英文:
Possible to convert this OOP clock to a function?
问题
我在我的纯函数项目中有以下类。这是唯一的面向对象部分，我希望如果可能的话创建一个不需要实例化的函数。
我这样使用它：
const timer = new Clock(1);
await timer.start();
const coolDownTimer = new Clock(2);
const globalTimer = new Clock(3);
await globalTimer.start();
问题
将时钟设为面向对象是我能想到的唯一方法，所以我想知道是否可以在不创建Clock类实例的情况下实现？
const Clock = function (checkInterval) {
// ...（原始代码）
};
module.exports = Clock;
英文:
I have the below class in my otherwise pure function project. It is the only part that is OOP, and I and would like to make a function that isn't instantiated if possible.
I use it like so
const timer = new Clock(1);
await timer.start();
const coolDownTimer = new Clock(2);
const globalTimer = new Clock(3);
await globalTimer.start();
Question
Making the clock OOP was the only way I could think of, so I am wondering weather it would have been possible without making an instance of the Clock class?
const Clock = function (checkInterval) {
let offset;
let clock;
let interval;
// initialize
reset();
function start() {
if (!interval) {
offset = Date.now();
interval = setInterval(update, checkInterval);
};
};
function update() {
clock += delta();
};
function delta() {
const now = Date.now();
const d = now - offset;
offset = now;
return d;
};
function stop() {
if (interval) {
clearInterval(interval);
interval = null;
};
};
function reset() {
clock = 0;
};
function read() {
return clock;
};
// public API
this.start = start;
this.stop = stop;
this.reset = reset;
this.read = read;
};
module.exports = Clock;
答案1
得分: 1
将Clock函数修改为返回一个包含时钟状态的简单对象。然后，将方法替换为普通函数，这些函数以此对象作为参数并访问其属性。
需要导出所有应由客户端调用的函数。在下面的示例中，我导出了它们所有，但你可能会发现将其中一些保留为内部函数更合适。
function Clock(checkInterval) {
let self = {
offset: null,
clock: null,
interval: checkInterval
};
clock_reset(self);
return self;
}
function clock_start(clock) {
if (!clock.interval) {
clock.offset = Date.now();
clock.interval = setInterval(() => clock_update(clock), clock.interval);
};
};
function clock_update(clock) {
clock.clock += clock_delta(clock);
};
function clock_delta(clock) {
const now = Date.now();
const d = now - clock.offset;
clock.offset = now;
return d;
};
function clock_stop(clock) {
if (clock.interval) {
clearInterval(clock.interval);
clock.interval = null;
};
};
function clock_reset(clock) {
clock.clock = 0;
};
function clock_read(clock) {
return clock.clock;
};
module.exports = {
Clock,
clock_start,
clock_update,
clock_delta,
clock_stop,
clock_reset,
clock_read
};
英文:
Have the Clock function return a simple object containing the state of the clock. Then replace the methods with ordinary functions that take one of these objects as a parameter, and access the properties.
You'll need to export all the functions that should be callable by clients. In my example below I export them all, you may find it more appropriate to keep some of them internal.
function Clock(checkInterval) {
let self = {
offset: null,
clock: null,
interval: checkInterval
};
clock_reset(self);
return self;
}
function clock_start(clock) {
if (!clock.interval) {
clock.offset = Date.now();
clock.interval = setInterval(() => clock_update(clock), clock.interval);
};
};
function clock_update(clock) {
clock.clock += clock_delta(clock);
};
function clock_delta(clock) {
const now = Date.now();
const d = now - clock.offset;
clock.offset = now;
return d;
};
function clock_stop(clock) {
if (clock.interval) {
clearInterval(clock.interval);
clock.interval = null;
};
};
function clock_reset(clock) {
clock.clock = 0;
};
function clock_read(clock) {
return clock.clock;
};
module.exports = {
Clock,
clock_start,
clock_update,
clock_delta,
clock_stop,
clock_reset,
clock_read
};
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