DevDino 🦖

// setup.js
"use strict";
var __extends = (this && this.__extends) || (function () {
    var extendStatics = function (d, b) {
        extendStatics = Object.setPrototypeOf ||
            ({ __proto__: [] } instanceof Array && function (d, b) { d.__proto__ = b; }) ||
            function (d, b) { for (var p in b) if (Object.prototype.hasOwnProperty.call(b, p)) d[p] = b[p]; };
        return extendStatics(d, b);
    };
    return function (d, b) {
        if (typeof b !== "function" && b !== null)
            throw new TypeError("Class extends value " + String(b) + " is not a constructor or null");
        extendStatics(d, b);
        function __() { this.constructor = d; }
        d.prototype = b === null ? Object.create(b) : (__.prototype = b.prototype, new __());
    };
})();
var Origin = /** @class */ (function () {
    function Origin() {
    }
    return Origin;
}());
var Base = /** @class */ (function (_super) {
    __extends(Base, _super);
    function Base() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return Base;
}(Origin));
var A = /** @class */ (function (_super) {
    __extends(A, _super);
    function A() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return A;
}(Base));
var B = /** @class */ (function (_super) {
    __extends(B, _super);
    function B() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return B;
}(Base));
var C = /** @class */ (function (_super) {
    __extends(C, _super);
    function C() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return C;
}(Base));
var D = /** @class */ (function (_super) {
    __extends(D, _super);
    function D() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return D;
}(Base));
var E = /** @class */ (function (_super) {
    __extends(E, _super);
    function E() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return E;
}(Base));
var F = /** @class */ (function (_super) {
    __extends(F, _super);
    function F() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    return F;
}(Base));
var list = [];
for (var i = 0; i < 1000; i++) {
    list.push(new D());
}
function a() {}
function b() {}
function c() {}
function d() {}
function e() {}
function f() {}
const HANDLER_BY_CONSTRUCTOR = new Map([
    [A, a],
    [B, b],
    [C, c],
    [D, d],
    [E, e],
    [F, f]
]);

function getCommonElementCreator(element) {
    // 对于大多数单层继承的类，使用更快的方法
    if (HANDLER_BY_CONSTRUCTOR.get(element.constructor) !== undefined) {
        return HANDLER_BY_CONSTRUCTOR.get(element.constructor);
    }
    // 其他情况使用循环查找
    let prototype = Object.getPrototypeOf(Object.getPrototypeOf(element));

    while (prototype && prototype !== Base.prototype) {
        const elementType = HANDLER_BY_CONSTRUCTOR.get(prototype.constructor);
        if (elementType !== undefined) {
            return elementType;
        }
        prototype = Object.getPrototypeOf(prototype);
    }
    return;
}

// case 1
list.forEach(function (element) {
    if (element instanceof A) {
        a();
    }
    else if (element instanceof B) {
        b();
    }
    else if (element instanceof C) {
        c();
    }
    else if (element instanceof D) {
        d();
    }
    else if (element instanceof E) {
        e();
    }
    else if (element instanceof F) {
        f();
    }
});

// case 2
list.forEach(function (element) {
    const handler = getCommonElementCreator(element);
    
    if (handler)(
        handler()
    )
});