dd_xcx/node_modules/@antv/util/lib/memoize.js

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
var is_function_1 = require("./is-function");
/**
 * _.memoize(calColor);
 * _.memoize(calColor, (...args) => args[0]);
 * @param f
 * @param resolver
 */
exports.default = (function (f, resolver) {
    if (!is_function_1.default(f)) {
        throw new TypeError('Expected a function');
    }
    var memoized = function () {
        var args = [];
        for (var _i = 0; _i < arguments.length; _i++) {
            args[_i] = arguments[_i];
        }
        // 使用方法构造 key，如果不存在 resolver，则直接取第一个参数作为 key
        var key = resolver ? resolver.apply(this, args) : args[0];
        var cache = memoized.cache;
        if (cache.has(key)) {
            return cache.get(key);
        }
        var result = f.apply(this, args);
        // 缓存起来
        cache.set(key, result);
        return result;
    };
    memoized.cache = new Map();
    return memoized;
});
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