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Immutability of JavaScript Strings: Do We Need a "String Builder"?
In JavaScript, strings are immutable, meaning you cannot modify their contents once they are created. The myth that string concatenation is slow also persists, making developers assume the need for a string builder. However, benchmarks prove otherwise.
Benchmarks: Performance of String Manipulation Methods
To debunk the myth, we conducted tests comparing different string concatenation methods, including both using array indexing to avoid array pushing and straight string concatenation. The results showed no significant speed differences between the two methods.
Case 1: Concatenating the Same String Repeatedly
Results: Both methods showed comparable performance.
Case 2: Concatenating Random Strings
Results: Again, both methods showed similar performance.
Conclusion:
Contrary to popular belief, string concatenation in JavaScript is not slow. Therefore, there is no need for a dedicated string builder in the language.
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