everyutil/array/chunkByCondition.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.chunkByCondition = void 0;
/**
 * Splits an array into chunks where the provided function returns true for consecutive elements.
 * @author @dailker
 * @template T
 * @param {T[]} array - The input array.
 * @param {(a: T, b: T, idx: number, arr: T[]) => boolean} fn - Condition function, receives current and previous element.
 * @returns {T[][]} - Array of chunks.
 */
function chunkByCondition(array, fn) {
    if (!array.length)
        return [];
    const result = [];
    let chunk = [array[0]];
    for (let i = 1; i < array.length; i++) {
        if (fn(array[i - 1], array[i], i, array)) {
            chunk.push(array[i]);
        }
        else {
            result.push(chunk);
            chunk = [array[i]];
        }
    }
    result.push(chunk);
    return result;
}
exports.chunkByCondition = chunkByCondition;