iterutil is a small and handy Go utility package that makes your loops more elegant and ✨functional✨.
It’s designed to solve the problem where defer statements inside standard for loops only execute
when the entire function returns!
Times executes a callback function a specified number of times.
iterutil.Times(5, func (i int) {
fmt.Println(i) // prints 0 through 4
})Ranges iterates from start to end (exclusive) and applies the callback function to each index.
It supports both ascending and descending ranges.
iterutil.Ranges(2, 5, func (i int) {
fmt.Println(i) // prints 2, 3, 4
})
iterutil.Ranges(5, 2, func (i int) {
fmt.Println(i) // prints 5, 4, 3
})StepRanges lets you customize the step size, giving you full control over iteration intervals — forward or backward.
iterutil.StepRanges(0, 10, 2, func(i int) {
fmt.Println(i) // prints 0, 2, 4, 6, 8
})
iterutil.StepRanges(10, 0, -3, func (i int) {
fmt.Println(i) // prints 10, 7, 4, 1
})In traditional for loops, any defer statements execute only when the enclosing function returns — not after each
iteration.
With iterutil, you can use closures to scope each iteration and ensure defer runs right when you expect it to.
🎯
Example:
iterutil.Times(3, func (i int) {
defer fmt.Println("deferred", i)
fmt.Println("running", i)
})Output:
running 0
deferred 0
running 1
deferred 1
running 2
deferred 2
This project is licensed under the MIT License.