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Assignment of value vs Destructuring an object in loop
(version: 0)
Comparing performance of:
Assign vs Destructure
Created:
4 years ago
by:
Registered User
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Script Preparation code:
var initData = [{"name":"Bevis"},{"name":"Kelly"},{"name":"Magee"},{"name":"Quinlan"},{"name":"Leonard"},{"name":"Quyn"},{"name":"Danielle"},{"name":"Keaton"},{"name":"Jeremy"},{"name":"Knox"}] var names = initData.concat(...(new Array(10).fill(initData))) var data = names.map(() => ({names}))
Tests:
Assign
data.forEach((item) => item.names.forEach((item) => console.log(item.name)))
Destructure
data.forEach(({names}) => names.forEach(({name}) => console.log(name)))
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Assign
Destructure
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Benchmark Explanation** The provided benchmark measures the performance difference between two approaches: assigning values to an object and destructuring an object in a loop. **Options Compared** Two test cases are compared: 1. **Assign**: In this approach, a reference to the `names` property of each object is assigned to a variable, allowing for multiple assignments. 2. **Destructure**: In this approach, the `names` property is destructured from each object, which creates new references. **Pros and Cons** * **Assign**: + Pros: Can be faster due to caching of the reference. + Cons: May lead to unexpected behavior if the variable is reassigned or becomes null. * **Destructure**: + Pros: Avoids potential issues with assigning a new value to a variable that is already being referenced elsewhere in the code. + Cons: Can be slower due to the creation of new references. In general, the choice between these approaches depends on the specific use case and the desired behavior. If you need to assign multiple values to an object reference, `Assign` might be a better choice. However, if you need to create new references for each iteration, `Destructure` is likely a better option. **Library** None **Special JS Features or Syntax** The benchmark does not use any special JavaScript features or syntax beyond the standard ECMAScript syntax. **Other Considerations** * **Cache locality**: The `Assign` approach can take advantage of cache locality, as the reference to `names` is assigned only once. * **Garbage collection**: The `Destructure` approach may lead to more garbage collection due to the creation of new references. **Alternatives** If you want to explore alternative approaches or optimizations, you could consider: 1. Using a caching library to reduce the number of property lookups. 2. Implementing a custom loop optimization that avoids creating new references. 3. Using a Just-In-Time (JIT) compiler to optimize the code for specific use cases. However, it's essential to note that these optimizations may not be relevant or effective in this particular benchmark, and the current test cases provide a good starting point for measuring performance differences between `Assign` and `Destructure`.
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