initial commit

backend/pkg/slices/map.go

@@ -0,0 +1,36 @@
+package slices
+
+// Map consumes []T and a function that returns D
+func Map[T, D any](srcItems []T, mapFunc func(T) D) []D {
+	dstItems := make([]D, len(srcItems))
+	for i, v := range srcItems {
+		dstItems[i] = mapFunc(v)
+	}
+	return dstItems
+}
+
+// First returns the first of a slice
+func First[T any](s []T) (item T, found bool) {
+	if len(s) > 0 {
+		return s[0], true
+	}
+	return item, false
+}
+
+// Last returns the last of a slice
+func Last[T any](s []T) (item T, found bool) {
+	if len(s) > 0 {
+		return s[len(s)-1], true
+	}
+	return item, false
+}
+
+// FindFirst finds the first matching item in s given fn
+func FindFirst[T any](s []T, fn func(T) bool) (item T, found bool) {
+	for _, v := range s {
+		if fn(v) {
+			return v, true
+		}
+	}
+	return item, false
+}