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Array.prototype.concat vs spread on two arrays
(version: 0)
Join arrays by concat or spread
Comparing performance of:
Concat vs Spread
Created:
3 years ago
by:
Guest
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Tests:
Concat
const params = ["hello", true, 7]; const other = [1, 2]; const joint = params.concat(other);
Spread
const params = ["hello", true, 7]; const other = [1, 2]; const joint = [...params, ...other];
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Concat
Spread
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and its components. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark that tests two approaches to joining arrays: using `Array.prototype.concat()` and using the spread operator (`...`). **What is being tested?** In this benchmark, we're comparing the performance of two ways to concatenate two arrays: 1. Using the `concat()` method on the first array (`params`) and passing the second array (`other`) as an argument. 2. Using the spread operator (`...`) to merge the two arrays. **Options compared** The two options being compared are: * `Array.prototype.concat()` * Spread operator (`...`) **Pros and Cons of each approach:** 1. **`Array.prototype.concat()`** * Pros: + Well-supported in older browsers (e.g., Internet Explorer). + Can be useful when working with arrays that need to be extended by a new array. * Cons: + Has a higher overhead due to the function call and potential array reallocation. 2. **Spread operator (`...`)** * Pros: + Faster and more efficient, as it avoids the overhead of function calls and array reallocations. + Widely supported in modern browsers and Node.js. * Cons: + Requires JavaScript 2015 or later for syntax support. **Library usage** There is no library explicitly mentioned in this benchmark. However, it's worth noting that some modern browsers may use polyfills to support older syntax or features, which could affect the results of this benchmark. **Special JS feature or syntax** The spread operator (`...`) is a relatively recent addition to JavaScript, introduced in ECMAScript 2015 (ES6). This makes it more likely that modern browsers will support it. In contrast, `Array.prototype.concat()` has been part of the language since ES5. **Other alternatives** If you want to explore other approaches or libraries for array concatenation, some alternatives include: * `Array.prototype.push()`: While not as efficient as spread operator or concat(), this method can be useful when working with arrays that need to be extended in place. * `String.join()`**: This method is specifically designed for joining strings, but it can also be used to concatenate arrays of values into a single string. * Libraries like Lodash or Ramda: These libraries provide utility functions for array manipulation, including concatenation. In summary, this benchmark tests the performance of two approaches to joining arrays in JavaScript: using `Array.prototype.concat()` and using the spread operator (`...`). The spread operator is generally faster but requires modern JavaScript syntax support.
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