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CanvasTest
(version: 0)
Comparing performance of:
offsetWidth - Clear vs offsetWidth - No Clear vs canvas
Created:
2 years ago
by:
Guest
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HTML Preparation code:
<div id="testDiv"></div>
Script Preparation code:
const canvas = document.createElement('canvas') window.context = canvas.getContext('2d') window.globalThis.str0 = "Hello0"; window.globalThis.str1 = "Hello1"; window.globalThis.iterations = 100; window.globalThis.d = document.getElementById("testDiv");
Tests:
offsetWidth - Clear
for (let i = 0; i < window.globalThis.iterations; i++){ if(i % 2 == 0){ window.globalThis.d.innerText = window.globalThis.str0; } else { window.globalThis.d.innerText = window.globalThis.str1; } const w = d.offsetWidth; window.globalThis.d.innerText = ""; }
offsetWidth - No Clear
for (let i = 0; i < window.globalThis.iterations; i++){ if(i % 2){ window.globalThis.d.innerText = window.globalThis.str0; } else { window.globalThis.d.innerText = window.globalThis.str1; } const w = window.globalThis.d.offsetWidth; }
canvas
for (let i = 0; i < window.globalThis.iterations; i++){ const s = i % 2 ? window.globalThis.str0 : window.globalThis.str1; const w = window.context.measureText(s); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
Previous results
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Test case name
Result
offsetWidth - Clear
offsetWidth - No Clear
canvas
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview of the Benchmark** The provided benchmark, `CanvasTest`, is designed to measure the performance of different approaches for updating the text content and width of an HTML element in JavaScript. The benchmark consists of three test cases: 1. `offsetWidth - Clear`: Updates the text content and clears it immediately after setting the new value. 2. `offsetWidth - No Clear`: Updates the text content without clearing it. 3. `canvas`: Uses the Canvas API to measure the text width. **Options Compared** The benchmark compares three different approaches: 1. **Clearing the text content**: This approach involves updating the text content and then immediately clearing it using `window.globalThis.d.innerText = "";`. This simulates a common use case where the element's text content needs to be updated frequently. 2. **No-clearing the text content**: This approach updates the text content without clearing it, which can lead to better performance if the element's text content is updated infrequently. 3. **Canvas API**: This approach uses the Canvas API to measure the text width, which provides more accurate results but may have a higher overhead compared to the other two approaches. **Pros and Cons of Each Approach** 1. **Clearing the text content**: * Pros: Simulates common use cases where text content needs to be updated frequently. * Cons: Can lead to performance issues if the element's text content is updated infrequently. 2. **No-clearing the text content**: * Pros: Can improve performance when updating the element's text content infrequently. * Cons: May not accurately simulate real-world use cases where the text content needs to be cleared. 3. **Canvas API**: * Pros: Provides accurate results for measuring text width, especially in scenarios with variable-width fonts or complex layouts. * Cons: May have a higher overhead compared to the other two approaches due to the additional computation required by the Canvas API. **Library and Special JS Feature** The benchmark uses the `window.globalThis` object, which is a way of accessing the global scope from within an IIFE (Immediately Invoked Function Expression) or ES modules. This is not a specific library, but rather a convention used in some JavaScript environments to access the global scope. There are no special JS features or syntax used in this benchmark. The code relies solely on standard JavaScript features and APIs.
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