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for vs find vs map vs foreach just longer
(version: 0)
Comparing performance of:
for vs prototype.find vs forEach vs map
Created:
4 years ago
by:
Guest
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Script Preparation code:
var arr = [] let i = 0 let len = 10000 for(;i<len;i++) { arr.push(i) }
Tests:
for
let i = 0 let len = arr.length for(;i<len;i++) { if (arr[i] > 9999){ return i } }
prototype.find
const found = arr.find(function(element) { return element > 9999 })
forEach
let foundForEachIndex = -1 arr.forEach(function (item){ if (item[i] > 9999){ foundForEachIndex = i return } })
map
let foundMapIndex = arr.map(item => { if (item[i] > 9999){ return i } })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
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Test case name
Result
for
prototype.find
forEach
map
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 dive into the world of JavaScript microbenchmarks on MeasureThat.net. **What is being tested?** The benchmark tests four different approaches to find an element in an array that meets a certain condition: 1. **For loop**: A traditional for loop that iterates through the array using an index variable. 2. **Find method**: The `find` method, which returns the first element in the array that satisfies a provided function. 3. **ForEach loop**: A foreach loop that iterates through the array, and checks each element against the condition. 4. **Map method**: The `map` method, which creates a new array with the results of applying a provided function to each element in the original array. **Options compared** The benchmark compares the performance of these four approaches: * For loop: Iterates through the array using an index variable and checks each element against the condition. * Find method: Returns the first element that satisfies the condition, without explicitly iterating through the entire array. * Foreach loop: Iterates through the array, but only checks each element against the condition if it's within the bounds of the array. * Map method: Creates a new array with the results of applying the condition to each element, without modifying the original array. **Pros and cons of each approach** Here's a brief summary: * **For loop**: Pros - explicit control, no overhead from function calls. Cons - requires manual indexing, can be error-prone. * **Find method**: Pros - concise, efficient, and easy to read. Cons - may not terminate early if the array is large or contains elements that don't match. * **ForEach loop**: Pros - similar to find method, but still has some overhead from function calls. Cons - requires manual indexing, can be error-prone. * **Map method**: Pros - creates a new array with results, no modifications to original array. Cons - may have higher overhead than other methods. **Library usage** None of the benchmark definitions use any external libraries or modules. The code is pure JavaScript. **Special JS features or syntax** The benchmarks use some special JavaScript features: * **Template literals**: Used in the `map` method definition to create a new array with concise syntax. * **Arrow functions**: Used in the `forEach` and `map` methods to define small, anonymous functions. However, these features are not specific to these particular benchmark definitions and can be used in other JavaScript contexts as well. **Other alternatives** There are other approaches to find an element in an array that meet the condition: * Using `indexOf` method with a callback function * Using regular expressions (regex) * Using bitwise operations to optimize performance However, these alternatives are not included in this benchmark and may have their own trade-offs in terms of readability, maintainability, and performance. Overall, this benchmark provides a useful comparison of four common approaches to find an element in an array that meets a certain condition.
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