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JS array spread operator vs push
(version: 0)
test insertion efficiency
Comparing performance of:
Push vs Spread operator
Created:
3 years ago
by:
Guest
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Tests:
Push
var params = [ 1, 2 ]; params.push(1);
Spread operator
var params = [ 1, 2 ] params = [ ...params, 1 ]
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Push
Spread operator
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 benchmark and explain what's being tested. **Benchmark Purpose** The benchmark aims to compare the insertion efficiency of two approaches: 1. **Push**: Using the `push` method to add an element to the end of an array. 2. **Spread Operator**: Using the spread operator (`...`) to create a new array with the original elements and the newly added element. **Options Compared** The benchmark compares these two options because they have different performance characteristics: * The `push` method involves updating the length property of the array, which can lead to slower performance. * The spread operator creates a new array object by copying the existing elements, which can be more efficient for larger arrays. **Pros and Cons of Each Approach** 1. **Push** * Pros: Simple, widely supported, and works well for small arrays. * Cons: Can lead to slower performance due to updating the length property, especially for large arrays. 2. **Spread Operator** * Pros: More efficient for larger arrays since it creates a new array object without updating the length property. * Cons: Requires modern JavaScript features (introduced in ECMAScript 2018) and may not work in older browsers. **Library/Tool Used** There is no specific library or tool mentioned in the benchmark definition. However, the benchmark uses the `...` spread operator, which is a built-in feature of JavaScript introduced in ECMAScript 2015 (ES6). **Special JS Feature/Syntax** The benchmark uses a modern JavaScript feature: the spread operator (`...`). This feature was introduced in ECMAScript 2015 (ES6) and allows creating new arrays by copying existing elements. While not all browsers support this feature, it's widely supported in modern browsers. **Alternative Approaches** Other alternatives for inserting an element into an array could include: * Using the `unshift` method instead of `push`. * Creating a new array using the `Array.from()` method and adding the element to it. * Using a library like Lodash, which provides a `compact` function that can be used to add elements to an array. However, these alternatives may not be as efficient or widely supported as the push method or the spread operator.
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