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Adding value to array efficiency
(version: 0)
Comparing performance of:
Array.prototype.concat vs spread operator vs Push
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.concat
var arr = ["t", "te", "tes","test", "TES", "TE", "T"]; var arr2 = arr.concat("newValue");
spread operator
var arr = ["t", "te", "tes","test", "TES", "TE", "T"]; var arr2 = [...arr, "newValue"]
Push
var arr = ["t", "te", "tes","test", "TES", "TE", "T"]; var arr2 = arr.push("newValue");
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
Array.prototype.concat
spread operator
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 JSON data and explain what's being tested. **Benchmark Definition** The benchmark definition is an object that contains metadata about the test case, such as its name and description (which is empty in this case). It also includes script preparation code and HTML preparation code (both are null in this example). However, there is no actual script code provided. Instead, the script definition is embedded directly within the benchmark definition JSON object. The script defines an array `arr` with some strings and then attempts to add a new value to it using one of three different approaches: 1. `Array.prototype.concat()`: This method concatenates the original array `arr` with a new string `"newValue"`. 2. Spread operator (`...`): This syntax creates a new array by spreading the elements of the original array `arr` and appending the new value `"newValue"`. 3. `Push()` method: This method adds one or more elements to the end of an array, in this case, appending the new value `"newValue"`. **Options Compared** The three approaches (concatenation, spread operator, and push) are being compared to measure their efficiency. **Pros and Cons of Each Approach** 1. `Array.prototype.concat()`: * Pros: Easy to read and understand, works well with older browsers. * Cons: Creates a new array object, can be slower than other approaches for large arrays. 2. Spread operator (`...`): * Pros: Efficient and modern syntax, creates a new array without modifying the original one. * Cons: May not work in older browsers or require explicit polyfills. 3. `Push()` method: * Pros: Simple and efficient way to append elements to an array. * Cons: Can be slower than other approaches for large arrays due to the overhead of the push operation. **Library/Functionality Used** None, as these are native JavaScript functions. **Special JS Feature/Syntax** The spread operator (`...`) is a relatively new feature introduced in ECMAScript 2015 (ES6). It's not supported in older browsers without polyfills. The `Push()` method is also not explicitly called in the code; it's a shorthand for `arr.push("newValue")`. **Other Alternatives** If you wanted to test alternative approaches, you could consider using other methods like: * Using `Array.prototype.slice()` and concatenating * Using a custom implementation of an array append method * Comparing performance with other languages or frameworks Keep in mind that the best approach will depend on your specific use case, requirements, and target audience.
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