From e9049b36f7789e84e1d95f34806e2c1bd05c1a4b Mon Sep 17 00:00:00 2001
From: hyesungoh <haesungoh414@gmail.com>
Date: Tue, 21 May 2024 16:14:59 +0900
Subject: [PATCH] =?UTF-8?q?=EC=B1=95=ED=84=B0=2012?=
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 create mode 100644 "\354\261\225\355\204\260_12/\354\230\244\355\230\234\354\204\261.md"

diff --git "a/\354\261\225\355\204\260_12/\354\230\244\355\230\234\354\204\261.md" "b/\354\261\225\355\204\260_12/\354\230\244\355\230\234\354\204\261.md"
new file mode 100644
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+++ "b/\354\261\225\355\204\260_12/\354\230\244\355\230\234\354\204\261.md"
@@ -0,0 +1,40 @@
+# 함수형 반복
+
+## Map
+
+```js
+function map(arr, f) {
+    const newArr = []
+    for (const val of arr) {
+        newArr.push(f(val))
+    }
+    return newArr
+}
+```
+
+## Filter
+
+```js
+function filter(arr, f) {
+    const newArr = []
+    for (const val of arr) {
+        if (f(val)) newArr.push(val)
+    }
+    return newArr
+}
+```
+
+## Reduce
+
+```js
+function reduce(arr, init, f) {
+    let acc = init
+    for (const val of arr) {
+        acc = f(acc, val)
+    }
+    return acc
+}
+```
+
+* fold 라는 이름으로도 사용됨
+  + foldLeft, foldRight 같이 탐색 방향에 따른 버전도 있음