Merge pull request #32 from luxp/es

Add ES Moudule output

build/index.es.js

@@ -0,0 +1,128 @@
+/**
+ * @desc 解决浮动运算问题，避免小数点后产生多位数和计算精度损失。
+ * 问题示例：2.3 + 2.4 = 4.699999999999999，1.0 - 0.9 = 0.09999999999999998
+ */
+/**
+ * 把错误的数据转正
+ * strip(0.09999999999999998)=0.1
+ */
+function strip(num, precision) {
+    if (precision === void 0) { precision = 12; }
+    return +parseFloat(num.toPrecision(precision));
+}
+/**
+ * Return digits length of a number
+ * @param {*number} num Input number
+ */
+function digitLength(num) {
+    // Get digit length of e
+    var eSplit = num.toString().split(/[eE]/);
+    var len = (eSplit[0].split('.')[1] || '').length - (+(eSplit[1] || 0));
+    return len > 0 ? len : 0;
+}
+/**
+ * 把小数转成整数，支持科学计数法。如果是小数则放大成整数
+ * @param {*number} num 输入数
+ */
+function float2Fixed(num) {
+    if (num.toString().indexOf('e') === -1) {
+        return Number(num.toString().replace('.', ''));
+    }
+    var dLen = digitLength(num);
+    return dLen > 0 ? strip(num * Math.pow(10, dLen)) : num;
+}
+/**
+ * 检测数字是否越界，如果越界给出提示
+ * @param {*number} num 输入数
+ */
+function checkBoundary(num) {
+    if (_boundaryCheckingState) {
+        if (num > Number.MAX_SAFE_INTEGER || num < Number.MIN_SAFE_INTEGER) {
+            console.warn(num + " is beyond boundary when transfer to integer, the results may not be accurate");
+        }
+    }
+}
+/**
+ * 精确乘法
+ */
+function times(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return times.apply(void 0, [times(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    var baseNum = digitLength(num1) + digitLength(num2);
+    var leftValue = num1Changed * num2Changed;
+    checkBoundary(leftValue);
+    return leftValue / Math.pow(10, baseNum);
+}
+/**
+ * 精确加法
+ */
+function plus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return plus.apply(void 0, [plus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) + times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确减法
+ */
+function minus(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return minus.apply(void 0, [minus(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var baseNum = Math.pow(10, Math.max(digitLength(num1), digitLength(num2)));
+    return (times(num1, baseNum) - times(num2, baseNum)) / baseNum;
+}
+/**
+ * 精确除法
+ */
+function divide(num1, num2) {
+    var others = [];
+    for (var _i = 2; _i < arguments.length; _i++) {
+        others[_i - 2] = arguments[_i];
+    }
+    if (others.length > 0) {
+        return divide.apply(void 0, [divide(num1, num2), others[0]].concat(others.slice(1)));
+    }
+    var num1Changed = float2Fixed(num1);
+    var num2Changed = float2Fixed(num2);
+    checkBoundary(num1Changed);
+    checkBoundary(num2Changed);
+    // fix: 类似 10 ** -4 为 0.00009999999999999999，strip 修正
+    return times((num1Changed / num2Changed), strip(Math.pow(10, digitLength(num2) - digitLength(num1))));
+}
+/**
+ * 四舍五入
+ */
+function round(num, ratio) {
+    var base = Math.pow(10, ratio);
+    return divide(Math.round(times(num, base)), base);
+}
+var _boundaryCheckingState = true;
+/**
+ * 是否进行边界检查，默认开启
+ * @param flag 标记开关，true 为开启，false 为关闭，默认为 true
+ */
+function enableBoundaryChecking(flag) {
+    if (flag === void 0) { flag = true; }
+    _boundaryCheckingState = flag;
+}
+var index = { strip: strip, plus: plus, minus: minus, times: times, divide: divide, round: round, digitLength: digitLength, float2Fixed: float2Fixed, enableBoundaryChecking: enableBoundaryChecking };
+
+export { strip, plus, minus, times, divide, round, digitLength, float2Fixed, enableBoundaryChecking };
+export default index;

package.json

@@ -3,6 +3,7 @@
   "version": "1.3.2",
   "description": "Perform addition, subtraction, multiplication and division operations precisely using javascript",
   "main": "build/index.js",
+  "module": "build/index.es.js",
   "types": "src/index.ts",
   "author": "cam song",
   "keywords": [

rollup.config.js

@@ -1,20 +1,26 @@
-import typescript from 'rollup-plugin-typescript2';
+import typescript from 'rollup-plugin-typescript2'
 
 export default {
   input: './src/index.ts',
-  output: [{
-    format: 'iife',
-    name: 'NP',
-    dest: './build/index.iife.js',
-  }, {
-    format: 'umd',
-    name: 'NP',
-    dest: './build/index.umd.js',
-  }, {
-    format: 'cjs',
-    dest: './build/index.js',
-  }],
-  plugins: [
-    typescript()
-  ]
-};
+  output: [
+    {
+      format: 'iife',
+      name: 'NP',
+      dest: './build/index.iife.js'
+    },
+    {
+      format: 'umd',
+      name: 'NP',
+      dest: './build/index.umd.js'
+    },
+    {
+      format: 'cjs',
+      dest: './build/index.js'
+    },
+    {
+      format: 'es',
+      dest: './build/index.es.js'
+    }
+  ],
+  plugins: [typescript()]
+}