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javascript concat vs spread operator vs push123123100
(version: 0)
javascript concat vs spread operator vs push
Comparing performance of:
concat vs spread operator vs push vs spread operator2
Created:
3 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var existed =new Array(10000).map(x => 1);
Tests:
concat
var params = [ "hello", true, 7 ]; var other = existed.concat(params);
spread operator
var params = [ "hello", true, 7 ]; var other = [ ...existed, ...params ];
push
var params = [ "hello", true, 7 ]; var other = existed.push(...params);
spread operator2
var params = [ "hello", true, 7 ]; var clone = [ ...existed ]; var other = clone.push(...params);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
concat
spread operator
push
spread operator2
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Measuring JavaScript performance is crucial in ensuring that our code runs efficiently and effectively. Let's break down the provided JSON benchmark definition. **Benchmark Definition** The benchmark is designed to compare three approaches: 1. `concat()`: Using the `concat()` method to concatenate an array with another array. 2. Spread Operator (`...`): Using the spread operator to create a new array by copying elements from another array. 3. `push()`: Using the `push()` method to add one or more elements to the end of an array. These approaches are compared in terms of their performance, execution time, and memory usage. **Pros and Cons** Here's a brief analysis of each approach: * **Concatenation using `concat()`**: This is a widely supported and well-documented method for concatenating arrays. However, it can lead to temporary array creation and garbage collection overhead. * **Spread Operator (`...`)**: The spread operator is a relatively new feature introduced in ECMAScript 2015 (ES6). It provides a concise way to create a new array by copying elements from another array without the need for explicit `concat()` or other methods. However, it might not be supported in older browsers. * **`push()`**: This method is generally faster than concatenation because it modifies the original array directly without creating temporary copies. **Library Used** None of the benchmarked approaches rely on external libraries, making the results more representative of standard JavaScript behavior. **Special JS Features or Syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and is widely supported in modern browsers. This means that test users with older browsers might not see this feature. Now let's analyze the provided test cases: * **`concat()`**: The `concat()` method creates a new array by copying elements from another array. * In the first test case, it concatenates an existing array (`existed`) with another array (`params`). This results in creating a temporary copy of the original `existed` array before assigning the result to `other`. * **Spread Operator (`...`)**: The spread operator creates a new array by copying elements from another array without explicit method calls. * In the second test case, it spreads existing array elements onto `existed`, creating a new copy of `existed`. In the fourth test case, it also uses the spread operator on an existing array (`clone`), spreading its contents to `other`. * **`push()`**: The `push()` method adds one or more elements to the end of an array. * In the third test case, it pushes elements from `params` onto the end of `existed`, modifying the original array directly without creating a temporary copy. **Other Alternatives** Other alternatives for array concatenation include using the `Array.prototype.push()` method with multiple arguments or utilizing libraries like Lodash. However, these approaches might have varying performance characteristics and memory usage compared to the benchmarked methods. The benchmark provides valuable insights into the relative performance of different array manipulation techniques in JavaScript. It helps developers optimize their code for efficient execution times and resource utilization.
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