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how-to-insert-a-string-at-a-specific-index-in-javascript 2
(version: 1)
Benchmark.js
Comparing performance of:
slcie vs splice
Created:
4 years ago
by:
Registered User
Go to the latest result
Tests:
slcie
let origString = "GeeksGeeks"; let stringToAdd = "For"; let indexPosition = 5; newString = origString.slice(0, indexPosition) + stringToAdd + origString.slice(indexPosition);
splice
let origString = "GeeksGeeks"; let stringToAdd = "For"; let indexPosition = 5; // Split the string into individual // characters origString = origString.split(''); // Insert the string at the index position origString.splice(indexPosition, 0, stringToAdd); // Join back the individual characters // to form a new string newString = origString.join('');
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
slcie
splice
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
2 years ago
)
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36
Browser/OS:
Chrome 121 on Mac OS X 10.15.7
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<iframe src="https://measurethat.net/Embed?id=508980" width="100%" height="500px"></iframe>
slcie
12.2M/s
splice
4.2M/s
View exact numbers
Test name
Executions per second
✓
slcie
12,172,210 Ops/sec
splice
4,175,572 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to help you understand what's being tested on the provided JSON and explain the different approaches used in the benchmark. **Benchmark Definition** The benchmark definition is a set of two test cases, each measuring the performance of inserting a string at a specific index in JavaScript. The first test case, "slcie," uses the `slice()` method to create a new string by taking a subset of the original string and concatenating it with another string. The second test case, "splice," uses the `splice()` method to insert the string into the original string. **Options Compared** The benchmark compares two different approaches: 1. **`slice()` method**: This approach creates a new string by taking a subset of the original string using `slice()`. It then concatenates the inserted string with the remaining part of the original string. 2. **`splice()` method**: This approach modifies the original string in-place and inserts the string at the specified index using `splice()`. The resulting string is not stored, so it's only valid for a single execution. **Pros and Cons** Here are some pros and cons of each approach: * **`slice()` method**: + Pros: Creates a new string with minimal overhead, can be more efficient for large strings. + Cons: Can lead to unnecessary memory allocations if the resulting string is not used immediately. * **`splice()` method**: + Pros: Modifies the original string in-place, reduces memory allocations. + Cons: Can lead to slower performance due to the overhead of modifying the string. **Library** Neither of the test cases uses any external libraries. However, it's worth noting that some JavaScript engines, like V8 (used by Google Chrome), have built-in optimizations for certain operations, such as string manipulation. **Special JS Features or Syntax** There are no special JavaScript features or syntax used in these benchmark definitions. They only use standard JavaScript language elements and methods. **Other Alternatives** If you were to implement this benchmark yourself, some alternative approaches could include: 1. **Using `concat()` instead of `slice()`**: This would concatenate the inserted string with the original string using the `concat()` method. 2. **Using a temporary array and `join()`**: Instead of creating a new string using `slice()`, you could create a temporary array with the characters of the original string and then join them together using the `join()` method. 3. **Using a loop to insert the string**: You could use a loop to iterate over the characters of the original string and insert the inserted string at each index, rather than using `splice()`. Keep in mind that these alternatives might change the performance characteristics of the benchmark, so it's essential to test them thoroughly to ensure they meet your requirements.
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