rate

The rate function limits the number of times a function can be executed within a given time interval, useful for rate limiting frequent calls.

Syntax

rate(callback, limit, interval)

Parameters

Name	Type	Description
callback	Function	Function to be executed.
limit	number	Maximum number of executions allowed per interval.
interval	number	Time interval in milliseconds for the limit.

Return Value

Type	Description
Function	Executes the callback if the limit has not been reached and returns true, else returns false

Examples

const limited = rate(() => console.log('Executed!'), 2, 1000);

limited(); // true
limited(); // true
limited(); // false (limit reached)
// After 1 second, the limit is reset

Notes

• Throws a TypeError if the callback is not a function or if limit/interval are not positive numbers.
• Useful for preventing resource overload or excessive API calls.

References

• MDN: setTimeout()