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Golang - Loop over slice in batches (run something in parallel on a sub-slice)
source link: https://gist.github.com/VojtechVitek/00f8f22b0ab3ec221815fcd78f244edd
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Loop over slice in batches (run something in parallel on a sub-slice) · GitHub
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Golang - Loop over slice in batches (run something in parallel on a sub-slice)
for i := 0; i < len(recipients); i += batch {
j := i + batch
if j >= len(recipients) {
j = len(recipients) - 1
}
fmt.Printf("recipients[%v:%v]\n", i, j)
}
I think you're expecting to iterate with this condition i < len(recipients)
if j >= len(recipients) {
j = len(recipients)
}When j is greater than or equal to len recipients), j is appropriate for len(recipients).
Because slice slicing does not include the slicing end point( recipients[i: j] are include i ~ j-1 in fact).
Author
Guys, the gist works correctly. I added a link to https://play.golang.org/p/mgd814w8xx6 so you can play around with it.
Works like a charm .. This saved me so much time.. Thank you
Here is a generic version:
func batchSlice[T any](in []T, size int) (out [][]T) {
out = make([][]T, 0)
if size == 0 {
panic("slice batch size is 0")
}
for i := 0; i < len(in); i = i + size {
j := i + size
if j > len(in) {
j = len(in)
}
out = append(out, in[i:j])
}
return
}Recommend
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