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How to best implement an iterator
source link: https://yourbasic.org/golang/iterator-generator-pattern/
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How to best implement an iterator
yourbasic.org/golang
Go has a built-in range loop for iterating over slices, arrays, strings, maps and channels. See 4 basic range loop (for-each) patterns.
To iterate over other types of data, an iterator function with callbacks is a clean and fairly efficient abstraction.
Basic iterator pattern
// Iterate calls the f function with n = 1, 2, and 3.
func Iterate(f func(n int)) {
for i := 1; i <= 3; i++ {
f(i)
}
}In use:
Iterate(func(n int) { fmt.Println(n) })1
2
3Iterator with break
// Iterate calls the f function with n = 1, 2, and 3.
// If f returns true, Iterate returns immediately
// skipping any remaining values.
func Iterate(f func(n int) (skip bool)) {
for i := 1; i <= 3; i++ {
if f(i) {
return
}
}
}In use:
Iterate(func(n int) (skip bool) {
fmt.Println(n)
return n == 2
})1
2More code examples
Go blueprints: code for common tasks is a collection of handy code examples.
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