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prepared lambda
(version: 0)
Comparing performance of:
lambda vs no lambda
Created:
2 years ago
by:
Guest
Jump to the latest result
Script Preparation code:
var x = []; for(i=0; i<1000; i++){ x.push(i) }
Tests:
lambda
let y = []; let l = (x,i) => x[i] for(i=0; i<1000; i++){ y[i] = l(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
llama3.2:3b
, generated one year ago):
I'll break down the provided benchmark information for you. **Benchmark Definition JSON** The benchmark definition is a set of scripts that define two test cases: 1. `prepared lambda`: This script prepares an array `x` and then pushes its elements to another array `y`. It uses a closure (a function that has access to its own scope) defined by the line `let l = (x, i) => x[i]`. 2. `no lambda`: This script creates an empty array `z` and then assigns the index of each element in `x` to it using a simple assignment. **Options Compared** The benchmark compares two approaches: 1. **Using a closure (`prepared lambda`)** 2. **Not using a closure (`no lambda`)** These options are compared in terms of performance, specifically the number of executions per second (ExecutionsPerSecond) measured across different browsers and devices. **Pros and Cons of Each Approach** * **Using a closure (`prepared lambda`):** + Pros: - More concise code - Can be more efficient since it avoids creating multiple functions to iterate over the array + Cons: - May have higher overhead due to function creation and lookup * **Not using a closure (`no lambda`)** + Pros: - Typically simpler code that's easier to understand + Cons: - Can be slower since it requires multiple iterations to access each element **Library/Tool Used** The benchmark uses JavaScript, which is the language being tested. No specific libraries are mentioned in the provided information. **Special JS Feature/Syntax** The `prepared lambda` script uses a feature of JavaScript called a **closure**, which allows a function to have access to its own scope and variables even when it's defined outside that scope. The line `let l = (x, i) => x[i]` defines an anonymous function (`l`) that takes two arguments (`x` and `i`) and returns the value of the element at index `i` in array `x`. This is a concise way to perform a simple lookup operation. **Alternative Approaches** Other approaches could be: 1. **Using `forEach()`**: Instead of using an explicit loop, you can use the `forEach()` method to iterate over the array. 2. **Using `map()`**: You can use the `map()` function to create a new array with transformed values, eliminating the need for indexing and looping. 3. **Using a library like Lodash**: Depending on the specific task, using a library like Lodash might provide optimized functions for common operations. Note that these alternatives may not be relevant to the specific benchmark case, but they could be explored in other contexts where similar performance optimizations are needed.
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