From 5c223ff7437d0139a4905aeb780aea86d9b03872 Mon Sep 17 00:00:00 2001
From: liuliangsir <2269305724@qq.com>
Date: Tue, 23 Jan 2018 22:58:17 +0800
Subject: [PATCH] Added getMinOrMaxValueInArrayBySomeRules utility function

---
 .../getMinOrMaxValueInArrayBySomeRules.md     | 25 +++++++++++++++++++
 1 file changed, 25 insertions(+)
 create mode 100644 snippets/getMinOrMaxValueInArrayBySomeRules.md

diff --git a/snippets/getMinOrMaxValueInArrayBySomeRules.md b/snippets/getMinOrMaxValueInArrayBySomeRules.md
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+++ b/snippets/getMinOrMaxValueInArrayBySomeRules.md
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+### getMinOrMaxValueInArrayBySomeRules
+
+By setting some rules, get Minimum or Maximum value in array .
+
+BTW, the Minimum / Maximum value could be `Object`, namely, the upper array could be a `Object` array(filled with `Object`).
+
+```js
+const getMinOrMaxValueInArrayBySomeRules = (xs, comparator = (a, b) => a - b) => xs.reduce(function (a, b) {
+    return comparator(a, b) >= 0 ? b : a;
+});
+```
+
+```js
+// get minimum value from numeric array
+getMinOrMaxValueInArrayBySomeRules([1, 3, 2]); // 1
+
+// get maximum value from numeric array
+getMinOrMaxValueInArrayBySomeRules([1, 3, 2], function (a, b) {return b - a;}); // 3
+
+// get minimum value from object array by a given key map to value
+getMinOrMaxValueInArrayBySomeRules([{name: 'Tom', age: 12}, {name: 'Jack', age: 18}, {name: 'Lucy', age: 9}], function(a, b){return a.age - b.age;}) // {name: "Lucy", age: 9}
+
+// get maximum value from object array by a given key map to value
+getMinOrMaxValueInArrayBySomeRules([{name: 'Tom', age: 12}, {name: 'Jack', age: 18}, {name: 'Lucy', age: 9}], function(a, b){return a.age - b.age;}) // {name: "Jack", age: 18}
+```
\ No newline at end of file