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package u
func Filter[T any](v []T, f func(T) bool) []T {
var result []T
for _, s := range v {
if f(s) {
result = append(result, s)
}
}
return result
}
func Map[T any, V any](a []T, f func(T) V) []V {
result := make([]V, len(a))
for i, v := range a {
result[i] = f(v)
}
return result
}
func First[T any](v []T) (T, bool) {
if len(v) == 0 {
var zero T
return zero, false
}
return v[0], true
}
func FirstOrZero[T any](v []T) T {
if len(v) == 0 {
var zero T
return zero
}
return v[0]
}
func LastOrZero[T any](v []T) T {
if len(v) == 0 {
var zero T
return zero
}
return v[len(v)-1]
}
func ChunkBy[T any](items []T, chunkSize int) [][]T {
chunks := make([][]T, 0, (len(items)/chunkSize)+1)
for chunkSize < len(items) {
items, chunks = items[chunkSize:], append(chunks, items[0:chunkSize:chunkSize])
}
return append(chunks, items)
}
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