up3

server/internal/sliceutil/sliceutil.go

@@ -0,0 +1,49 @@
+package sliceutil
+
+import "slices"
+
+// Convert converts a slice of type B to a slice of type A. Convert panics if B
+// cannot be type asserted to type A.
+func Convert[A, B any, S ~[]B](v S) []A {
+	a := make([]A, len(v))
+	for i, b := range v {
+		a[i] = (any)(b).(A)
+	}
+	return a
+}
+
+// SearchValue iterates through slice v, calling function f for every element.
+// If true is returned in this function, the respective element is returned and
+// ok is true. If the function f does not return true for any element, false is
+// returned.
+func SearchValue[A any, S ~[]A](v S, f func(a A) bool) (a A, ok bool) {
+	for _, val := range v {
+		if f(val) {
+			return val, true
+		}
+	}
+	return
+}
+
+// Filter iterates over elements of collection, returning an array of all
+// elements function c returns true for.
+func Filter[E any](s []E, c func(E) bool) []E {
+	a := make([]E, 0, len(s))
+	for _, e := range s {
+		if c(e) {
+			a = append(a, e)
+		}
+	}
+	return a
+}
+
+// DeleteVal deletes the first occurrence of a value in a slice of the type E
+// and returns a new slice without the value.
+func DeleteVal[E any](s []E, v E) []E {
+	for i, vs := range s {
+		if (any)(v) == (any)(vs) {
+			return slices.Delete(s, i, i+1)
+		}
+	}
+	return s
+}