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getTime() vs +new Date()
(version: 2)
Comparing performance of:
A vs B vs C vs D
Created:
8 years ago
by:
Registered User
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Script Preparation code:
var a = -1000000000;
Tests:
A
(new Date()).getTime()
B
+new Date()
C
Date.now()
D
a++
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
A
B
C
D
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 its test cases. **Benchmark Definition** The benchmark definition is a JSON object that represents the main test case. In this case, it's a simple comparison between three different ways to get the current time in JavaScript: * `(new Date()).getTime()` * `+new Date()` * `Date.now()` These expressions are all used to measure the execution speed of each method. **Options Compared** The three options being compared are: 1. Using the `Date` object's `getTime()` method. 2. Using the unary plus operator (`+`) with the `Date` object. 3. Using the `Date.now()` method, which is a non-polyfill implementation of `getTime()`. **Pros and Cons** * **Using `Date.getTime()`:** + Pros: This method is widely supported across browsers and versions. + Cons: It may be slower than other methods due to the overhead of calling a method on an object. * **Using `+new Date():`** + Pros: This method can be faster because it uses a simple arithmetic operation, which may be optimized by the browser. + Cons: This method is not supported in older browsers and versions, and its behavior may vary depending on the context (e.g., when used as an expression or assigned to a variable). * **Using `Date.now():`** + Pros: This method is a non-polyfill implementation of `getTime()`, so it's faster than calling a method. + Cons: It's not supported in older browsers and versions, which may limit its usefulness. **Libraries and Special Features** There are no libraries mentioned in the benchmark definition. However, it's worth noting that some browsers have their own optimizations for these methods: * `Date.getTime()` is often implemented using a simple arithmetic operation to get the high 16 bits of the timestamp. * `+new Date()` can be optimized by the browser if used as an expression (e.g., in a calculation). * `Date.now()` uses a combination of the current time and a seed value to generate a unique timestamp. **Other Considerations** When measuring execution speed, it's essential to consider factors like: * Cache locality: Is the code being executed cache-friendly? * Branch prediction: Are the branches in the code likely to be mispredicted? * CPU architecture: How will the results vary depending on the CPU architecture (e.g., x86 vs. ARM)? **Alternatives** Other alternatives for measuring execution speed might include: * Measuring the time it takes to execute a specific function or method. * Using a benchmarking framework like BenchmarkJS or jsperf. * Using a profiling tool like Chrome DevTools' Profiler or Firefox's Web Developer Tools. Keep in mind that each alternative has its own strengths and weaknesses, and the best approach will depend on the specific use case and requirements.
Related benchmarks:
Date.now() vs new Date().getTime()
new Date().getTime() vs Date.now()
Date.now() vs new Date().getTime(qu)
Date.now() - Date.now() vs new Date() - new Date()
Date.parse vs getTime()
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