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array concat vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
7 years ago
by:
Registered User
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
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Suite status:
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Result
Array.prototype.concat
spread operator
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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 Description** The benchmark is comparing two approaches for concatenating arrays in JavaScript: 1. The traditional `concat()` method 2. The new ES6 spread operator (`...`) In other words, we're testing which approach is faster and more efficient when concatenating two arrays: `[1, 2]` and either an array of strings, a boolean, or an integer. **Options Compared** We have two options being compared: A) `Array.prototype.concat()` B) Using the spread operator (`...`) to concatenate arrays **Pros and Cons of Each Approach** A) `Array.prototype.concat()` Pros: * Widely supported in older browsers * Easy to understand and use for developers familiar with traditional array methods Cons: * May be slower due to its overhead, as it creates a new array object * Less efficient than the spread operator when dealing with large arrays or multiple concatenations B) Using the spread operator (`...`) Pros: * Fast and efficient, especially when dealing with large arrays or multiple concatenations * More modern and concise syntax, making code easier to read and write Cons: * Not supported in older browsers that don't implement ES6+ features * May require a slight adjustment for developers who aren't familiar with the spread operator **Library and Purpose** None of the test cases use any external libraries. The focus is solely on comparing the two array concatenation approaches. **Special JavaScript Features or Syntax** The test case using the spread operator introduces a new syntax feature in ES6+: the rest parameter (`...`). This allows for concise array unpacking, where `1, 2` can be replaced with `...[1, 2]`. However, this is not unique to MeasureThat.net and has been widely adopted in modern JavaScript development. **Other Alternatives** There are alternative approaches to concatenating arrays, such as using the `Array.prototype.push()` method or utilizing `String.join()` for string concatenation. However, these methods are less relevant to the benchmark's focus on array concatenation performance. In summary, MeasureThat.net is testing two approaches for concatenating arrays in JavaScript: the traditional `concat()` method and the new ES6 spread operator. The test case using the spread operator highlights its efficiency and modern syntax, while also considering potential drawbacks like non-support in older browsers.
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