@arrows/array/range_.js

Functional tools for JS arrays

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.range_ = void 0;
/**
 * Creates an array of numbers in a provided range - ascending or descending.
 *
 * @param from Starting number (included)
 * @param to Ending number (excluded)
 * @param step Step (must be greater than zero)
 * @returns Range array
 */
const range_ = (from, to, step = 1) => {
    if (from === to) {
        return [];
    }
    if (step <= 0) {
        throw new Error("Step must be greater than zero.");
    }
    const arr = new Array(Math.floor(Math.abs(to - from) / step));
    let i = from;
    let j = 0;
    if (from > to) {
        while (i > to) {
            arr[j] = i;
            i -= step;
            j++;
        }
    }
    else {
        while (i < to) {
            arr[j] = i;
            i += step;
            j++;
        }
    }
    return arr;
};
exports.range_ = range_;
exports.default = range_;