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js push vs concat
(version: 0)
push vs concat
Comparing performance of:
concat vs spread
Created:
5 years ago
by:
Guest
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Tests:
concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
concat
spread
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark information to explain what's being tested, compared, and their pros/cons. **Benchmark Definition** The benchmark is designed to compare two approaches for adding an array of elements to another array: using `concat()` or the spread operator (`...`). **Script Preparation Code** and **Html Preparation Code** These fields are empty, which means that no additional setup code needs to be executed before running the benchmark. This allows the focus to be solely on the performance comparison between the two approaches. **Individual Test Cases** There are two test cases: 1. `concat`: This test case uses the traditional `concat()` method to add elements from an array (`params`) to another array (`other`). The syntax is: ```javascript var other = [ 1, 2 ].concat(params); ``` 2. `spread`: This test case uses the spread operator (`...`) to add elements from an array (`params`) to another array (`other`). The syntax is: ```javascript var other = [ 1, 2, ...params ]; ``` **Pros and Cons** Both approaches have their advantages and disadvantages: * **Concat()** + Pros: Well-established method, widely supported by browsers. + Cons: Creates a new array, which can lead to memory allocation overhead. * **Spread Operator (`...`)** (introduced in ECMAScript 2015) + Pros: More efficient than `concat()` since it only copies the elements and doesn't create a new array. It's also more concise and easier to read. + Cons: May not be supported by older browsers, and some developers might find it less familiar or less readable. **Library Usage** There is no library usage in these test cases. The benchmark focuses solely on comparing the performance of two built-in JavaScript methods. **Special JS Feature/Syntax** The spread operator (`...`) is a new feature introduced in ECMAScript 2015. It's designed to simplify the process of adding elements to an array by using the `...` syntax instead of the dot notation (`[...]`). This feature has become widely adopted in modern JavaScript development. **Other Alternatives** Before the spread operator was introduced, developers used other methods to achieve the same result, such as: * Using the `push()` method with multiple arguments: `arr.push(...params)`. * Creating a new array using the `Array.prototype.slice()` method and spreading it into another array: `var other = [1, 2].slice().concat(params)`. However, these alternatives have similar performance characteristics to the spread operator, making it generally the most efficient choice.
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