simple-in-memory-queue/dist/logic/queue/split.js

A simple in-memory queue, for nodejs and the browser, with consumers for common usecases.

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.split = void 0;
const constants_1 = require("../../domain/constants");
/**
 * split the queued data into the selected and remainder data
 *
 * note
 * - this is the base function called by peek and pop
 * - this should not be called by users directly
 */
const split = ({ data, order, slice, }) => {
    // handle fifo
    if (order === constants_1.QueueOrder.FIRST_IN_FIRST_OUT) {
        const selection = data.slice(slice.start, slice.end);
        const remainder = [
            ...data.slice(0, slice.start),
            ...data.slice(slice.end), // all after the slice
        ];
        return { selection, remainder };
    }
    // handle lifo
    if (order === constants_1.QueueOrder.LAST_IN_FIRST_OUT) {
        const selection = data
            .slice(slice.end * -1, slice.start * -1 === 0 ? undefined : slice.start * -1)
            .reverse();
        const remainder = [
            ...data.slice(0, slice.end * -1),
            ...(slice.start > 0 ? data.slice(slice.start * -1) : []), // all after the slice
        ];
        return { selection, remainder };
    }
    // if the above didn't handle it, probably an error
    throw new Error('unexpected queue type');
};
exports.split = split;
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