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Create Date
(version: 0)
Comparing performance of:
New vs Reuse
Created:
9 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var start = new Date(); var temp1 = new Date();
Tests:
New
var new1 = new Date(start).setHours(0,0,0,0).getTime();
Reuse
temp1.setTime(start); temp1.setHours(0,0,0,0); var new1 = temp1.getTime();
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
New
Reuse
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks and explore what's being tested in this specific benchmark. **Benchmark Definition** The provided JSON represents a benchmark definition, which outlines the basic setup for the test. In this case: * The "Name" field specifies the name of the benchmark: "Create Date". * The "Description" field is empty, indicating that there isn't a detailed description of what's being tested. * The "Script Preparation Code" section provides two lines of JavaScript code: + `var start = new Date();`: Creates a new `Date` object and assigns it to the variable `start`. + `var temp1 = new Date();`: Creates another new `Date` object, which will be used for comparison later. * The "Html Preparation Code" section is empty, indicating that no HTML preparation code is required. **Individual Test Cases** There are two test cases defined: 1. **New**: This test case measures the time it takes to create a new `Date` object and then set its hour, minute, second, and millisecond to 0 using the `setHours`, `setMinutes`, `setSeconds`, and `setMilliseconds` methods. The resulting timestamp is extracted from the new `Date` object using the `getTime()` method. 2. **Reuse**: This test case measures the time it takes to create a new `Date` object, store its timestamp in a variable (`temp1`), and then reuse this original `Date` object by calling the `setTime` method with the stored timestamp. The resulting timestamp is extracted from the reused `Date` object using the `getTime()` method. **Options Compared** The two test cases compare the performance of creating a new `Date` object versus reusing an existing one, specifically: * Creating a new `Date` object (Test Case "New") * Reusing an existing `Date` object by calling its `setTime` method (Test Case "Reuse") **Pros and Cons** **New**: Pros: * Simple to understand and implement * Allows for direct comparison of creating a new `Date` object with its resulting performance Cons: * May incur additional overhead due to the creation of a new object, potentially affecting performance **Reuse**: Pros: * Reduces memory allocation and garbage collection overhead compared to creating a new object * Reuses an existing object, minimizing unnecessary computations Cons: * Requires calling `setTime` on an existing object, which may have additional overhead or side effects * May not accurately reflect the creation performance if the reuse operation is not optimal **Other Considerations** * The `Date` object's internal implementation and browser optimizations can affect the results. For example, some browsers might cache or optimize the `setTime` method for reused objects. * The use of `getTime()` to extract timestamps from the `Date` objects may also introduce additional overhead. **Alternatives** Some possible alternatives to this benchmark could be: * Comparing other methods for creating a `Date` object, such as using `new Date('1970-01-01T00:00:00')` * Investigating performance differences between different browser engines (e.g., Chrome vs. Firefox) * Exploring the impact of various optimizations or caching strategies on the creation and reuse of `Date` objects Keep in mind that these alternatives might not be directly related to the specific questions being asked by this benchmark, but they could provide additional insights into the performance characteristics of JavaScript code.
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