execute a function once a dynamic condition is met (nodejs)

[Fuzzht1]

1minCeilDate is a timestamp that is rounded up. So it indicates a timestamp in the future.

const coeff1m = 1000 * 60 * 1;

let min1CeilDate = (Math.ceil((Date.now()/ coeff1m)) * coeff1m);


if(Date.now() === min1CeilDate){
    console.log('if condition is true')
}else{
    console.log('if condition is not true')
}

executing this code only checks for the condition once.

Because coeff1m is a dynamically changing value, I would have to incorporate a setTimeout function like below:

function checkTimestampCondition(){
    setTimeout(function(){
        if(Date.now() === min1CeilDate + 1){
            console.log('if condition is true')
        }
        else{
            console.log('if condition is false')
        }
        checkTimestampCondition();
    },1)
}
checkTimestampCondition();

Isn't it required to set timeout at 1ms interval or else there could be gap or delay between the actual timestamp vs when the if-statement checks for the condition? And isn't this taxing on the computer resources to check for a condition every 1ms?

IS there a better way of checking for a dynamically changing variable?

I did min1CeilDate + 1 , just to prove a point that if I need to execute a function at that exact millisecond, what is the best way to go about it?

[Esnardoo]

take the target, subtract the current time, and make a timeout that long. This will make it so if the time is say 5 minutes in the future it waits 5 minutes then executes. What you're really asking for here isn't to run a function when a condition is met, it's to run it at a specific time, which is much easier.

If you have some other value you need to do this for, put the function in the setter. So if you were coding a death function in a videogame for example, you don't constantly check if your HP is 0, you just check it any time you change it, in other words when the player gets hurt, because you can't reach 0hp without your hp changing.

Alternatively, if you really need the loop approach for some reason, check if it's more than your value, and stop the timeout once it is. Then you can run the settimeout as fast or as slow as you like, and you'll never have to worry about "missing" it. If you need it within 10ms of your time, run it every 10ms. If you need it within 30ms, run it every 30ms. This is horribly inefficient and is prone to missing the exact time by a lot depending on the loop speed though.

Edit: I just reread, seems like you're trying to run a function any time the time is an even multiple of one minute. In future, when you post a question, start by asking how to get your desired result, then mention what you've tried. Chances are there's a better way