From 2cff305f462da53a681bc47a84e77e3abd991335 Mon Sep 17 00:00:00 2001
From: Chris Troutner <chris.troutner@gmail.com>
Date: Sat, 13 Feb 2021 14:59:33 -0800
Subject: [PATCH] feat(floor2): bchjs.Util.floor2(num) - round down to 2
 decimal places

---
 src/util.js       | 35 +++++++++++++++++++++++++++++++++++
 test/unit/util.js | 33 +++++++++++++++++++++++++++++++++
 2 files changed, 68 insertions(+)

diff --git a/src/util.js b/src/util.js
index 441480d..d8fc064 100644
--- a/src/util.js
+++ b/src/util.js
@@ -62,6 +62,41 @@ class Util {
     return tempNum
   }
 
+  /**
+   * @api util.floor2() floor2()
+   * @apiName floor2
+   * @apiGroup Util
+   * @apiDescription Round a number down to 2 decimal places.
+   *
+   *
+   * @apiExample Example usage:
+   * (async () => {
+   *   try {
+   *     const num = 1.234567891111
+   *     const result = bchjs.Util.floor2(num)
+   *     console.log(result)
+   *   } catch(error) {
+   *    console.error(error)
+   *   }
+   * })()
+   *
+   * // returns
+   *  1.23
+   */
+  // floor2 - round down to 2 decimal places
+  // Takes a number and returns it, rounded to the nearest 2 decimal place.
+  floor2 (num) {
+    const thisNum = Number(num)
+
+    if (isNaN(thisNum)) throw new Error('input must be a number')
+
+    let tempNum = thisNum * 100
+    tempNum = Math.floor(tempNum)
+    tempNum = tempNum / 100
+
+    return tempNum
+  }
+
   /**
    * @api util.validateAddress() validateAddress()
    * @apiName Validate Address.
diff --git a/test/unit/util.js b/test/unit/util.js
index 55562e0..09ffcaa 100644
--- a/test/unit/util.js
+++ b/test/unit/util.js
@@ -66,4 +66,37 @@ describe('#Util', () => {
       assert2.equal(result, 1.23)
     })
   })
+
+  describe('#floor2', () => {
+    it('should round a number to 2 decimals', () => {
+      const num = 1.234567891111
+
+      const result = bchjs.Util.floor2(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.23)
+    })
+
+    it('should throw an error for non-number input', () => {
+      try {
+        const num = 'string'
+
+        bchjs.Util.floor2(num)
+
+        assert2.equal(true, false, 'Unexpected result')
+      } catch (err) {
+        // console.log(err)
+        assert2.include(err.message, 'input must be a number')
+      }
+    })
+
+    it('should not effect a number with less than 8 decimals', () => {
+      const num = 1.2
+
+      const result = bchjs.Util.floor2(num)
+      // console.log(result)
+
+      assert2.equal(result, 1.2)
+    })
+  })
 })