From 0428728578aa62fdfffed34852ebb4eed5159219 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E6=84=9A=E4=BA=BA=E7=A0=81=E5=A4=B4?= <feiwen8772@qq.com>
Date: Thu, 21 Dec 2017 22:09:55 +0800
Subject: [PATCH] Add numberWithCommas
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
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Use commas to separate digits。
---
 snippets/numberWithCommas.md | 19 +++++++++++++++++++
 tag_database                 |  1 +
 2 files changed, 20 insertions(+)
 create mode 100644 snippets/numberWithCommas.md

diff --git a/snippets/numberWithCommas.md b/snippets/numberWithCommas.md
new file mode 100644
index 000000000..afb8a7f08
--- /dev/null
+++ b/snippets/numberWithCommas.md
@@ -0,0 +1,19 @@
+### numberWithCommas
+
+Use commas to separate digits。
+
+Use `toString()` to convert the number `num` to a string, then use `/\B(?=(\d{3})+(?!\d))/g` to separate every three characters with a comma,except word boundary。
+
+ ```js
+const toThousands = (num) => {
+  let cleanNum = num.toString().split('').filter(n => '0123456789.'.includes(n)).join('') 
+  let wholeNum = cleanNum.split('.')[0].replace(/\B(?=(\d{3})+(?!\d))/g, ",")
+  let decNum = `.${cleanNum.split('.')[1]}`
+  return wholeNum + decNum;
+}
+
+// toThousands(12305030388.9087) //-> '12,305,030,388.9087'
+// toThousands(123.889087e2) //-> '12,388.9087'
+// toThousands('12305030388.9087') //-> '12,305,030,388.9087'
+// toThousands('12305abc030388.9087') // -> '12,305,030,388.9087'
+```
diff --git a/tag_database b/tag_database
index bc9f671f3..17c6ab438 100644
--- a/tag_database
+++ b/tag_database
@@ -123,3 +123,4 @@ without:array
 words:string
 zip:array
 zipObject:array
+numberWithCommas:utility
\ No newline at end of file