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Battle of the Props - 2
(version: 0)
Comparing performance of:
Prop lookup vs Prop destructure
Created:
2 years ago
by:
Guest
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Tests:
Prop lookup
const o = {name: 'Jerry', age: 10}; const name = o.name; const age = o.age; console.log(`{name} is {age} years old`);
Prop destructure
const o = {name: 'Jerry', age: 10}; const {name, age} = o; console.log(`{name} is {age} years old`);
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Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Prop lookup
Prop destructure
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net. **What is being tested?** The provided benchmark definition and individual test cases measure the performance differences between two approaches to access properties in an object: "Prop lookup" (using dot notation) and "Prop destructure" (using destructuring assignment). In both cases, a simple object `o` is created with `name` and `age` properties. The first test case uses traditional dot notation to access these properties and logs the values to the console. The second test case uses destructuring assignment to extract the `name` and `age` properties from the `o` object and then logs their values. **Options compared:** 1. **Prop lookup (dot notation)**: * This approach involves directly accessing the properties of an object using a dot notation, e.g., `o.name`. * Pros: + Wide support across browsers and JavaScript engines. + Easy to read and write. * Cons: + May involve more overhead due to string lookup and property access in the browser's internal data structures. 2. **Prop destructure (destructuring assignment)**: * This approach involves using destructuring assignment to extract multiple properties from an object, e.g., `{name, age} = o;`. * Pros: + Often faster than dot notation due to optimized parsing and property access in modern JavaScript engines. + Can improve code readability by reducing the number of variable declarations. **Other considerations:** 1. **Object size**: The performance difference between these approaches may vary depending on the object size. For small objects, the impact is likely minimal. However, for larger objects, prop destructure might offer a performance boost. 2. **Browser and JavaScript engine variations**: Different browsers and JavaScript engines might optimize or implement these features differently, affecting their relative performance. 3. **Modernization and legacy support**: The newer approach (prop destructure) might be more desirable in modern development projects, but its adoption can impact compatibility with older JavaScript environments. **Library and special JS feature:** There is no specific library used in this benchmark. However, it's essential to note that the `const` keyword and template literals (`\r\n`) are part of ECMAScript standards (ECMAScript 2015).
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