feat(object-util): Add two functions objectFilter & objectPick

Signed-off-by: Avior <git@avior.me>

packages/object-util/src/ObjectUtil.ts

@@ -385,6 +385,39 @@ export function objectGet<T = any>(obj: any, path: Array<string | number | symbo
 	throw new Error(`it should never get there ! (${JSON.stringify(obj)}, ${path}, ${JSON.stringify(pointer)})`)
 }
 
+/**
+ * Only return the specified keys from the object
+ *
+ * @param obj the object to pick from
+ * @param keys the keys to keep
+ * @returns a new copy of `obj` with only `keys` in it
+ */
+function objectPick<V, K extends string | number | symbol>(obj: Record<K, V>, ...keys: Array<K>): Pick<Record<K, V>, K> {
+	mustBeObject(obj)
+	return objectFilter(obj, (_, k) => keys.includes(k)) as Pick<Record<K, V>, K>
+}
+
+/**
+ * filter elements from the object and return a new copy
+ *
+ * @param obj the object to filter
+ * @param fn the function to pass it through
+ * @returns the filtered object
+ */
+function objectFilter<V, K extends string | number | symbol>(obj: Record<K, V>, fn: (v: V, k: K, idx: number) => boolean): Partial<Record<K, V>> {
+	mustBeObject(obj)
+	const clone: Partial<Record<K, V>> = {}
+	objectLoop(obj, (v, k, idx) => {
+		const res = fn(v, k, idx)
+		if (res) {
+			clone[k] = v
+		}
+	})
+
+	return clone
+}
+
+
 /**
  * return if an item is an object
  *
@@ -414,12 +447,14 @@ export default {
 	objectClean,
 	objectClone,
 	objectEqual,
+	objectFilter,
 	objectFind,
 	objectGet,
 	objectKeys,
 	objectLoop,
 	objectMap,
 	objectOmit,
+	objectPick,
 	objectRemap,
 	objectSet,
 	objectSize,