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js spread order
(version: 0)
Comparing performance of:
spread second vs spread first
Created:
4 years ago
by:
Guest
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Tests:
spread second
const x = { val: 1 } const y = { foo: 'foo', bar: 'bar' } const final = {x, ...y}
spread first
const x = { val: 1 } const y = { foo: 'foo', bar: 'bar' } const final = {...y, x}
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
spread second
spread first
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 JavaScript microbenchmark you provided on MeasureThat.net. **Benchmark Definition** The benchmark definition is not explicitly stated, but based on the test cases, it appears that we're testing the order of object spread in JavaScript. The benchmark defines two test cases: 1. `const final = {x, ...y}` (test case: "spread second") 2. `const final = {...y, x}` (test case: "spread first") **Options Compared** The two options being compared are: 1. **Object spread using the syntax `...`**: This is a shorthand way to create a new object by copying the keys and values from another object. 2. **Object spread using the syntax `{...object, property}`**: This is an older way of achieving the same result. **Pros and Cons** Here are some pros and cons of each approach: **Option 1: Object spread using `...`** Pros: * More concise and readable * Widely supported in modern browsers Cons: * Less familiar to developers who haven't used this syntax before * May not work as expected in older browsers or environments with limited support for the `...` operator **Option 2: Object spread using `{...object, property}`** Pros: * More explicit and clear about what's happening * Works in older browsers and environments that don't support the `...` operator Cons: * Less concise and more verbose than the `...` syntax * May be less readable for developers who are familiar with the `...` syntax **Library/Functions Used** In this benchmark, no specific library or function is used. The tests are purely about testing the behavior of JavaScript's object spread syntax. **Special JS Features/Syntax** The tests use a feature that was introduced in ECMAScript 2018: the spread operator (`...`). This feature allows you to create a new object by copying the keys and values from another object using this shorthand syntax. If your browser doesn't support this feature, you won't see the expected results. **Other Alternatives** If you're interested in testing other aspects of JavaScript performance or behavior, here are some alternatives: * MeasureThat.net also has benchmarks for other JavaScript topics, such as: + Array methods (e.g., `map`, `filter`, `reduce`) + String methods (e.g., `split`, `join`, `indexOf`) + Function calls and invocations * You can create your own benchmark using MeasureThat.net's API or explore other open-source benchmarking tools, such as: + JSPerf + Benchmark.js Keep in mind that the choice of benchmarking tool or approach depends on your specific use case and requirements.
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