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destruct and test vs. property access test for type
(version: 0)
Use destruct syntax let {x} = config; if(x){} compared to if(typeof config.x === 'string'){}
Comparing performance of:
destructor vs old school
Created:
6 years ago
by:
Registered User
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Tests:
destructor
let config = {x:1, y:'foo', z: {here:true}}; let a, b, c; function run(conf){ let {x,y,z} = config; if(x && typeof x === 'number'){ a = x; } if(y && typeof y === 'string'){ b = y; } if(z && typeof z === 'object' && z.here){ c = z } } run(config);
old school
let config = {x:1, y:'foo', z: {here:true}}; let a, b, c; function run(conf){ if(conf.x && typeof conf.x === 'number'){ a = conf.x; } if(conf.y && typeof conf.y === 'string'){ b = conf.y; } if(conf.z && typeof conf.z === 'object' && conf.z.here){ c = conf.z } } run(config);
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
destructor
old school
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**What is being tested?** The provided JSON benchmark defines two test cases: 1. **"destruct and test vs. property access test for type"**: This test case compares the performance of using destruct assignment (`let {x} = config;`) versus traditional property access (`if(typeof config.x === 'string'){}`). 2. **Individual test cases**: These are two separate tests that use different approaches to extract values from an object. **Options being compared:** * Destruct assignment (`let {x} = config;`) * Traditional property access (`if(typeof config.x === 'string'){}`) * Object destructuring with conditional checks (`if(z && typeof z.here){ c = z }`) **Pros and Cons of each approach:** 1. **Destruct assignment (let {x} = config;)** * Pros: + More concise and readable code + Reduces the need for explicit type checks * Cons: + May be slower due to the overhead of creating a new object 2. **Traditional property access (`if(typeof config.x === 'string'){}`)) * Pros: + Faster, as it avoids the overhead of creating a new object * Cons: + More verbose and less readable code 3. **Object destructuring with conditional checks (`if(z && typeof z.here){ c = z }`)) * Pros: + Balances conciseness with explicit type checks * Cons: + May be slower due to the overhead of conditional checks **Libraries and their purposes:** None mentioned in the provided JSON. **Special JS features or syntax:** 1. **Destruct assignment**: This feature is supported by modern JavaScript engines, including Firefox 71. 2. **Object destructuring with conditional checks**: Also supported by modern JavaScript engines, including Firefox 71. **Other considerations:** * The use of `run` as a function name for both test cases seems unnecessary and might be an anti-pattern. * The benchmark results show that the "old school" approach (traditional property access) is faster than the "destructor" approach (destruct assignment with conditional checks). **Alternatives:** * Other approaches to extract values from objects, such as using `Object.keys()` or `for...in` loops. * Alternative ways to structure the benchmark tests, such as using different data structures or testing different scenarios. Note that this analysis assumes a basic understanding of JavaScript and its features. If you have specific questions or need further clarification on any point, feel free to ask!
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