calculate-asmd - npm Package Compare versions

Comparing version 1.0.0 to 2.0.0

index.js

@@ -1,28 +0,23 @@
-'use strict';
-/** 
-    除法
+"use strict";
+/**
+  加法
 **/
-function acctDiv(arg1, arg2){
-  var r1 = Number(arg1.toString().replace(".", ""));
-  var r2 = Number(arg2.toString().replace(".", ""));
-  var l1 = 0;
-  var l2 = 0;
+function add(arg1, arg2) {
+  var r1 = 0;
+  var r2 = 0;
+  var m = 0;
   try {
-      l1 =  Number(arg1.toString().split(".")[1].length);
+    r1 = arg1.toString().split(".")[1].length;
   } catch (e) {
-      l1 = 0;
+    r1 = 0;
   }
 
   try {
-      l2 = Number(arg2.toString().split(".")[1].length);
+    r2 = arg2.toString().split(".")[1].length;
   } catch (e) {
-      l2 = 0;
+    r2 = 0;
   }
 
-  var pow = Math.pow(10, Math.max(l1, l2));
-  //var result =  (Number(r1) / Number(r2)) * Math.pow(10, l2 - l1);  这样也会出现精度问题
-
-  //先把结果放大一定倍数，再去移动相应位数
-  var result = r1 / r2;
-  result = result * pow * Math.pow(10, l2 - l1) / pow;
+  m = Math.pow(10, Math.max(r1, r2));
+  var result = (arg1 * m + arg2 * m) / m;
   return result;
@@ -32,21 +27,22 @@ }
 /**
-  乘法
+  减法
 **/
-function acctMul(arg1, arg2){
-  var r1 = Number(arg1.toString().replace(".", ""));
-  var r2 = Number(arg2.toString().replace(".", ""));
+function sub(arg1, arg2) {
+  var r1 = 0;
+  var r2 = 0;
   var m = 0;
-
   try {
-      m += arg1.toString().split(".")[1].length;
+    r1 = arg1.toString().split(".")[1].length;
   } catch (e) {
-      m += 0;
+    r1 = 0;
   }
 
   try {
-      m += arg2.toString().split(".")[1].length;
+    r2 = arg2.toString().split(".")[1].length;
   } catch (e) {
-      m += 0;
+    r2 = 0;
   }
-  var result = (r1 * r2) / Math.pow(10, m);
+
+  m = Math.pow(10, Math.max(r1, r2));
+  var result = (arg1 * m - arg2 * m) / m;
   return result;
@@ -56,49 +52,53 @@ }
 /**
-  加法
+  乘法
 **/
-function acctAdd(arg1, arg2){
-  var r1 = 0;
-  var r2 = 0;
+function mul(arg1, arg2) {
+  var r1 = Number(arg1.toString().replace(".", ""));
+  var r2 = Number(arg2.toString().replace(".", ""));
   var m = 0;
+
   try {
-      r1 = arg1.toString().split(".")[1].length;
+    m += arg1.toString().split(".")[1].length;
   } catch (e) {
-      r1 = 0;
+    m += 0;
   }
 
   try {
-      r2 = arg2.toString().split(".")[1].length;
+    m += arg2.toString().split(".")[1].length;
   } catch (e) {
-      r2 = 0;
+    m += 0;
   }
-
-  m = Math.pow(10, Math.max(r1, r2));
-  var result = (arg1 * m + arg2 * m) / m;
+  var result = (r1 * r2) / Math.pow(10, m);
   return result;
 }
 
-/**
-  减法
+/** 
+    除法
 **/
-function acctSub(arg1, arg2){
-  var r1 = 0;
-  var r2 = 0;
-  var m = 0;
+function div(arg1, arg2) {
+  var r1 = Number(arg1.toString().replace(".", ""));
+  var r2 = Number(arg2.toString().replace(".", ""));
+  var l1 = 0;
+  var l2 = 0;
   try {
-      r1 = arg1.toString().split(".")[1].length;
+    l1 = Number(arg1.toString().split(".")[1].length);
   } catch (e) {
-      r1 = 0;
+    l1 = 0;
   }
 
   try {
-      r2 = arg2.toString().split(".")[1].length;
+    l2 = Number(arg2.toString().split(".")[1].length);
   } catch (e) {
-      r2 = 0;
+    l2 = 0;
   }
 
-  m = Math.pow(10, Math.max(r1, r2));
-  var result = (arg1 * m - arg2 * m) / m;
+  var pow = Math.pow(10, Math.max(l1, l2));
+  //var result =  (Number(r1) / Number(r2)) * Math.pow(10, l2 - l1);  这样也会出现精度问题
+
+  //先把结果放大一定倍数，再去移动相应位数
+  var result = r1 / r2;
+  result = (result * pow * Math.pow(10, l2 - l1)) / pow;
   return result;
 }
 
-module.exports = {acctDiv,acctMul,acctAdd,acctSub}
+module.exports = { add, sub, mul, div };

package.json

 {
   "name": "calculate-asmd",
-  "version": "1.0.0",
-  "description": "加减乘除四则运算",
+  "version": "2.0.0",
+  "description": "加减乘除四则运算(calculate/arithmetic)",
   "main": "index.js",
@@ -9,8 +9,16 @@ "author": "sanshuiwang",
   "scripts": {
-    "start": "http-server -a 127.0.0.1 -p 7070",
     "test": "node ./test/test.js"
   },
-  "devDependencies": {
-    "http-server": "^0.11.1"
-  }
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/sanshuiwang/calculate-asmd.git"
+  },
+  "keywords": [
+    "calculate",
+    "arithmetic"
+  ],
+  "bugs": {
+    "url": "https://github.com/sanshuiwang/calculate-asmd/issues"
+  },
+  "homepage": "https://github.com/sanshuiwang/calculate-asmd#readme"
 }

README.md

 # calculate-asmd
-javascript精确四则运算
+
+<h3>javascript 精确四则运算</h3>
+
+> 生产原因
+
+1. 浮点数值的最高进度是 17 位小数，但在进行运算的时候其精确度却远远不如整数；整数在进行运算的时候都会转成 10 进制。
+2. Java 和 JavaScript 中计算小数运算时，都会先将十进制的小数换算到对应的二进制，一部分小数并不能完整的换算为二进制，这里就出现了第一次的误差。
+3. 待小数都换算为二进制后，再进行二进制间的运算，得到二进制结果。然后再将二进制结果换算为十进制，这里通常会出现第二次的误差。
+
+> 使用
+
+<h4>安装</h4>
+
+`yarn add calculate-asmd --dev`
+
+or
+
+`npm install calculate-asmd --save-dev`
+
+<h4>Demo</h4>
+
+```
+import { add, sub, mul, div } from 'calculate-asmd'
+
+/** 加法 */
+  const addNum = add(9.9, 0.2);
+  console.log("add: ", addNum);
+
+/** 减法 */
+  const subNum = sub(9.9, 0.2);
+  console.log("sub: ", subNum);
+
+/** 乘法 */
+  const mulNum = mul(9.9, 0.2);
+  console.log("mul: ", mulNum);
+
+/** 除法 */
+  const divNum = div(9.9, 0.2);
+  console.log("div: ", divNum);
+
+```
+
+> 参考
+
+[精确四则运算](https://blog.csdn.net/u010004317/article/details/79009172)
+
+[js 小数运算出现多位小数如何解决
+](http://www.cnblogs.com/zdz8207/p/js-number-tofixed.html)

test/test.js

@@ -1,8 +0,15 @@
-var calculate = require('../index.js');
+const { add, sub, mul, div } = require("../index.js");
 try {
-  var s = calculate.acctAdd(1,2)
-  console.log(1000,s);
+  const addNum = add(9.9, 0.2);
+  console.log("add: ", addNum);
+  const subNum = sub(9.9, 0.2);
+  console.log("sub: ", subNum);
+
+  const mulNum = mul(9.9, 0.2);
+  console.log("mul: ", mulNum);
+  const divNum = div(9.9, 0.2);
+  console.log("div: ", divNum);
 } catch (error) {
-  console.log(4000, error)
-  throw new Error('The test does not pass...');
+  console.error("error: ", error);
+  throw new Error("The test does not pass...");
 }

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Total package byte prevSize

4172

increased by67.89%

Dev dependency count

0

decreased by-100%

Lines of code

103

increased by6.19%

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Number of lines in readme file

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