 0) {
        throw new Error('Empty collection');
    }
    return sum / count;
}

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