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compare string replace all RegExp and split + join and replace
(version: 2)
Comparing performance of:
Regular Expression Literal: vs split and join vs Regular Expression: vs while replace includes vs while replace indexOf
Created:
5 years ago
by:
Registered User
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Script Preparation code:
var str = "Test abc test test abc test test test abc test test abc"
Tests:
Regular Expression Literal:
str = str.replace(/abc/g, "replaced text");
split and join
str = str.split("abc").join("replaced text");
Regular Expression:
str = str.replace(new RegExp("abc", "g"), "replaced text");
while replace includes
while(str.includes("abc")){ str = str.replace("abc", "replaced text"); }
while replace indexOf
while(str.indexOf("abc") !== -1){ str = str.replace("abc", "replaced text"); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (5)
Previous results
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Test case name
Result
Regular Expression Literal:
split and join
Regular Expression:
while replace includes
while replace indexOf
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Overview** The provided JSON represents a JavaScript microbenchmark that compares the performance of different approaches to replace all occurrences of a substring in a string: using regular expressions with literals, using split and join, and using while loops with includes or indexOf methods. **Comparison Approaches** There are four test cases: 1. **Regular Expression Literal**: Uses `str.replace(/abc/g, "replaced text");` * This approach uses a literal regular expression to match the substring "abc" globally. * Pros: Simple and concise syntax, suitable for simple patterns. * Cons: May not be efficient for large strings or complex patterns. 2. **split and join**: Uses `str.split("abc").join("replaced text");` * This approach splits the string into an array of substrings using "abc" as a delimiter, then joins them back together with "replaced text". * Pros: Can be efficient for large strings or complex patterns, but may have overhead due to creating and manipulating arrays. * Cons: May not be suitable for simple cases where only one replacement is needed. 3. **while replace includes**: Uses `while (str.includes("abc")) { str = str.replace("abc", "replaced text"); }` * This approach uses a while loop to repeatedly check if the string includes "abc" and replace it until no more matches are found. * Pros: Simple and efficient, suitable for simple cases where only one replacement is needed. * Cons: May not be suitable for large strings or complex patterns, as it can lead to an infinite loop if the string contains "abc" repeatedly without a clear termination condition. 4. **while replace indexOf**: Uses `while (str.indexOf("abc") !== -1) { str = str.replace("abc", "replaced text"); }` * This approach uses a while loop to repeatedly check if the string includes "abc" using the indexOf method, and replace it until no more matches are found. * Pros: Similar to the previous approach, but uses the indexOf method instead of includes. May be more suitable for large strings or complex patterns. * Cons: May have similar issues with infinite loops as the includes-based approach. **Library Usage** None of the test cases use any external libraries. However, the `RegExp` object is used in the "Regular Expression Literal" and "Regular Expression:" approaches, which is a built-in JavaScript object. **Special JS Feature or Syntax** The benchmark uses JavaScript's regular expression matching syntax to match the substring "abc". There is no special JavaScript feature or syntax explicitly mentioned, but the use of `g` flag in some test cases suggests using the global matching mode, which can improve performance for certain types of patterns.
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