[optimisations] prevent some V8 deopt (exit from allowed arguments in…

…dexes)

.eslintrc

@@ -5,7 +5,7 @@
   },
   "rules": {
     "indent": [2, 2, {"VariableDeclarator": 2, "SwitchCase": 1}],
-    "max-len": [2, 100, 2],
+    "max-len": [2, 125, 2],
     "eol-last": 0,
     "camelcase": 2,
     "brace-style": [2, "1tbs", { "allowSingleLine": true }],

library/modules/$.array-copy-within.js

@@ -9,7 +9,8 @@ module.exports = [].copyWithin || function copyWithin(target/*= 0*/, start/*= 0,
     , len   = toLength(O.length)
     , to    = toIndex(target, len)
     , from  = toIndex(start, len)
-    , end   = arguments[2]
+    , $$    = arguments
+    , end   = $$.length > 2 ? $$[2] : undefined
     , count = Math.min((end === undefined ? len : toIndex(end, len)) - from, len - to)
     , inc   = 1;
   if(from < to && to < from + count){

library/modules/$.array-fill.js

@@ -6,8 +6,10 @@ var toObject = require('./$.to-object')
 module.exports = [].fill || function fill(value /*, start = 0, end = @length */){
   var O      = toObject(this, true)
     , length = toLength(O.length)
-    , index  = toIndex(arguments[1], length)
-    , end    = arguments[2]
+    , $$     = arguments
+    , $$len  = $$.length
+    , index  = toIndex($$len > 1 ? $$[1] : undefined, length)
+    , end    = $$len > 2 ? $$[2] : undefined
     , endPos = end === undefined ? length : toIndex(end, length);
   while(endPos > index)O[index++] = value;
   return O;

library/modules/$.assign.js

@@ -14,14 +14,15 @@ module.exports = require('./$.fails')(function(){
   K.split('').forEach(function(k){ B[k] = k; });
   return a({}, A)[S] != 7 || Object.keys(a({}, B)).join('') != K;
 }) ? function assign(target, source){ // eslint-disable-line no-unused-vars
-  var T = toObject(target)
-    , l = arguments.length
-    , i = 1
+  var T     = toObject(target)
+    , $$    = arguments
+    , $$len = $$.length
+    , index = 1
     , getKeys    = $.getKeys
     , getSymbols = $.getSymbols
     , isEnum     = $.isEnum;
-  while(l > i){
-    var S      = IObject(arguments[i++])
+  while($$len > index){
+    var S      = IObject($$[index++])
       , keys   = getSymbols ? getKeys(S).concat(getSymbols(S)) : getKeys(S)
       , length = keys.length
       , j      = 0

library/modules/$.buffer.js

@@ -244,22 +244,22 @@ if(require('./$.support-desc')){
         return get(this, 1, byteOffset, unpackU8);
       },
       getInt16: function getInt16(byteOffset /*, littleEndian */){
-        return get(this, 2, byteOffset, unpackI16, arguments[1]);
+        return get(this, 2, byteOffset, unpackI16, arguments.length > 1 ? arguments[1] : undefined);
       },
       getUint16: function getUint16(byteOffset /*, littleEndian */){
-        return get(this, 2, byteOffset, unpackU16, arguments[1]);
+        return get(this, 2, byteOffset, unpackU16, arguments.length > 1 ? arguments[1] : undefined);
       },
       getInt32: function getInt32(byteOffset /*, littleEndian */){
-        return get(this, 4, byteOffset, unpackI32, arguments[1]);
+        return get(this, 4, byteOffset, unpackI32, arguments.length > 1 ? arguments[1] : undefined);
       },
       getUint32: function getUint32(byteOffset /*, littleEndian */){
-        return get(this, 4, byteOffset, unpackU32, arguments[1]);
+        return get(this, 4, byteOffset, unpackU32, arguments.length > 1 ? arguments[1] : undefined);
       },
       getFloat32: function getFloat32(byteOffset /*, littleEndian */){
-        return get(this, 4, byteOffset, unpackF32, arguments[1]);
+        return get(this, 4, byteOffset, unpackF32, arguments.length > 1 ? arguments[1] : undefined);
       },
       getFloat64: function getFloat64(byteOffset /*, littleEndian */){
-        return get(this, 8, byteOffset, unpackF64, arguments[1]);
+        return get(this, 8, byteOffset, unpackF64, arguments.length > 1 ? arguments[1] : undefined);
       },
       setInt8: function setInt8(byteOffset, value){
         return set(this, 1, byteOffset, packI8, value);
@@ -268,22 +268,22 @@ if(require('./$.support-desc')){
         return set(this, 1, byteOffset, packU8, value);
       },
       setInt16: function setInt16(byteOffset, value /*, littleEndian */){
-        return set(this, 2, byteOffset, packI16, value, arguments[2]);
+        return set(this, 2, byteOffset, packI16, value, arguments.length > 2 ? arguments[2] : undefined);
       },
       setUint16: function setUint16(byteOffset, value /*, littleEndian */){
-        return set(this, 2, byteOffset, packU16, value, arguments[2]);
+        return set(this, 2, byteOffset, packU16, value, arguments.length > 2 ? arguments[2] : undefined);
       },
       setInt32: function setInt32(byteOffset, value /*, littleEndian */){
-        return set(this, 4, byteOffset, packI32, value, arguments[2]);
+        return set(this, 4, byteOffset, packI32, value, arguments.length > 2 ? arguments[2] : undefined);
       },
       setUint32: function setUint32(byteOffset, value /*, littleEndian */){
-        return set(this, 4, byteOffset, packU32, value, arguments[2]);
+        return set(this, 4, byteOffset, packU32, value, arguments.length > 2 ? arguments[2] : undefined);
       },
       setFloat32: function setFloat32(byteOffset, value /*, littleEndian */){
-        return set(this, 4, byteOffset, packF32, value, arguments[2]);
+        return set(this, 4, byteOffset, packF32, value, arguments.length > 2 ? arguments[2] : undefined);
       },
       setFloat64: function setFloat64(byteOffset, value /*, littleEndian */){
-        return set(this, 8, byteOffset, packF64, value, arguments[2]);
+        return set(this, 8, byteOffset, packF64, value, arguments.length > 2 ? arguments[2] : undefined);
       }
     });
   }

library/modules/$.collection-strong.js

@@ -81,7 +81,7 @@ module.exports = {
       // 23.2.3.6 Set.prototype.forEach(callbackfn, thisArg = undefined)
       // 23.1.3.5 Map.prototype.forEach(callbackfn, thisArg = undefined)
       forEach: function forEach(callbackfn /*, that = undefined */){
-        var f = ctx(callbackfn, arguments[1], 3)
+        var f = ctx(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3)
           , entry;
         while(entry = entry ? entry.n : this._f){
           f(entry.v, entry.k, this);

library/modules/$.partial.js

@@ -11,13 +11,14 @@ module.exports = function(/* ...pargs */){
     , holder = false;
   while(length > i)if((pargs[i] = arguments[i++]) === _)holder = true;
   return function(/* ...args */){
-    var that    = this
-      , _length = arguments.length
+    var that  = this
+      , $$    = arguments
+      , $$len = $$.length
       , j = 0, k = 0, args;
-    if(!holder && !_length)return invoke(fn, pargs, that);
+    if(!holder && !$$len)return invoke(fn, pargs, that);
     args = pargs.slice();
-    if(holder)for(;length > j; j++)if(args[j] === _)args[j] = arguments[k++];
-    while(_length > k)args.push(arguments[k++]);
+    if(holder)for(;length > j; j++)if(args[j] === _)args[j] = $$[k++];
+    while($$len > k)args.push($$[k++]);
     return invoke(fn, args, that);
   };
 };

library/modules/$.typed-array.js

@@ -70,7 +70,9 @@ var allocate = function(C, length){
 
 var $from = function from(source /*, mapfn, thisArg */){
   var O       = toObject(source)
-    , mapfn   = arguments[1]
+    , $$      = arguments
+    , $$len   = $$.length
+    , mapfn   = $$len > 1 ? $$[1] : undefined
     , mapping = mapfn !== undefined
     , iterFn  = getIterFn(O)
     , i, length, values, result, step, iterator;
@@ -79,7 +81,7 @@ var $from = function from(source /*, mapfn, thisArg */){
       values.push(step.value);
     } O = values;
   }
-  if(mapping)mapfn = ctx(mapfn, arguments[2], 2);
+  if(mapping && $$len > 2)mapfn = ctx(mapfn, $$[2], 2);
   for(i = 0, length = toLength(O.length), result = allocate(this, length); length > i; i++){
     result[i] = mapping ? mapfn(O[i], i) : O[i];
   }
@@ -106,53 +108,53 @@ var proto = {
   // get length
   // constructor
   copyWithin: function copyWithin(target, start /*, end */){
-    return $copyWithin.call(validate(this), target, start, arguments[2]);
+    return $copyWithin.call(validate(this), target, start, arguments.length > 2 ? arguments[2] : undefined);
   },
   every: function every(callbackfn /*, thisArg */){
-    return $every(validate(this), callbackfn, arguments[1]);
+    return $every(validate(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
   },
-  fill: function fill(value /*, start, end */){
-    return $fill.call(validate(this), value, arguments[1], arguments[2]);
+  fill: function fill(value /*, start, end */){ // eslint-disable-line no-unused-vars
+    return $fill.apply(validate(this), arguments);
   },
   filter: function filter(callbackfn /*, thisArg */){
-    return fromList(this.constructor, $filter(validate(this), callbackfn, arguments[1])); // TMP
+    return fromList(this.constructor, $filter(validate(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined));
   },
   find: function find(predicate /*, thisArg */){
-    return $find(validate(this), predicate, arguments[1]);
+    return $find(validate(this), predicate, arguments.length > 1 ? arguments[1] : undefined);
   },
   findIndex: function findIndex(predicate /*, thisArg */){
-    return $findIndex(validate(this), predicate, arguments[1]);
+    return $findIndex(validate(this), predicate, arguments.length > 1 ? arguments[1] : undefined);
   },
   forEach: function forEach(callbackfn /*, thisArg */){
-    $forEach(validate(this), callbackfn, arguments[1]);
+    $forEach(validate(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
   },
   indexOf: function indexOf(searchElement /*, fromIndex */){
-    return $indexOf(validate(this), searchElement, arguments[1]);
+    return $indexOf(validate(this), searchElement, arguments.length > 1 ? arguments[1] : undefined);
   },
   includes: function includes(searchElement /*, fromIndex */){
-    return $includes(validate(this), searchElement, arguments[1]);
+    return $includes(validate(this), searchElement, arguments.length > 1 ? arguments[1] : undefined);
   },
   join: function join(separator){ // eslint-disable-line no-unused-vars
     return $join.apply(validate(this), arguments);
   },
-  lastIndexOf: function lastIndexOf(searchElement /*, fromIndex */){ // eslint-disable-line
+  lastIndexOf: function lastIndexOf(searchElement /*, fromIndex */){ // eslint-disable-line no-unused-vars
     return $lastIndexOf.apply(validate(this), arguments);
   },
   map: function map(mapfn /*, thisArg */){
-    return fromList(this.constructor, $map(validate(this), mapfn, arguments[1])); // TMP
+    return fromList(this.constructor, $map(validate(this), mapfn, arguments.length > 1 ? arguments[1] : undefined));
   },
-  reduce: function reduce(callbackfn /*, initialValue */){ // eslint-disable-line
+  reduce: function reduce(callbackfn /*, initialValue */){ // eslint-disable-line no-unused-vars
     return $reduce.apply(validate(this), arguments);
   },
-  reduceRight: function reduceRight(callbackfn /*, initialValue */){ // eslint-disable-line
+  reduceRight: function reduceRight(callbackfn /*, initialValue */){ // eslint-disable-line no-unused-vars
     return $reduceRight.apply(validate(this), arguments);
   },
   reverse: function reverse(){
     return $reverse.call(validate(this));
   },
   set: function set(arrayLike /*, offset */){
     validate(this);
-    var offset = toInteger(arguments[1]);
+    var offset = toInteger(arguments.length > 1 ? arguments[1] : undefined);
     if(offset < 0)throw RangeError();
     var length = this.length;
     var src    = toObject(arrayLike);
@@ -165,16 +167,18 @@ var proto = {
     return fromList(this.constructor, $slice.call(validate(this), start, end)); // TODO
   },
   some: function some(callbackfn /*, thisArg */){
-    return $some(validate(this), callbackfn, arguments[1]);
+    return $some(validate(this), callbackfn, arguments.length > 1 ? arguments[1] : undefined);
   },
   sort: function sort(comparefn){
     return $sort.call(validate(this), comparefn);
   },
   subarray: function subarray(/* begin, end */){
     var O      = validate(this)
       , length = O.length
-      , begin  = toIndex(arguments[0], length)
-      , end    = arguments[1];
+      , $$     = arguments
+      , $$len  = $$.length
+      , begin  = toIndex($$len > 0 ? $$[0] : undefined, length)
+      , end    = $$len > 1 ? $$[1] : undefined;
     return new O.constructor( // <- TODO SpeciesConstructor
       O.buffer,
       O.byteOffset + begin * O.BYTES_PER_ELEMENT,

library/modules/es6.array.find-index.js

@@ -8,7 +8,7 @@ var KEY    = 'findIndex'
 if(KEY in [])Array(1)[KEY](function(){ forced = false; });
 $def($def.P + $def.F * forced, 'Array', {
   findIndex: function findIndex(callbackfn/*, that = undefined */){
-    return $find(this, callbackfn, arguments[1]);
+    return $find(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
   }
 });
 require('./$.unscope')(KEY);

library/modules/es6.array.find.js

@@ -8,7 +8,7 @@ var KEY    = 'find'
 if(KEY in [])Array(1)[KEY](function(){ forced = false; });
 $def($def.P + $def.F * forced, 'Array', {
   find: function find(callbackfn/*, that = undefined */){
-    return $find(this, callbackfn, arguments[1]);
+    return $find(this, callbackfn, arguments.length > 1 ? arguments[1] : undefined);
   }
 });
 require('./$.unscope')(KEY);

library/modules/es6.array.from.js

@@ -11,12 +11,14 @@ $def($def.S + $def.F * !require('./$.iter-detect')(function(iter){ Array.from(it
   from: function from(arrayLike/*, mapfn = undefined, thisArg = undefined*/){
     var O       = toObject(arrayLike)
       , C       = typeof this == 'function' ? this : Array
-      , mapfn   = arguments[1]
+      , $$      = arguments
+      , $$len   = $$.length
+      , mapfn   = $$len > 1 ? $$[1] : undefined
       , mapping = mapfn !== undefined
       , index   = 0
       , iterFn  = getIterFn(O)
       , length, result, step, iterator;
-    if(mapping)mapfn = ctx(mapfn, arguments[2], 2);
+    if(mapping)mapfn = ctx(mapfn, $$len > 2 ? $$[2] : undefined, 2);
     // if object isn't iterable or it's array with default iterator - use simple case
     if(iterFn != undefined && !(C == Array && isArrayIter(iterFn))){
       for(iterator = iterFn.call(O), result = new C; !(step = iterator.next()).done; index++){

library/modules/es6.array.of.js

@@ -9,10 +9,11 @@ $def($def.S + $def.F * require('./$.fails')(function(){
   // 22.1.2.3 Array.of( ...items)
   of: function of(/* ...args */){
     var index  = 0
-      , length = arguments.length
-      , result = new (typeof this == 'function' ? this : Array)(length);
-    while(length > index)result[index] = arguments[index++];
-    result.length = length;
+      , $$     = arguments
+      , $$len  = $$.length
+      , result = new (typeof this == 'function' ? this : Array)($$len);
+    while($$len > index)result[index] = $$[index++];
+    result.length = $$len;
     return result;
   }
 });

library/modules/es6.map.js

@@ -3,7 +3,7 @@ var strong = require('./$.collection-strong');
 
 // 23.1 Map Objects
 require('./$.collection')('Map', function(get){
-  return function Map(){ return get(this, arguments[0]); };
+  return function Map(){ return get(this, arguments.length > 0 ? arguments[0] : undefined); };
 }, {
   // 23.1.3.6 Map.prototype.get(key)
   get: function get(key){

library/modules/es6.math.hypot.js

@@ -4,13 +4,14 @@ var $def = require('./$.def')
 
 $def($def.S, 'Math', {
   hypot: function hypot(value1, value2){ // eslint-disable-line no-unused-vars
-    var sum  = 0
-      , i    = 0
-      , len  = arguments.length
-      , larg = 0
+    var sum   = 0
+      , i     = 0
+      , $$    = arguments
+      , $$len = $$.length
+      , larg  = 0
       , arg, div;
-    while(i < len){
-      arg = abs(arguments[i++]);
+    while(i < $$len){
+      arg = abs($$[i++]);
       if(larg < arg){
         div  = larg / arg;
         sum  = sum * div * div + 1;

library/modules/es6.set.js

@@ -3,7 +3,7 @@ var strong = require('./$.collection-strong');
 
 // 23.2 Set Objects
 require('./$.collection')('Set', function(get){
-  return function Set(){ return get(this, arguments[0]); };
+  return function Set(){ return get(this, arguments.length > 0 ? arguments[0] : undefined); };
 }, {
   // 23.2.3.1 Set.prototype.add(value)
   add: function add(value){

library/modules/es6.string.ends-with.js

@@ -9,7 +9,8 @@ var $def      = require('./$.def')
 $def($def.P + $def.F * require('./$.fails-is-regexp')(ENDS_WITH), 'String', {
   endsWith: function endsWith(searchString /*, endPosition = @length */){
     var that = context(this, searchString, ENDS_WITH)
-      , endPosition = arguments[1]
+      , $$   = arguments
+      , endPosition = $$.length > 1 ? $$[1] : undefined
       , len    = toLength(that.length)
       , end    = endPosition === undefined ? len : Math.min(toLength(endPosition), len)
       , search = String(searchString);

library/modules/es6.string.from-code-point.js

@@ -7,12 +7,13 @@ var $def    = require('./$.def')
 $def($def.S + $def.F * (!!$fromCodePoint && $fromCodePoint.length != 1), 'String', {
   // 21.1.2.2 String.fromCodePoint(...codePoints)
   fromCodePoint: function fromCodePoint(x){ // eslint-disable-line no-unused-vars
-    var res = []
-      , len = arguments.length
-      , i   = 0
+    var res   = []
+      , $$    = arguments
+      , $$len = $$.length
+      , i     = 0
       , code;
-    while(len > i){
-      code = +arguments[i++];
+    while($$len > i){
+      code = +$$[i++];
       if(toIndex(code, 0x10ffff) !== code)throw RangeError(code + ' is not a valid code point');
       res.push(code < 0x10000
         ? fromCharCode(code)

library/modules/es6.string.includes.js

@@ -6,6 +6,6 @@ var $def     = require('./$.def')
 
 $def($def.P + $def.F * require('./$.fails-is-regexp')(INCLUDES), 'String', {
   includes: function includes(searchString /*, position = 0 */){
-    return !!~context(this, searchString, INCLUDES).indexOf(searchString, arguments[1]);
+    return !!~context(this, searchString, INCLUDES).indexOf(searchString, arguments.length > 1 ? arguments[1] : undefined);
   }
 });