Input: fn =(x)=> x *2, args =[4], t =35Output:
[{"time":0,"returned":8},{"time":35,"returned":8},{"time":70,"returned":8},{"time":105,"returned":8},{"time":140,"returned":8},{"time":175,"returned":8}]Explanation:
const cancelTimeMs =190;const cancelFn = cancellable((x)=> x *2,[4],35);setTimeout(cancelFn, cancelTimeMs);Every 35ms, fn(4)is called. Until t=190ms, then it is cancelled.1st fn call is at 0ms.fn(4) returns 8.2nd fn call is at 35ms.fn(4) returns 8.3rd fn call is at 70ms.fn(4) returns 8.4th fn call is at 105ms.fn(4) returns 8.5th fn call is at 140ms.fn(4) returns 8.6th fn call is at 175ms.fn(4) returns 8.Cancelled at 190ms
Input: fn =(x1, x2)=>(x1 * x2), args =[2,5], t =30Output:
[{"time":0,"returned":10},{"time":30,"returned":10},{"time":60,"returned":10},{"time":90,"returned":10},{"time":120,"returned":10},{"time":150,"returned":10}]Explanation:
const cancelTimeMs =165;const cancelFn = cancellable((x1, x2)=>(x1 * x2),[2,5],30)setTimeout(cancelFn, cancelTimeMs)Every 30ms, fn(2,5)is called. Until t=165ms, then it is cancelled.1st fn call is at 0ms
2nd fn call is at 30ms
3rd fn call is at 60ms
4th fn call is at 90ms
5th fn call is at 120ms
6th fn call is at 150ms
Cancelled at 165ms
Input: fn =(x1, x2, x3)=>(x1 + x2 + x3), args =[5,1,3], t =50Output:
[{"time":0,"returned":9},{"time":50,"returned":9},{"time":100,"returned":9},{"time":150,"returned":9}]Explanation:
const cancelTimeMs =180;const cancelFn = cancellable((x1, x2, x3)=>(x1 + x2 + x3),[5,1,3],50)setTimeout(cancelFn, cancelTimeMs)Every 50ms, fn(5,1,3)is called. Until t=180ms, then it is cancelled.1st fn call is at 0ms
2nd fn call is at 50ms
3rd fn call is at 100ms
4th fn call is at 150ms
Cancelled at 180ms
We want to repeatedly call a function at a fixed interval, and be able to cancel the repeated calls at any time. We use setInterval to schedule repeated calls and return a cancel function that clears the interval.