From 2f1c0e9513b5e055271b8a6bebc25b0403ca16a0 Mon Sep 17 00:00:00 2001
From: Chalarangelo <chalarangelo@gmail.com>
Date: Fri, 18 Jun 2021 21:30:29 +0300
Subject: [PATCH] Add hasOne and hasMany

---
 snippets/hasMany.md | 19 +++++++++++++++++++
 snippets/hasOne.md  | 19 +++++++++++++++++++
 2 files changed, 38 insertions(+)
 create mode 100644 snippets/hasMany.md
 create mode 100644 snippets/hasOne.md

diff --git a/snippets/hasMany.md b/snippets/hasMany.md
new file mode 100644
index 000000000..087c80922
--- /dev/null
+++ b/snippets/hasMany.md
@@ -0,0 +1,19 @@
+---
+title: hasMany
+tags: array,beginner
+firstSeen: 2021-07-11T05:00:00-04:00
+---
+
+Checks if an array has more than one value matching the given function.
+
+- Use `Array.prototype.filter()` in combination with `fn` to find all matching array elements.
+- Use `Array.prototype.length` to check if more than one element match `fn`.
+
+```js
+const hasMany = (arr, fn) => arr.filter(fn).length > 1;
+```
+
+```js
+hasMany([1, 3], x => x % 2); // true
+hasMany([1, 2], x => x % 2); // false
+```
diff --git a/snippets/hasOne.md b/snippets/hasOne.md
new file mode 100644
index 000000000..1df6d6ace
--- /dev/null
+++ b/snippets/hasOne.md
@@ -0,0 +1,19 @@
+---
+title: hasOne
+tags: array,beginner
+firstSeen: 2021-07-04T05:00:00-04:00
+---
+
+Checks if an array has only one value matching the given function.
+
+- Use `Array.prototype.filter()` in combination with `fn` to find all matching array elements.
+- Use `Array.prototype.length` to check if only one element matches `fn`.
+
+```js
+const hasOne = (arr, fn) => arr.filter(fn).length === 1;
+```
+
+```js
+hasOne([1, 2], x => x % 2); // true
+hasOne([1, 3], x => x % 2); // false
+```