Question: What does setInterval return typescript?

What is the return type of setInterval TypeScript?

js setInterval() returns a Timer object instead of a numeric id. To work around this, you can either specify Timer as the return type, infer the return type, or use window. setInterval() instead of setInterval() (which will return a numeric id as expected).

What is setInterval in JavaScript?

The setInterval() method in JavaScript is used to repeat a specified function at every given time-interval. It evaluates an expression or calls a function at given intervals. This method continues the calling of function until the window is closed or the clearInterval() method is called.

What does setTimeout do in TypeScript?


A number representing the time interval in milliseconds (1000 milliseconds equals 1 second) to wait before executing the code. If you specify a value of 0 (or omit the value), the function will run as soon as possible.

What is the difference between setTimeout and setInterval?

setTimeout(expression, timeout); runs the code/function once after the timeout. setInterval(expression, timeout); runs the code/function repeatedly, with the length of the timeout between each repeat. Example: setInterval fires again and again in intervals, while setTimeout only fires once.

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What is setInterval return value?

The setInterval() returns a numeric, non-zero number that identifies the created timer. You can pass the intervalID to the clearInterval() to cancel the timeout. Note that the setInterval() works like the setTimeout() but it repeatedly executes a callback once every specified delay.

How do you stop setInterval?

Use a variable and call clearInterval to stop it. var interval; $(document). on(‘ready’,function(){ interval = setInterval(updateDiv,3000); }); and then use clearInterval(interval) to clear it again.

Is setInterval called immediately?

The setInterval() method always invokes the function after the delay for the first time using two approaches: … This will execute the function once immediately and then the setInterval() function can be set with the required callback.

How accurate is setInterval?

Here, we have used a setInterval method, which, though deemed unreliable in a single threaded environment, is extremely accurate when running on a separate thread.

Is setInterval blocking?

So, as long as your setInterval() handler doesn’t get stuck and run forever, it won’t block other things from eventually running. It might delay them slightly, but they will still run as soon as the current setInterval() thread finishes.

Does setInterval affect performance?

This is unlikely to make much of a difference though, and as has been mentioned, using setInterval with long intervals (a second is big, 4ms is small) is unlikely to have any major effects.

How do I know if setTimeout is done?

Just set t to 0 (or t in your case) in your timeout function: timeoutID = 0; If you use clearTimeout it sets the timeout id to 0, so checking for timeoutID === 0 will check if it’s either been been cleared or completed.

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What is the return value of setTimeout?

You can’t get a return value from the function you pass to setTimeout . The function that called setTimeout ( x in your example) will finish executing and return before the function you pass to setTimeout is even called.

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