Benchmark: javascript LARGE concat vs spread operator vs push

Tests:

concat
var existed = new Array(500000); var params = [ "hello", true, 7 ]; var other = existed.concat(params);
spread operator
var existed = new Array(500000); var params = [ "hello", true, 7 ]; var other = [ ...existed, ...params ];
push
var existed = new Array(500000); var params = [ "hello", true, 7 ]; var other = existed.push(...params);
push apply
var existed = new Array(500000); var params = [ "hello", true, 7 ]; var other = existed.push.apply(existed,params);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
concat
spread operator
push
push apply

Fastest: N/A

Slowest: N/A

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

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Measuring JavaScript performance is crucial for optimizing our code. Let's dive into the benchmark and understand what's being tested.

**Benchmark Overview**

The benchmark compares three approaches to concatenate an array of 500,000 elements with another array of 3 elements using different methods: `concat`, `spread operator`, and `push`. The goal is to determine which method is the fastest.

**Options Compared**

1. **`concat()`**: This method takes an existing array and appends new elements to it.
2. **Spread Operator (`...`)**: This method uses the spread operator to create a new array by copying elements from an existing array and adding new elements.
3. **`push()`**: This method adds one or more elements to the end of an existing array.
4. **`push.apply()`**: Similar to `push()`, but it takes an additional argument (the array) instead of just the elements.

**Pros and Cons**

1. **`concat()`**:
	* Pros: Simple, intuitive, and widely supported.
	* Cons: Can be slow for large arrays because it creates a new array and copies all elements.
2. **Spread Operator (`...`)**:
	* Pros: Efficient, modern, and flexible (can also use rest parameters).
	* Cons: Not supported in older browsers or environments that don't support ES6+ syntax.
3. **`push()`**:
	* Pros: Fast and efficient, especially when adding a single element.
	* Cons: May not be suitable for concatenating multiple elements at once.
4. **`push.apply()`**:
	* Pros: A variation of `push()` that avoids the overhead of creating an array.
	* Cons: Still uses `push()`, which can lead to unnecessary calls.

**Library and Special JS Feature**

None of these methods rely on external libraries or special JavaScript features beyond ES6+ syntax (specifically, rest parameters for the spread operator).

**Other Considerations**

When working with large arrays in JavaScript, it's essential to consider the trade-offs between code simplicity, performance, and compatibility. In this benchmark, we see that the `push.apply()` method outperforms other approaches, likely due to its optimized implementation and reduced overhead.

If you're writing a performance-critical part of your application, using the `push.apply()` method may be a good choice, but ensure it's compatible with your target browsers or environments. For general-purpose coding, the spread operator (`...`) is a great option when combined with modern JavaScript versions.

The benchmark results can serve as a useful reference for developers to compare different approaches and choose the best one based on their specific use cases and performance requirements.

Related benchmarks:

javascript LARGE concat vs spread operator vs push (version: 0)

Comparing performance of: concat vs spread operator vs push vs push apply

Created: 3 years ago by: Guest

Jump to the latest result

concat

spread operator

push

push apply

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):