Debouncer Example in Go

debouncer.go

package main

import (
	"fmt"
	"time"
)

func debounce(f func(), delay string) func() {
	var t *time.Timer
	count := 0
	return func() {
		count += 1
		fmt.Printf("Debounce called %d times\n", count)
		duration, _ := time.ParseDuration(delay)
		if t != nil {
			t.Stop()
		}
		t = time.AfterFunc(duration, f)
	}
}

func main() {
	var searchText string

	callApi := func() {
		fmt.Printf("Called API with search string %s\n", searchText)
	}

	onChange := debounce(func() {
		callApi()
	}, "150ms")

	// Simulate user typing in search bar...
	searchPhrase := "Apple Computers"
	for i, c := range searchPhrase {
		searchText = searchText + string(c)
		onChange()
		if i%3 == 1 {
			time.Sleep(200 * time.Millisecond)
		}
		time.Sleep(50 * time.Millisecond)
	}
	time.Sleep(200 * time.Millisecond)
}

// Prints
/* 
Debounce called 1 times
Debounce called 2 times
Called API with search string Ap
Debounce called 3 times
Debounce called 4 times
Debounce called 5 times
Called API with search string Apple
Debounce called 6 times
Debounce called 7 times
Debounce called 8 times
Called API with search string Apple Co
Debounce called 9 times
Debounce called 10 times
Debounce called 11 times
Called API with search string Apple Compu
Debounce called 12 times
Debounce called 13 times
Debounce called 14 times
Called API with search string Apple Computer
Debounce called 15 times
Called API with search string Apple Computers

Program exited.
*/
// Try it at https://go.dev/play/p/GCUvOJL3aym