Reduce underscore build size.

Former-commit-id: 207d4ab49063483245dc951d4646413d6d4a1903

build.js

@@ -630,7 +630,7 @@
       return source;
     }
     // remove function
-    source = source.replace(matchFunction(source, funcName), '');
+    source = source.replace(snippet, '');
 
     // grab the method assignments snippet
     snippet = getMethodAssignments(source);
@@ -1054,6 +1054,11 @@
         // replace `arrayLikeClasses` in `_.isEqual`
         source = source.replace(/(?: *\/\/.*\n)*( +)var isArr *= *arrayLikeClasses[^}]+}/, '$1var isArr = isArray(a);');
 
+        // remove "exit early" feature from `_.each`
+        source = source.replace(/( )+var baseIteratorOptions *=[\s\S]+?\n\1.+?;/, function(match) {
+          return match.replace(/if *\(callback[^']+/, 'callback(value, index, collection)');
+        });
+
         // remove `deep` clone functionality
         source = source.replace(/( +)function clone[\s\S]+?\n\1}/, [
           '  function clone(value) {',
@@ -1094,6 +1099,15 @@
       source = buildTemplate(templatePattern, templateSettings);
     }
     else {
+      // simplify template snippets by removing unnecessary brackets
+      source = source.replace(
+        RegExp("{(\\\\n' *\\+\\s*.*?\\+\\n\\s*' *)}(?:\\\\n)?' *([,\\n])", 'g'), "$1'$2"
+      );
+
+      source = source.replace(
+        RegExp("{(\\\\n' *\\+\\s*.*?\\+\\n\\s*' *)}(?:\\\\n)?' *\\+", 'g'), "$1;\\n'+"
+      );
+
       // remove methods from the build
       allMethods.forEach(function(otherName) {
         if (!_.contains(buildMethods, otherName)) {

build/pre-compile.js

@@ -274,7 +274,7 @@
     // remove whitespace from string literals
     source = source.replace(/'(?:(?=(\\?))\1.)*?'/g, function(string) {
       // avoids removing the '\n' of the `stringEscapes` object
-      return string.replace(/\[object |delete |else if|else var |function | in |return\s+[\w']|throw |typeof |use strict|var |@ |'\\n'|\\\\n|\\n|\s+/g, function(match) {
+      return string.replace(/\[object |delete |else |function | in |return\s+[\w']|throw |typeof |use strict|var |@ |'\\n'|\\\\n|\\n|\s+/g, function(match) {
         return match == false || match == '\\n' ? '' : match;
       });
     });

lodash.js

@@ -667,11 +667,13 @@
   function createCallback(func, thisArg) {
     if (!func) {
       return identity;
-    } else if (typeof func != 'function') {
+    }
+    if (typeof func != 'function') {
       return function(object) {
         return object[func];
-      }
-    } else if (thisArg !== undefined) {
+      };
+    }
+    if (thisArg !== undefined) {
       return function(value, index, object) {
         return func.call(thisArg, value, index, object);
       };
@@ -1693,13 +1695,10 @@
    * // => ['one', 'two', 'three'] (order is not guaranteed)
    */
   var keys = !nativeKeys ? shimKeys : function(object) {
-    var type = typeof object;
-
     // avoid iterating over the `prototype` property
-    if (type == 'function' && propertyIsEnumerable.call(object, 'prototype')) {
-      return shimKeys(object);
-    }
-    return nativeKeys(object);
+    return typeof object == 'function' && propertyIsEnumerable.call(object, 'prototype')
+      ? shimKeys(object)
+      : nativeKeys(object);
   };
 
   /**

test/test-build.js

@@ -436,7 +436,7 @@
       console.log(e);
       pass = false;
     }
-    equal(pass, true, methodName + ': ' + message);
+    equal(pass, true, '_.' + methodName + ': ' + message);
   }
 
   /*--------------------------------------------------------------------------*/
@@ -545,17 +545,25 @@
       var start = _.after(2, _.once(QUnit.start));
 
       build(['-s', 'underscore'], function(source, filepath) {
-        var array = [{ 'a': 1 }],
+        var last,
+            array = [{ 'value': 1 }, { 'value': 2 }],
             basename = path.basename(filepath, '.js'),
             context = createContext();
 
         vm.runInContext(source, context);
         var lodash = context._;
 
-        var object = { 'fn': lodash.bind(function(x) { return this.x + x; }, { 'x': 1 }, 1) };
-        equal(object.fn(), 2, 'bind: ' + basename);
+        lodash.each(array, function(value) {
+          last = value;
+          return false;
+        });
 
-        ok(lodash.clone(array, true)[0] === array[0], 'clone: ' + basename);
+        equal(last.value, 2, '_.each: ' + basename);
+
+        var object = { 'fn': lodash.bind(function(x) { return this.x + x; }, { 'x': 1 }, 1) };
+        equal(object.fn(), 2, '_.bind: ' + basename);
+
+        ok(lodash.clone(array, true)[0] === array[0], '_.clone: ' + basename);
         start();
       });
     });
@@ -570,7 +578,7 @@
         vm.runInContext(source, context);
         var lodash = context._;
 
-        equal(lodash.partial(_.identity, 2)(), 2, 'partial: ' + basename);
+        equal(lodash.partial(_.identity, 2)(), 2, '_.partial: ' + basename);
         start();
       });
     });