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lambdas2
(version: 0)
Comparing performance of:
lambda vs no lambda
Created:
5 years ago
by:
Guest
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Script Preparation code:
var x = []; for(i=0; i<1000; i++){ x.push(i) }
Tests:
lambda
let y = []; for(i=0; i<1000; i++){ y[i] = (() => x[i])() }
no lambda
let z = []; for(i=0; i<1000; i++){ z[i] = x[i] }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
lambda
no lambda
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.1:latest
, generated one year ago):
Let's dive into the benchmark results. **Benchmark Overview** The benchmark measures the performance of two different approaches to accessing array elements in JavaScript: using a lambda function (`(() => x[i])()`) and simply accessing the element directly (`x[i]`). **Test Cases** There are two test cases: 1. **"lambda"**: This test case uses a lambda function to create an immediately invoked expression that returns the `i-th` element of array `x`. The lambda function is assigned to each index in array `y`. 2. **"no lambda"**: This test case simply assigns the `i-th` element of array `x` to each index in array `z`. **Library Used** No external library is used in this benchmark. **Special JS Features or Syntax** The only special JavaScript feature used is the **lambda function**, which is a concise way to create small, single-expression functions. In this case, the lambda function `(() => x[i])()` creates an expression that returns the `i-th` element of array `x`. **Pros and Cons** Here are some pros and cons of each approach: * **"no lambda"**: Pros: + Simple and straightforward + Easy to read and understand + No extra overhead + Most browsers will optimize this code efficiently Cons: + Not as concise or expressive as the lambda function * **"lambda"**: Pros: + Concise and expressive syntax + Can be useful for small, one-time calculations + May provide some performance benefits in certain cases (though not significant in this benchmark) Cons: + Less readable than simple assignment + May introduce extra overhead due to function invocation **Other Alternatives** In addition to the two test cases provided, here are some other alternatives: * **Using a getter method**: Instead of using a lambda function or simple assignment, you can define a getter method on an object that returns the `i-th` element of array `x`. * **Using Array.prototype.map()**: You can use the `map()` method to create a new array with the desired elements, which can be more efficient than accessing individual elements. * **Using Array.prototype.at()**: This method (supported in modern browsers) allows you to access an element by its index using a more concise syntax. These alternatives may provide better performance or conciseness in certain scenarios, but for this specific benchmark, the results show that simple assignment (`x[i]`) is still the most efficient approach.
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