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lib/src/collection/Collection.ts

@@ -205,6 +205,17 @@ class Collection<T> {
         return new Collection(this._items.filter(func))
     }
 
+    find<T2>(func: KeyFunction<T, T2>): number | undefined {
+        let found_index: number | undefined = undefined
+        this._items.some((item, index) => {
+            if ( func(item, index) ) {
+                found_index = index
+                return true
+            }
+        })
+        return found_index
+    }
+
     when<T2>(bool: boolean, then: CollectionFunction<T, T2>): Collection<T> {
         if ( bool ) then(this)
         return this