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forinfororfor*for
(version: 0)
fororfor
Comparing performance of:
forinfor vs for*for
Created:
4 years ago
by:
Guest
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Script Preparation code:
var a = new Array(1000), random = Math.random, global, floor = Math.floor; for(let i = 0; i < 1000; i++) a[i] = new Array(10).fill(random());
Tests:
forinfor
let length = a.length; for(let i = 0; i < length; i++) { let module = a[i]; for(let i2 = 0; i2 < module.length; i2++) global = module[i2]; }
for*for
let aLength = a[0].length; let length = a.length * aLength; for(let i = 0; i < length; i++) { let i2 = i % aLength, i3 = floor(i / aLength); global = a[i3][i2]; }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
Previous results
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Test case name
Result
forinfor
for*for
Fastest:
N/A
Slowest:
N/A
Latest run results:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the provided benchmark definition and test cases to understand what is being tested. **Benchmark Definition** The benchmark definition provides a script preparation code that creates an array `a` of 1000 elements, each containing another array of 10 elements filled with random values. It also defines some global variables: `random`, which is a reference to the built-in `Math.random()` function, and `floor`, which is a reference to the built-in `Math.floor()` function. The script then uses two different approaches to iterate over the inner arrays: 1. **forin**: This approach uses the `for...in` loop to iterate over the outer array `a`, and for each element in `a`, it uses another `for...in` loop to iterate over the inner array. 2. **for*for**: This approach uses a simple loop with two variables, `i2` and `i3`, to index into the inner arrays. **Test Cases** The benchmark definition includes two individual test cases: 1. **forinfor**: This test case uses the `for...in` loop to iterate over the outer array `a`, and for each element in `a`, it uses another `for...in` loop to iterate over the inner array. 2. **for*for**: This test case uses a simple loop with two variables, `i2` and `i3`, to index into the inner arrays. **Options Compared** The benchmark is comparing two different approaches: 1. **forinfor**: Uses nested `for...in` loops 2. **for*for**: Uses a simple loop with two indexed variables **Pros and Cons** * **forinfor**: Pros: * Can be more intuitive for developers familiar with the `for...in` loop. * May be faster due to the ability to use the loop's index directly. * Cons: * Can lead to slower performance due to the overhead of repeated property lookups. * **for*for**: Pros: * Typically faster due to the reduced overhead of repeated property lookups. * More cache-friendly, as it accesses elements in a more linear order. * Cons: * May be less intuitive for developers unfamiliar with indexed loops. **Library and Special JS Features** There are no libraries mentioned in the benchmark definition. However, `for...in` loop is a built-in JavaScript feature that allows iterating over an object's properties. No special JavaScript features are used in this benchmark. **Alternatives** Other alternatives to compare could include: * Using `Array.prototype.forEach()` instead of `for...in` * Using a single loop with `i2` and `i3` variables for both inner arrays * Using an array of indices instead of two separate loops
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