@gvray/eskit/lib/memoize.js

A rich and colorful toolkit about typescript and javascript.

"use strict";
var __read = (this && this.__read) || function (o, n) {
    var m = typeof Symbol === "function" && o[Symbol.iterator];
    if (!m) return o;
    var i = m.call(o), r, ar = [], e;
    try {
        while ((n === void 0 || n-- > 0) && !(r = i.next()).done) ar.push(r.value);
    }
    catch (error) { e = { error: error }; }
    finally {
        try {
            if (r && !r.done && (m = i["return"])) m.call(i);
        }
        finally { if (e) throw e.error; }
    }
    return ar;
};
var __spreadArray = (this && this.__spreadArray) || function (to, from, pack) {
    if (pack || arguments.length === 2) for (var i = 0, l = from.length, ar; i < l; i++) {
        if (ar || !(i in from)) {
            if (!ar) ar = Array.prototype.slice.call(from, 0, i);
            ar[i] = from[i];
        }
    }
    return to.concat(ar || Array.prototype.slice.call(from));
};
Object.defineProperty(exports, "__esModule", { value: true });
/**
 * Creates a memoized version of a function that caches results for identical arguments.
 * 创建函数的记忆化版本，为相同参数缓存结果。
 *
 * The memoized function will cache the result of the first call with specific arguments
 * and return the cached result on subsequent calls with the same arguments.
 * 记忆化函数将缓存第一次调用特定参数的结果，
 * 并在后续使用相同参数调用时返回缓存的结果。
 *
 * @template T - The type of the function to memoize / 要记忆化的函数类型
 * @param fn - The function to be memoized / 要记忆化的函数
 * @returns The memoized function / 记忆化的函数
 *
 * @example
 * ```typescript
 * // Expensive calculation function
 * function fibonacci(n: number): number {
 *   if (n <= 1) return n
 *   return fibonacci(n - 1) + fibonacci(n - 2)
 * }
 *
 * const memoizedFib = memoize(fibonacci)
 *
 * console.log(memoizedFib(40)) // First call - calculates result
 * console.log(memoizedFib(40)) // Second call - returns cached result instantly
 *
 * // Works with multiple arguments
 * const expensiveOperation = (a: string, b: number) => {
 *   console.log('Computing...')
 *   return `${a}-${b * 2}`
 * }
 *
 * const memoized = memoize(expensiveOperation)
 * memoized('test', 5) // Logs "Computing..." and returns "test-10"
 * memoized('test', 5) // Returns "test-10" without logging
 * ```
 *
 * @since 1.0.0
 */
var memoize = function (fn) {
    var cache = new Map();
    return (function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        var key = JSON.stringify(args);
        if (cache.has(key)) {
            return cache.get(key);
        }
        var result = fn.apply(void 0, __spreadArray([], __read(args), false));
        cache.set(key, result);
        return result;
    });
};
exports.default = memoize;
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