Benchmark: pick by substring key fixed

Tests:

substring & array result
const object = {'key1': 'value1', 'key2': 'value2', 'key1 variant': 'value1 variant'} const result = [] const key='key1 variant' for (let i = 0; i <= key?.length; i++) { if (key[i] === ' ' || i === key.length) { const current = key.substring(0, i) if (object[current]) { result.push(object[current]) } } } const final = result.join(' ')
string builder & array result
const object = {'key1': 'value1', 'key2': 'value2', 'key1 variant': 'value1 variant'} const result = [] const key='key1 variant' let current = '' for (let i = 0; i <= key?.length; i++) { current += key[i] if (key[i] === ' ' || i === key.length) { if (object[current]) { result.push(object[current]) } } } const final = result.join(' ')
substring & string result
const object = {'key1': 'value1', 'key2': 'value2', 'key1 variant': 'value1 variant'} let result = '' const key='key1 variant' for (let i = 0; i <= key?.length; i++) { if (key[i] === ' ' || i === key.length) { const current = key.substring(0, i) if (object[current]) { result += ' ' + object[current] } } }
string builder & string result
const object = {'key1': 'value1', 'key2': 'value2', 'key1 variant': 'value1 variant'} let result = '' const key='key1 variant' let current = '' for (let i = 0; i <= key?.length; i++) { current += key[i] if (key[i] === ' ' || i === key.length) { if (object[current]) { result += ' ' + object[current] } } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring & array result
string builder & array result
substring & string result
string builder & string result

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Windows

View result in a separate tab

Test name	Executions per second
substring & array result	2954918.5 Ops/sec
string builder & array result	2076609.6 Ops/sec
substring & string result	4155907.0 Ops/sec
string builder & string result	2064311.4 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

The provided JSON represents a JavaScript microbenchmark test case on MeasureThat.net. The benchmark is designed to measure the performance of different approaches for iterating over a key in an object, with varying results.

**Benchmark Definition Explanation**

The benchmark definition consists of four test cases:

1. **"substring & array result"`**: This test case uses the `for` loop to iterate over each character in the key using the `key[i]` syntax. The resulting array is then joined into a string.
2. **"string builder & array result"`**: Similar to the first test case, but instead of using the `key[i]` syntax, it uses the `current += key[i]` approach, which builds a string incrementally.
3. **"substring & string result"`**: This test case iterates over each character in the key and appends the corresponding value from the object to a string (`result += ' ' + object[current]`).
4. **"string builder & string result"`**: Similar to the third test case, but uses the `current += key[i]` approach to build the resulting string.

**Comparison of Approaches**

Here's a brief analysis of each approach:

*   **`for (let i = 0; i <= key?.length; i++) { ... }`**: This approach iterates over each character in the key, but it can lead to an out-of-bounds error if the key is empty or contains null characters. However, it's simple and easy to understand.
*   **`current += key[i]`**: This approach builds a string incrementally by appending each character of the key. It avoids potential out-of-bounds errors but requires more memory allocation for the intermediate strings.
*   **String concatenation (`result += ' ' + object[current]`)**: This approach creates a new string by concatenating the result with the value from the object. It's simple and easy to read, but can lead to performance issues if done repeatedly.

**Pros and Cons of Each Approach**

| Approach | Pros | Cons |
| --- | --- | --- |
| `for (let i = 0; i <= key?.length; i++) { ... }` | Simple and easy to understand | Potential out-of-bounds errors |
| `current += key[i]` | Avoids out-of-bounds errors, requires less memory allocation | More complex, intermediate strings may be created |
| String concatenation (`result += ' ' + object[current]`) | Simple and easy to read | Performance issues if repeated, creates new strings |

**Other Considerations**

When implementing these approaches, it's essential to consider the following:

*   **Memory safety**: Avoid out-of-bounds errors by checking the length of the key before iterating.
*   **Performance**: Use efficient data structures and algorithms to minimize memory allocation and copying.
*   **Code readability**: Choose an approach that is easy to understand and maintain, as it will make your code more maintainable.

**Alternative Approaches**

Other approaches to iterate over a key in an object include:

*   Using `Object.keys()` or `for...in` loops with the `hasOwnProperty()` method
*   Utilizing modern JavaScript features like `Map` or `Set`
*   Employing array methods like `forEach()`, `map()`, or `reduce()`

However, these alternatives might not be directly comparable to the provided benchmark, as they offer different use cases and performance profiles.

The final answer is there is no specific numerical answer for this question.

Related benchmarks:

pick by substring key fixed (version: 0)

Comparing performance of: substring & array result vs string builder & array result vs substring & string result vs string builder & string result

Created: 2 years ago by: Guest

Jump to the latest result

substring & array result

string builder & array result

substring & string result

string builder & string result

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):