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spread vs flat
(version: 0)
Comparing performance of:
spread vs flat
Created:
5 years ago
by:
Guest
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Tests:
spread
const params1 = [ "hello", true, 7 ]; const params2 = [ "bar", false, 3 ]; const other = [ ...params1, ...params2 ];
flat
const params1 = [ "hello", true, 7 ]; const params2 = [ "bar", false, 3 ]; const other = [ params1, params2 ].flat();
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Suite status:
<idle, ready to run>
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Test case name
Result
spread
flat
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 world of JavaScript microbenchmarks and explore what's being tested on MeasureThat.net. **Benchmark Purpose:** The benchmark measures the performance difference between using the `...` spread operator (also known as the rest parameter syntax) versus the `.flat()` method to flatten an array of arrays. The goal is to determine which approach is faster for a specific use case, where we have multiple arrays being passed together. **Options Compared:** 1. **Spread Operator (`...`)**: - This operator allows you to pass multiple arguments as individual elements of the resulting array. - It's a shorthand way to create a new array by taking elements from other arrays or values. Pros: * More concise and readable code * Can be used for simple cases Cons: * May lead to confusion in more complex scenarios or when readability is less of an issue, due to its syntactic similarity with function arguments. - Performance can vary depending on the interpreter's optimizations and the specific use case. 2. **`.flat()` Method**: - This method returns a new array containing all elements from the input arrays. - It's more explicit about its intent than the spread operator. Pros: * More readable code for complex scenarios * Guarantees that only arrays are flattened, preventing potential issues with non-array values Cons: * Less concise syntax compared to the spread operator - May incur a performance overhead due to the extra method call and array creation. **Other Considerations:** - The choice of approach can affect code readability and maintainability. - Performance differences may vary depending on JavaScript engine optimizations, interpreter versions, and browser configurations. - The spread operator is a more recent addition to JavaScript (introduced in ECMAScript 2015), which might mean older browsers don't support it. **Library/Function Usage:** Neither of the methods provided uses any external libraries or functions beyond native JavaScript. Both are built-in for array manipulation and do not require any additional imports. **Special JS Feature/Syntax:** The spread operator (`...`) utilizes a special syntax introduced in ECMAScript 2015, specifically known as rest parameter syntax. This feature allows function arguments to be collected and passed as an array. While not unique to the context of this benchmark, its inclusion highlights modern JavaScript's flexibility. **Alternatives:** For similar array flattening tasks, you might also consider using: - **`Array.prototype.concat()`**: A method that returns a new array containing all elements from two or more arrays. - **`Array.prototype.reduce()`**: A method that applies a reducer function to each element in an array (potentially useful for more complex transformations). - **Loops**: Manual looping through arrays can be another approach, though it's less concise and generally less efficient. In conclusion, this benchmark compares two methods for flattening arrays of arrays: the spread operator (`...`) versus the `.flat()` method. The choice between these approaches depends on readability requirements and performance needs in specific use cases.
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