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ES6 spread operator vs Array.concat
(version: 0)
Compare the new ES6 spread operator with the concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
5 years ago
by:
Guest
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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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Test case name
Result
Array.prototype.concat
spread operator
Fastest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll explain the benchmark and its components. **Benchmark Overview** The given JSON represents a JavaScript microbenchmark on MeasureThat.net, which compares the performance of two approaches: the ES6 spread operator (`...`) and the `Array.prototype.concat()` method. The goal is to determine which approach is faster for creating a new array by concatenating an existing array with another array. **Script Preparation Code** There is no script preparation code provided in the JSON, which means that the benchmark creator did not include any additional setup or teardown code before running each test case. This could be either because it was not necessary or because the focus of the benchmark was solely on comparing the two approaches. **Individual Test Cases** The benchmark consists of two individual test cases: 1. **Array.prototype.concat**: This test case uses the `concat()` method to concatenate an existing array (`[ 1, 2 ]`) with another array (`params`). The `params` array is created by passing three values: `"hello"`, `true`, and `7`. The resulting concatenated array is stored in the `other` variable. 2. **Spread Operator**: This test case uses the ES6 spread operator (`...`) to create a new array by concatenating an existing array (`[ 1, 2 ]`) with another array (`params`). The `params` array is created by passing three values: `"hello"`, `true`, and `7`. The resulting concatenated array is stored in the `other` variable. **Pros and Cons of Each Approach** **Array.prototype.concat()** Pros: * Well-established and widely supported method * Can be used for concatenating arrays of arbitrary data types Cons: * Can create a new array object, which can lead to performance issues if the original arrays are very large * May not be as efficient as other methods for creating new arrays with small amounts of data **ES6 Spread Operator** Pros: * Creates a new array with minimal overhead * More concise and expressive than `concat()` * Can handle arrays of arbitrary data types Cons: * Not all browsers support the ES6 spread operator (although it is widely supported) * May not be as efficient for very large arrays due to the creation of a temporary array object **Other Considerations** When comparing these two approaches, it's essential to consider the context in which they are used. For small amounts of data, the ES6 spread operator may be faster and more efficient. However, for larger datasets or performance-critical applications, the `concat()` method might be a better choice due to its widespread support and established performance characteristics. **Library** There is no specific library mentioned in the benchmark JSON. The focus is on comparing two built-in JavaScript methods: `Array.prototype.concat()` and the ES6 spread operator. **Special JS Feature or Syntax** The ES6 spread operator (`...`) is a feature introduced in ECMAScript 2015, which allows creating new arrays by concatenating existing arrays using the syntax `[ ...array ]`. This feature was added to JavaScript in modern browsers and Node.js environments. That's a summary of the benchmark and its components!
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