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test before assign or assign by default
(version: 0)
Comparing performance of:
test before assignement vs full assignement
Created:
3 years ago
by:
Guest
Jump to the latest result
Tests:
test before assignement
let list = [{value: '0', change: 'yes'}, {value: '0', change: 'no'}, {value: '0', change: 'yes'}, {value: '0', change: 'no'}, {value: '0', change: 'yes'}, {value: '1', change: 'no'}]; list.forEach((selectItem) => { if ('yes' === selectItem.change) { selectItem.value = '1'; } else { if (selectItem.value !== '0') selectItem.value = '0'; } });
full assignement
let list = [{value: '0', change: 'yes'}, {value: '0', change: 'no'}, {value: '0', change: 'yes'}, {value: '0', change: 'no'}, {value: '0', change: 'yes'}, {value: '1', change: 'no'}]; list.forEach((selectItem) => { if ('yes' === selectItem.value) { selectItem.value = '1'; } else { selectItem.value = '0'; } });
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
test before assignement
full assignement
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'd be happy to explain the provided benchmark and its different approaches. **Benchmark Overview** The benchmark, named "test before assign or assign by default," is designed to measure the performance difference between two approaches: assigning values before using them in an `if` statement (`"test before assignement"`) and not assigning values until they are used (`"full assignement"`). The test case contains an array of objects with a `value` property that needs to be updated based on its `change` property. **Options Compared** There are two options being compared: 1. **Assigning values before using them**: In this approach, the value is assigned immediately after it's accessed in the `if` statement. This means that the variable is declared and initialized with a value before it's used. 2. **Not assigning values until they are used**: In this approach, the value is only assigned when the condition is met, which means that the variable is not initialized until it's actually needed. **Pros and Cons of Each Approach** **Assigning Values Before Using Them:** Pros: * Can be faster because the value is declared and initialized immediately * May have better cache locality since the variable is accessed before it's used Cons: * Can lead to unnecessary memory allocation if the condition is not met * May result in slower performance due to premature memory allocation **Not Assigning Values Until They Are Used:** Pros: * Reduces unnecessary memory allocation, which can improve performance * Avoids potential issues with cache locality Cons: * Requires accessing and initializing the variable before it's used, which may be slower * May lead to increased memory pressure due to delayed initialization **Other Considerations** The benchmark also considers the impact of using `===` (strict equality) instead of `==` (loose equality). In this case, both approaches use `===`, so there is no significant difference in this regard. **Library Usage** There is no library usage mentioned in the provided benchmark definition or test cases. However, it's likely that a JavaScript engine or runtime environment like V8 (used by Chrome) or SpiderMonkey (used by Firefox) would be used to execute the benchmark. **Special JS Feature/Syntax** There are some special features and syntaxes used in this benchmark: * `let` is used for variable declaration. * `forEach` is used for iterating over an array. * String interpolation (`\r\n`) is used to create multi-line strings. * `===` (strict equality) is used for comparing values. **Alternatives** Some alternative approaches could be considered, such as: * Using a different data structure, like an object with dynamic properties, instead of an array of objects. * Adding more complex logic or operations within the `if` statement to increase the computational complexity. * Using multiple iterations or loops to increase the number of executions and improve statistical significance. However, these alternatives would likely require significant changes to the benchmark definition and test cases to produce meaningful results.
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