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reduce
(version: 0)
Comparing performance of:
spread vs concat vs push
Created:
6 years ago
by:
Guest
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Script Preparation code:
var list = []; var LIMIT = 2000;
Tests:
spread
for(var i = 0; i < LIMIT; i++) list = [...list, {a:2}];
concat
for(var i = 0; i < LIMIT; i++) list == list.concat([{a:2}]);
push
for(var i = 0; i < LIMIT; i++) list.push({a:2});
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
spread
concat
push
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 dive into the world of JavaScript microbenchmarks! **Benchmark Overview** The benchmark is designed to test the performance of three different approaches for appending elements to an array in JavaScript: using the spread operator (`...`), concatenation (`+`, `concat()` methods), and the `push()` method. **Script Preparation Code** The script preparation code initializes an empty array `list` and sets a constant value `LIMIT` to 2000. This is done for each benchmark definition provided in the individual test cases. **Individual Test Cases** Each test case consists of two parts: 1. **Benchmark Definition**: A JavaScript expression that defines the operation to be performed on the array `list`. The expressions are designed to perform the same operation: appending a fixed number of elements (`{a:2}`) to the array, with the only difference being the approach used. * "spread": uses the spread operator (`...`) to append elements to the array * "concat": uses concatenation to append elements to the array (using the `+` operator and `concat()` methods) * "push": uses the `push()` method to append elements to the array 2. **Test Name**: A string indicating which approach is being tested **Pros and Cons of Each Approach** Here's a brief summary of the pros and cons of each approach: * **Spread Operator (`...`)**: + Pros: concise, efficient, modern syntax + Cons: supported by most browsers, but older versions may not have optimized performance * **Concatenation (`+`, `concat()` methods)**: + Pros: widely supported across all browsers, well-established syntax + Cons: slower than the spread operator due to the overhead of creating intermediate arrays * **Push() Method**: + Pros: simple, fast, and widely supported + Cons: may not be as concise or modern as the spread operator **Library and Purpose** None of these approaches rely on any external libraries. They are built-in JavaScript features. **Special JS Feature/ Syntax** The use of the spread operator (`...`) is a relatively modern feature introduced in ECMAScript 2015 (ES6). It's widely supported across modern browsers, but may not be compatible with older versions. The `concat()` method is also an older feature that has been part of JavaScript for a long time. **Alternatives** If you want to explore alternative approaches or variations on these methods, consider: * Using other array manipulation methods, such as `splice()`, `unshift()`, or `insertAt()`. * Exploring more modern alternatives like `Array.prototype.at()` or `Array.prototype.some()` for iterating over arrays. * Investigating the use of specialized libraries or frameworks that optimize array performance, such as Lodash or Ramda. Keep in mind that these alternatives may change the nature of your benchmarking efforts or require adjustments to your code.
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