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feature: slice sub #110

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merged 1 commit into from
Jul 5, 2024
Merged

feature: slice sub #110

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20 changes: 13 additions & 7 deletions utils/datautil/datautil.go
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Original file line number Diff line number Diff line change
Expand Up @@ -23,20 +23,20 @@ import (
"sort"
)

// SliceSubFunc returns elements in slice a that are not present in slice b (a - b) and remove duplicates.
// Determine if elements are equal based on the result returned by fn.
func SliceSubFunc[T any, E comparable](a, b []T, fn func(i T) E) []T {
// SliceSubFuncs returns elements in slice a that are not present in slice b (a - b) and remove duplicates.
// Determine if elements are equal based on the result returned by fna(a[i]) and fnb(b[i]).
func SliceSubFuncs[T, V any, E comparable](a []T, b []V, fna func(i T) E, fnb func(i V) E) []T {
if len(b) == 0 {
return a
}
k := make(map[E]struct{})
for i := 0; i < len(b); i++ {
k[fn(b[i])] = struct{}{}
k[fnb(b[i])] = struct{}{}
}
t := make(map[E]struct{})
rs := make([]T, 0, len(a))
for i := 0; i < len(a); i++ {
e := fn(a[i])
e := fna(a[i])
if _, ok := t[e]; ok {
continue
}
Expand All @@ -49,6 +49,12 @@ func SliceSubFunc[T any, E comparable](a, b []T, fn func(i T) E) []T {
return rs
}

// SliceSubFunc returns elements in slice a that are not present in slice b (a - b) and remove duplicates.
// Determine if elements are equal based on the result returned by fn.
func SliceSubFunc[T any, E comparable](a, b []T, fn func(i T) E) []T {
return SliceSubFuncs(a, b, fn, fn)
}

// SliceSub returns elements in slice a that are not present in slice b (a - b) and remove duplicates.
func SliceSub[E comparable](a, b []E) []E {
return SliceSubFunc(a, b, func(i E) E { return i })
Expand All @@ -62,8 +68,8 @@ func SliceSubAny[E comparable, T any](a []E, b []T, fn func(t T) E) []E {

// SliceSubConvertPre returns elements in slice a that are not present in slice b (a - b) and remove duplicates.
// fn is a function that converts elements of slice a to elements comparable with those in slice b.
func SliceSubConvertPre[E comparable, T any](a []T, b []E, fn func(t T) E) []E {
return SliceSub(Slice(a, fn), b)
func SliceSubConvertPre[E comparable, T any](a []T, b []E, fn func(t T) E) []T {
return SliceSubFuncs(a, b, fn, func(i E) E { return i })
}

// SliceAnySub returns elements in slice a that are not present in slice b (a - b).
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