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checking if nodeValue is equal vs simply setting it
(version: 0)
Comparing performance of:
checking previous text vs setting nodeValue
Created:
5 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var text = document.createTextNode("hello world"); var newNodeValue = "hello world";
Tests:
checking previous text
if (text.nodeValue !== newNodeValue) { text.nodeValue = newNodeValue; }
setting nodeValue
text.nodeValue = newNodeValue;
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
checking previous text
setting nodeValue
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 break down the benchmark and its test cases. **Benchmark Purpose** The purpose of this benchmark is to compare two approaches for setting or checking the `nodeValue` property of an HTML `textNode`. The test cases aim to measure which approach is faster and more efficient in terms of execution time. **Test Cases** There are two test cases: 1. **Checking previous text**: This test case checks if the current value of `nodeValue` is equal to the expected value (`newValue`). If not, it sets the `nodeValue` property. 2. **Setting nodeValue**: This test case simply sets the `nodeValue` property directly. **Options Compared** The two options being compared are: 1. Checking equality using `!==` operator 2. Direct assignment using simple syntax (`text.nodeValue = newNodeValue;`) **Pros and Cons of Each Approach** **Checking Equality using `!==` Operator:** Pros: * Provides a clear indication if the value has changed * Can be used in conditional statements Cons: * May incur additional overhead due to the comparison operation **Direct Assignment using Simple Syntax:** Pros: * Directly sets the value without any intermediate operations * May be faster and more efficient, as it eliminates the need for a comparison operation Cons: * Does not provide a clear indication if the value has changed * May lead to silent failures or unexpected behavior if the assignment fails **Library Usage:** None of the test cases use any external libraries. However, the benchmark is likely using some internal JavaScript implementation details that are not exposed publicly. **Special JS Feature/Syntax:** There are no special JavaScript features or syntax used in this benchmark that would require specific knowledge to understand. **Other Alternatives:** If you were to rewrite this benchmark with different test cases or approaches, you might consider adding scenarios such as: * Using a different data type (e.g., string vs. number) * Introducing errors or invalid values during the comparison or assignment * Using more complex DOM structures or node types * Measuring the impact of parallel execution or concurrent testing on performance By experimenting with these alternative test cases, you could gain a deeper understanding of the nuances and challenges involved in optimizing JavaScript performance.
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textContent vs. innerText vs. nodeValue
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