Add _.divide and _.multiply.

fp/_mapping.js

@@ -52,23 +52,23 @@ exports.aryMethod = {
     'add', 'after', 'ary', 'assign', 'assignIn', 'at', 'before', 'bind', 'bindKey',
     'chunk', 'cloneDeepWith', 'cloneWith', 'concat', 'countBy', 'curryN',
     'curryRightN', 'debounce', 'defaults', 'defaultsDeep', 'delay', 'difference',
-    'drop', 'dropRight', 'dropRightWhile', 'dropWhile', 'endsWith', 'eq', 'every',
-    'filter', 'find', 'find', 'findIndex', 'findKey', 'findLast', 'findLastIndex',
-    'findLastKey', 'flatMap', 'flatMapDeep', 'flattenDepth', 'forEach', 'forEachRight',
-    'forIn', 'forInRight', 'forOwn', 'forOwnRight', 'get', 'groupBy', 'gt', 'gte',
-    'has', 'hasIn', 'includes', 'indexOf', 'intersection', 'invertBy', 'invoke',
-    'invokeMap', 'isEqual', 'isMatch', 'join', 'keyBy', 'lastIndexOf', 'lt', 'lte',
-    'map', 'mapKeys', 'mapValues', 'matchesProperty', 'maxBy', 'merge', 'minBy',
-    'omit', 'omitBy', 'overArgs', 'pad', 'padEnd', 'padStart', 'parseInt', 'partial',
-    'partialRight', 'partition', 'pick', 'pickBy', 'pull', 'pullAll', 'pullAt',
-    'random', 'range', 'rangeRight', 'rearg', 'reject', 'remove', 'repeat',
-    'restFrom', 'result', 'sampleSize', 'some', 'sortBy', 'sortedIndex',
-    'sortedIndexOf', 'sortedLastIndex', 'sortedLastIndexOf', 'sortedUniqBy',
-    'split', 'spreadFrom', 'startsWith', 'subtract', 'sumBy', 'take', 'takeRight',
-    'takeRightWhile', 'takeWhile', 'tap', 'throttle', 'thru', 'times', 'trimChars',
-    'trimCharsEnd', 'trimCharsStart', 'truncate', 'union', 'uniqBy', 'uniqWith',
-    'unset', 'unzipWith', 'without', 'wrap', 'xor', 'zip', 'zipObject',
-    'zipObjectDeep'
+    'divide', 'drop', 'dropRight', 'dropRightWhile', 'dropWhile', 'endsWith',
+    'eq', 'every', 'filter', 'find', 'find', 'findIndex', 'findKey', 'findLast',
+    'findLastIndex', 'findLastKey', 'flatMap', 'flatMapDeep', 'flattenDepth',
+    'forEach', 'forEachRight', 'forIn', 'forInRight', 'forOwn', 'forOwnRight',
+    'get', 'groupBy', 'gt', 'gte', 'has', 'hasIn', 'includes', 'indexOf',
+    'intersection', 'invertBy', 'invoke', 'invokeMap', 'isEqual', 'isMatch',
+    'join', 'keyBy', 'lastIndexOf', 'lt', 'lte', 'map', 'mapKeys', 'mapValues',
+    'matchesProperty', 'maxBy', 'merge', 'minBy', 'multiply', 'omit', 'omitBy',
+    'overArgs', 'pad', 'padEnd', 'padStart', 'parseInt', 'partial', 'partialRight',
+    'partition', 'pick', 'pickBy', 'pull', 'pullAll', 'pullAt', 'random', 'range',
+    'rangeRight', 'rearg', 'reject', 'remove', 'repeat', 'restFrom', 'result',
+    'sampleSize', 'some', 'sortBy', 'sortedIndex', 'sortedIndexOf', 'sortedLastIndex',
+    'sortedLastIndexOf', 'sortedUniqBy', 'split', 'spreadFrom', 'startsWith',
+    'subtract', 'sumBy', 'take', 'takeRight', 'takeRightWhile', 'takeWhile', 'tap',
+    'throttle', 'thru', 'times', 'trimChars', 'trimCharsEnd', 'trimCharsStart',
+    'truncate', 'union', 'uniqBy', 'uniqWith', 'unset', 'unzipWith', 'without',
+    'wrap', 'xor', 'zip', 'zipObject', 'zipObjectDeep'
   ],
   '3': [
     'assignInWith', 'assignWith', 'clamp', 'differenceBy', 'differenceWith',
@@ -248,12 +248,14 @@ exports.skipRearg = {
   'assignIn': true,
   'concat': true,
   'difference': true,
+  'divide': true,
   'gt': true,
   'gte': true,
   'lt': true,
   'lte': true,
   'matchesProperty': true,
   'merge': true,
+  'multiply': true,
   'partial': true,
   'partialRight': true,
   'random': true,

lodash.js

@@ -1074,6 +1074,29 @@
     return result;
   }
 
+  /**
+   * Creates a function that performs a mathematical operation on two values.
+   *
+   * @private
+   * @param {Function} operator The function to perform the operation.
+   * @returns {Function} Returns the new mathematical operation function.
+   */
+  function createMathOperation(operator) {
+    return function(value, other) {
+      var result;
+      if (value === undefined && other === undefined) {
+        return 0;
+      }
+      if (value !== undefined) {
+        result = value;
+      }
+      if (other !== undefined) {
+        result = result === undefined ? other : operator(result, other);
+      }
+      return result;
+    };
+  }
+
   /**
    * Used by `_.deburr` to convert latin-1 supplementary letters to basic latin letters.
    *
@@ -14615,19 +14638,9 @@
      * _.add(6, 4);
      * // => 10
      */
-    function add(augend, addend) {
-      var result;
-      if (augend === undefined && addend === undefined) {
-        return 0;
-      }
-      if (augend !== undefined) {
-        result = augend;
-      }
-      if (addend !== undefined) {
-        result = result === undefined ? addend : (result + addend);
-      }
-      return result;
-    }
+    var add = createMathOperation(function(augend, addend) {
+      return augend + addend;
+    });
 
     /**
      * Computes `number` rounded up to `precision`.
@@ -14652,6 +14665,25 @@
      */
     var ceil = createRound('ceil');
 
+    /**
+     * Divide two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Math
+     * @param {number} dividend The first number in a division.
+     * @param {number} divisor The second number in a division.
+     * @returns {number} Returns the quotient.
+     * @example
+     *
+     * _.divide(6, 4);
+     * // => 1.5
+     */
+    var divide = createMathOperation(function(dividend, divisor) {
+      return dividend / divisor;
+    });
+
     /**
      * Computes `number` rounded down to `precision`.
      *
@@ -14799,6 +14831,25 @@
         : undefined;
     }
 
+    /**
+     * Multiply two numbers.
+     *
+     * @static
+     * @memberOf _
+     * @since 4.7.0
+     * @category Math
+     * @param {number} multiplier The first number in a multiplication.
+     * @param {number} multiplicand The second number in a multiplication.
+     * @returns {number} Returns the product.
+     * @example
+     *
+     * _.multiply(6, 4);
+     * // => 24
+     */
+    var multiply = createMathOperation(function(multiplier, multiplicand) {
+      return multiplier * multiplicand;
+    });
+
     /**
      * Computes `number` rounded to `precision`.
      *
@@ -14837,19 +14888,9 @@
      * _.subtract(6, 4);
      * // => 2
      */
-    function subtract(minuend, subtrahend) {
-      var result;
-      if (minuend === undefined && subtrahend === undefined) {
-        return 0;
-      }
-      if (minuend !== undefined) {
-        result = minuend;
-      }
-      if (subtrahend !== undefined) {
-        result = result === undefined ? subtrahend : (result - subtrahend);
-      }
-      return result;
-    }
+    var subtract = createMathOperation(function(minuend, subtrahend) {
+      return minuend - subtrahend;
+    });
 
     /**
      * Computes the sum of the values in `array`.
@@ -15076,6 +15117,7 @@
     lodash.cloneDeepWith = cloneDeepWith;
     lodash.cloneWith = cloneWith;
     lodash.deburr = deburr;
+    lodash.divide = divide;
     lodash.endsWith = endsWith;
     lodash.eq = eq;
     lodash.escape = escape;
@@ -15155,6 +15197,7 @@
     lodash.mean = mean;
     lodash.min = min;
     lodash.minBy = minBy;
+    lodash.multiply = multiply;
     lodash.noConflict = noConflict;
     lodash.noop = noop;
     lodash.now = now;

test/test-fp.js

@@ -929,7 +929,7 @@
     var func = fp[methodName],
         isAdd = methodName == 'add';
 
-    QUnit.test('`fp.' + methodName + '` should have `rearg` applied', function(assert) {
+    QUnit.test('`fp.' + methodName + '` should not have `rearg` applied', function(assert) {
       assert.expect(1);
 
       assert.strictEqual(func('1')('2'), isAdd ? '12' : -1);
@@ -1021,6 +1021,21 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('fp.divide and fp.multiply');
+
+  _.each(['divide', 'multiply'], function(methodName) {
+    var func = fp[methodName],
+        isDivide = methodName == 'divide';
+
+    QUnit.test('`fp.' + methodName + '` should not have `rearg` applied', function(assert) {
+      assert.expect(1);
+
+      assert.strictEqual(func('2')('4'), isDivide ? 0.5 : 8);
+    });
+  });
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('fp.extend');
 
   (function() {

test/test.js

@@ -24677,11 +24677,13 @@
 
   (function() {
     var funcs = [
+      'add',
       'camelCase',
       'capitalize',
       'ceil',
       'clone',
       'deburr',
+      'divide',
       'endsWith',
       'escape',
       'escapeRegExp',
@@ -24731,6 +24733,7 @@
       'maxBy',
       'min',
       'minBy',
+      'multiply',
       'pad',
       'padEnd',
       'padStart',
@@ -24749,6 +24752,7 @@
       'some',
       'startCase',
       'startsWith',
+      'subtract',
       'sum',
       'toInteger',
       'toLower',
@@ -24770,9 +24774,7 @@
         assert.expect(1);
 
         if (!isNpm) {
-          var array = [1, 2, 3],
-              actual = _(array)[methodName]();
-
+          var actual = _()[methodName]();
           assert.notOk(actual instanceof _);
         }
         else {
@@ -24784,9 +24786,7 @@
         assert.expect(1);
 
         if (!isNpm) {
-          var array = [1, 2, 3],
-              actual = _(array).chain()[methodName]();
-
+          var actual = _().chain()[methodName]();
           assert.ok(actual instanceof _);
         }
         else {
@@ -25012,7 +25012,7 @@
     var acceptFalsey = lodashStable.difference(allMethods, rejectFalsey);
 
     QUnit.test('should accept falsey arguments', function(assert) {
-      assert.expect(305);
+      assert.expect(307);
 
       var emptyArrays = lodashStable.map(falsey, alwaysEmptyArray);