[Webkit-unassigned] [Bug 188882] New: String.concat() significantly slower than '+' operator

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=188882

            Bug ID: 188882
           Summary: String.concat() significantly slower than '+' operator
           Product: WebKit
           Version: Safari 11
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: JavaScriptCore
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: nickshanks at nickshanks.com

When String.prototype.concat() and String.prototype.join() have not been modified from their initial values, promotion of their arguments to strings and concatenation of those strings should be nearly as fast as the '+' operator with one string operand (which also has to promote the other operand). This will allow functional composition to be performant.

See https://jsperf.com/concat-vs-plus-vs-join-2

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