everyutil/string/shiftText.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.shiftText = void 0;
/**
 * Shifts characters in the string like a Caesar cipher.
 *
 * Example: shiftText("abc", 1) → "bcd"
 *
 * @author @dailker
 * @param {string} str - The input string.
 * @param {number} shift - The number of positions to shift each letter.
 * @returns {string} The shifted string.
 */
function shiftText(str, shift) {
    return str.replace(/[a-z]/gi, c => {
        const base = c >= 'a' && c <= 'z' ? 97 : 65;
        return String.fromCharCode(((c.charCodeAt(0) - base + shift) % 26 + 26) % 26 + base);
    });
}
exports.shiftText = shiftText;