@newdash/newdash/.internal/shortOut.js

javascript/typescript utility library

"use strict";
var __importDefault = (this && this.__importDefault) || function (mod) {
    return (mod && mod.__esModule) ? mod : { "default": mod };
};
Object.defineProperty(exports, "__esModule", { value: true });
const CONSTANTS_1 = require("./CONSTANTS");
const nativeNow_1 = __importDefault(require("./nativeNow"));
/**
 * Creates a function that'll short out and invoke `identity` instead
 * of `func` when it's called `HOT_COUNT` or more times in `HOT_SPAN`
 * milliseconds.
 *
 * @private
 * @param {Function} func The function to restrict.
 * @returns {Function} Returns the new shortable function.
 */
function shortOut(func) {
    var count = 0, lastCalled = 0;
    return function () {
        var stamp = (0, nativeNow_1.default)(), remaining = CONSTANTS_1.HOT_SPAN - (stamp - lastCalled);
        lastCalled = stamp;
        if (remaining > 0) {
            if (++count >= CONSTANTS_1.HOT_COUNT) {
                return arguments[0];
            }
        }
        else {
            count = 0;
        }
        return func.apply(undefined, arguments);
    };
}
exports.default = shortOut;