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LibJS+AK: Make String.prototype.repeat() way faster
Instead of using a StringBuilder, add a String::repeated(String, N) overload that takes advantage of knowing it's already all UTF-8. This makes the following microbenchmark go 4x faster: "foo".repeat(100_000_000) And for single character strings, we can even go 10x faster: "x".repeat(100_000_000)
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3 changed files with 21 additions and 4 deletions
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@ -777,10 +777,7 @@ JS_DEFINE_NATIVE_FUNCTION(StringPrototype::repeat)
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return PrimitiveString::create(vm, String {});
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// 6. Return the String value that is made from n copies of S appended together.
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StringBuilder builder;
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for (size_t i = 0; i < n; ++i)
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builder.append(string);
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return PrimitiveString::create(vm, MUST(builder.to_string()));
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return PrimitiveString::create(vm, String::repeated(string, n));
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}
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// 22.1.3.19 String.prototype.replace ( searchValue, replaceValue ), https://tc39.es/ecma262/#sec-string.prototype.replace
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