Editorial: Bring {%TA%,Array}#join() and Array#toLocaleString() in sy…

…nc (#3181)

These three basically implement the same algorithm, but had minor differences in structure and variable names.

spec.html

@@ -39233,8 +39233,9 @@ <h1>Array.prototype.join ( _separator_ )</h1>
           1. Repeat, while _k_ &lt; _len_,
             1. If _k_ > 0, set _R_ to the string-concatenation of _R_ and _sep_.
             1. Let _element_ be ? Get(_O_, ! ToString(𝔽(_k_))).
-            1. If _element_ is either *undefined* or *null*, let _next_ be the empty String; otherwise, let _next_ be ? ToString(_element_).
-            1. Set _R_ to the string-concatenation of _R_ and _next_.
+            1. If _element_ is neither *undefined* nor *null*, then
+              1. Let _S_ be ? ToString(_element_).
+              1. Set _R_ to the string-concatenation of _R_ and _S_.
             1. Set _k_ to _k_ + 1.
           1. Return _R_.
         </emu-alg>
@@ -39801,11 +39802,10 @@ <h1>Array.prototype.toLocaleString ( [ _reserved1_ [ , _reserved2_ ] ] )</h1>
           1. Let _R_ be the empty String.
           1. Let _k_ be 0.
           1. Repeat, while _k_ &lt; _len_,
-            1. If _k_ > 0, then
-              1. Set _R_ to the string-concatenation of _R_ and _separator_.
-            1. Let _nextElement_ be ? Get(_array_, ! ToString(𝔽(_k_))).
-            1. If _nextElement_ is neither *undefined* nor *null*, then
-              1. Let _S_ be ? ToString(? Invoke(_nextElement_, *"toLocaleString"*)).
+            1. If _k_ > 0, set _R_ to the string-concatenation of _R_ and _separator_.
+            1. Let _element_ be ? Get(_array_, ! ToString(𝔽(_k_))).
+            1. If _element_ is neither *undefined* nor *null*, then
+              1. Let _S_ be ? ToString(? Invoke(_element_, *"toLocaleString"*)).
               1. Set _R_ to the string-concatenation of _R_ and _S_.
             1. Set _k_ to _k_ + 1.
           1. Return _R_.
@@ -40795,8 +40795,9 @@ <h1>%TypedArray%.prototype.join ( _separator_ )</h1>
           1. Repeat, while _k_ &lt; _len_,
             1. If _k_ > 0, set _R_ to the string-concatenation of _R_ and _sep_.
             1. Let _element_ be ! Get(_O_, ! ToString(𝔽(_k_))).
-            1. If _element_ is *undefined*, let _next_ be the empty String; otherwise, let _next_ be ! ToString(_element_).
-            1. Set _R_ to the string-concatenation of _R_ and _next_.
+            1. If _element_ is not *undefined*, then
+              1. Let _S_ be ! ToString(_element_).
+              1. Set _R_ to the string-concatenation of _R_ and _S_.
             1. Set _k_ to _k_ + 1.
           1. Return _R_.
         </emu-alg>