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Push to array vs Bitwise Mask
(version: 0)
Comparing performance of:
Push to array vs Bitwise Mask
Created:
6 years ago
by:
Guest
Go to the latest result
Script Preparation code:
var PUSH_BIT = 4;
Tests:
Push to array
const a = [] a.push("test")
Bitwise Mask
let mask = 0; mask |= PUSH_BIT;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
Push to array
Bitwise Mask
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
7 months ago
)
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:146.0) Gecko/20100101 Firefox/146.0
Browser/OS:
Firefox 146 on Windows
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<iframe src="https://measurethat.net/Embed?id=623268" width="100%" height="500px"></iframe>
Bitwise Mask
485.8M/s
Push to array
26.8M/s
View exact numbers
Test name
Executions per second
✓
Bitwise Mask
485,837,056 Ops/sec
Push to array
26,808,818 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Definition** The provided JSON represents a JavaScript microbenchmark that compares two approaches: pushing an element to an array using the `push()` method, and using bitwise masking with the `|=` operator. **Script Preparation Code** The script preparation code defines a constant `PUSH_BIT` as 4. This value will be used in the benchmark tests. **Html Preparation Code** There is no HTML preparation code provided, which means that only JavaScript code is being executed for these benchmarks. **Individual Test Cases** There are two test cases: 1. **Push to array**: This test case defines an empty array `a` and pushes a string `"test"` onto it using the `push()` method. 2. **Bitwise Mask**: This test case defines a variable `mask` initialized to 0, and then uses the bitwise OR assignment operator (`|=`) with the value of `PUSH_BIT` (4). **Library** There is no explicit library mentioned in the benchmark definition or test cases. **Special JS Feature or Syntax** The use of the `|=` operator (bitwise OR assignment) might be unfamiliar to some developers. The `|=` operator performs a bitwise OR operation on its left operand and assigns the result back to the same variable. In this case, it's used to set a specific bit in the `mask` variable. **Pros and Cons of Approaches** 1. **Pushing to array**: This approach is straightforward and easy to understand. However, it may be slower due to the overhead of pushing an element onto an array. 2. **Bitwise Mask**: Using bitwise masking can be faster because it directly sets a specific bit in the `mask` variable without creating an intermediate array or performing any additional operations. **Other Considerations** * The `Push_BIT` constant is defined as 4, which likely corresponds to the binary representation of 4 (100). This value is used for setting the fourth bit in the `mask` variable. * The test cases are designed to compare the performance of these two approaches, but other factors like memory allocation, stack size, or specific hardware features might also impact performance. **Alternative Approaches** Other alternatives that might be considered in a benchmarking scenario: * Using `Array.prototype.push()` with a small array (e.g., `[1, 2, 3]`) instead of an empty array. * Comparing the performance of using `push()` vs. creating a new array and assigning it to a variable (`let arr = [...]; arr.push("test")`). * Using different data types or structures (e.g., `Set`, `Map`, or objects) for comparison. Keep in mind that the specific alternatives will depend on the requirements of the benchmark and the test scenarios being evaluated.
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