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Adding to an array
(version: 0)
Comparing performance of:
concat vs spread operator vs iterate and push
Created:
8 years ago
by:
Guest
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Tests:
concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
iterate and push
var params = [ "hello", true, 7 ] var other = [ 1, 2 ] for (var i = 0; i < params.length; i++) { other.push(params[i]); }
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Suite status:
<idle, ready to run>
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Test case name
Result
concat
spread operator
iterate and push
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmarking data and explain what's being tested. **Benchmark Definition** The `Name` field of the benchmark definition json is "Adding to an array". This indicates that the goal of this benchmark is to measure how efficiently JavaScript arrays can be extended or modified with new elements. **Options Compared** Three different approaches are compared in this benchmark: 1. **Concatenation using `concat()`**: This approach uses the built-in `concat()` method to append elements from one array to another. 2. **Spread Operator (`...`)**: This approach uses the spread operator to insert elements into an existing array by spreading its contents. 3. **Manual Iteration and Pushing**: This approach manually iterates over the elements of the first array and pushes each element onto a new array. **Pros and Cons** * **Concatenation using `concat()`**: + Pros: Simple, straightforward, widely supported. + Cons: Can be slow for large arrays due to the overhead of creating a new array and copying elements. * **Spread Operator (`...`)**: + Pros: Fast, efficient, and concise. Reduces verbosity compared to manual iteration. + Cons: Requires modern JavaScript versions (ECMAScript 2015+) and might not work in older browsers. * **Manual Iteration and Pushing**: + Pros: Control over the iteration process, potentially faster for very large arrays due to avoiding array creation overhead. + Cons: More verbose, prone to errors if not implemented carefully. **Library/Tool Usage** There is no library or tool explicitly used in this benchmark. However, it's worth noting that `concat()` and spread operator are built-in JavaScript features. **Special JS Feature/Syntax** No special JavaScript feature or syntax is used in these benchmarks. **Other Alternatives** Other alternatives to concatenation might include: * Using `Array.prototype.push()`, `Array.prototype.splice()`, or other array methods for modification. * Utilizing library functions like Lodash's `union()` or `concat()` functions. * Leveraging browser-specific optimizations, such as WebAssembly arrays. Keep in mind that the choice of approach often depends on performance requirements, readability, and compatibility considerations.
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