From cbcbb35f7cbca8339d5a75fcd763bfb80149415b Mon Sep 17 00:00:00 2001
From: librz <rz19960718@gmail.com>
Date: Mon, 5 Sep 2022 11:45:34 +0800
Subject: [PATCH] feat(array): add filterByPredicates

---
 snippets/array/filter-by-predicates.md | 34 ++++++++++++++++++++++++++
 1 file changed, 34 insertions(+)
 create mode 100644 snippets/array/filter-by-predicates.md

diff --git a/snippets/array/filter-by-predicates.md b/snippets/array/filter-by-predicates.md
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+---
+title: Filter by predicates
+category: Array
+---
+
+**JavaScript version**
+
+```js
+const filterByPredicates = (arr, predicates, condition = "and") => arr.filter(
+  item => condition === "and" ? predicates.every(func => func(item)) : predicates.some(func => func(item))
+)
+```
+
+**TypeScript version**
+
+```js
+const filterByPredicates = <T, _>(
+  arr: T[], 
+  predicates: Array<(val: T) => boolean>, 
+  condition: "and" | "or" = "and"
+): T[] => arr.filter(
+  item => condition === "and" ? predicates.every(func => func(item)) : predicates.some(func => func(item))
+)
+```
+
+**Example**
+
+```js
+const nums = [-2, -1, 0, 1, 2, 3.1];
+const isEven = num => num % 2 === 0;
+const isPositive = num => num > 0;
+filterByPredicates(nums, [isPositive, Number.isInteger], "and"); // [1, 2]
+filterByPredicates(nums, [isEven, isPositive], "or"); // [-2, 0, 1, 2, 3.1] 
+```