everyutil/number/normalize.js

A comprehensive library of lightweight, reusable utility functions for JavaScript and TypeScript, designed to streamline common programming tasks such as string manipulation, array processing, date handling, and more.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.normalize = void 0;
/**
 * Normalizes an array of numbers using min-max or z-score normalization.
 * @author @dailker
 * @param {number[]} numbers - The array of numbers to normalize.
 * @param {'minmax'|'zscore'} [method='minmax'] - The normalization method.
 * @returns {number[]} The normalized array.
 */
function normalize(numbers, method = 'minmax') {
    if (method === 'minmax') {
        const min = Math.min(...numbers), max = Math.max(...numbers);
        return numbers.map(n => (n - min) / (max - min));
    }
    const mean = numbers.reduce((a, b) => a + b, 0) / numbers.length;
    const std = Math.sqrt(numbers.reduce((a, b) => a + Math.pow(b - mean, 2), 0) / numbers.length);
    return numbers.map(n => (n - mean) / (std || 1));
}
exports.normalize = normalize;