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If vs or equality check and re-assignment
(version: 0)
Comparing performance of:
if re-assignment vs Or re-assignment
Created:
2 years ago
by:
Registered User
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Script Preparation code:
var jsonObject = {}; for (let i = 0; i < 500; i++) { const key = `key_${i}`; const value = Math.random() + 1; // You can replace this with any desired value. jsonObject[key] = value; }
Tests:
if re-assignment
if (!jsonObject['key-250']) { jsonObject['key-250'] = 0 }
Or re-assignment
jsonObject['key-250'] = jsonObject['key-250'] || 0
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
if re-assignment
Or re-assignment
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the provided JSON benchmark data. **Benchmark Definition** The benchmark is designed to measure the performance difference between two approaches: 1. **If Statement with Re-Assignment**: This approach uses an if statement to check if a key exists in the `jsonObject`. If it doesn't exist, it reassigns the value of that key. 2. **Or Operator with Re-Assignment**: This approach uses the OR operator (`||`) to achieve the same result as the if statement. It also reassigns the value of the key if it doesn't exist. **Options Compared** The benchmark is comparing two options: * **If Statement with Re-Assignment**: `if (!jsonObject['key-250']) { jsonObject['key-250'] = 0; }` * **Or Operator with Re-assignment**: `jsonObject['key-250'] = jsonObject['key-250'] || 0` **Pros and Cons** 1. **If Statement with Re-Assignment**: * Pros: More readable and maintainable code, easier to understand the logic. * Cons: Can lead to slower performance due to the re-assignment of the key value. 2. **Or Operator with Re-assignment**: * Pros: Faster performance, as it avoids the re-assignment of the key value. However, it may require more lines of code and is less readable. * Cons: Less maintainable and understandable code. **Library and Special JS Feature** There is no library or special JavaScript feature used in this benchmark. The script only uses standard JavaScript syntax. **Considerations** When writing performance-critical code, consider the following: * Use const declarations whenever possible to avoid reassignments. * Avoid using OR operators with re-assignments if possible. * Use conditional statements (if/else) for more readable and maintainable code. **Other Alternatives** If you're looking for alternative approaches, here are a few options: 1. **Use `in` operator**: Instead of checking if a key exists using `jsonObject['key-250']`, use the `in` operator (`'key-250' in jsonObject`). This is faster and more readable. 2. **Use `??` operator**: Introduce the nullish coalescing operator (`??`) to simplify the re-assignment logic. ```javascript jsonObject['key-250'] = jsonObject['key-250'] ?? 0; ``` This approach eliminates the need for an if statement and is more readable than using the OR operator.
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