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map foreach vs array lookup
(version: 0)
Comparing performance of:
arr to map lookup vs map foreach
Created:
4 years ago
by:
Guest
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Script Preparation code:
var arr = []; var map = new Map(); for (let i = 0; i < 12000; i++) { const num = i * 7 + Math.ceil(Math.random() * 5); const str = (Math.random() + 1).toString(36).substring(7); arr.push(num); map.set(num, str); }
Tests:
arr to map lookup
for (let i = 0;i < arr.length; i++) { let num = arr[i]; let str = map.get(num) || ''; }
map foreach
map.forEach((el)=>{})
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
arr to map lookup
map foreach
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested. **Benchmark Overview** The benchmark compares two approaches for iterating over an array when you need to look up values in a Map (a built-in JavaScript data structure). The tests aim to measure which approach is faster, more efficient, or both. **Approaches Compared** There are two main approaches compared: 1. **Direct Array Lookup**: This involves using the `map.get()` method to directly access the value associated with each key in the array. 2. **Map.forEach()**: This involves using the `forEach` method on the Map object to iterate over its entries. **Pros and Cons** **Direct Array Lookup (arr to map lookup)** Pros: * More explicit and readable code * Can be more efficient if you know exactly which key to look up * No unnecessary overhead from iterating over all keys in the Map Cons: * Requires more manual work to set up the lookup * May not be as scalable or performant for large datasets **Map.forEach() (map foreach)** Pros: * Simplifies the code and makes it easier to read * Can be more efficient when dealing with large datasets, since `forEach` will only iterate over keys that are actually present in the Map * Less manual work required compared to direct array lookup Cons: * May have unnecessary overhead due to iteration over all keys in the Map * Can be less readable if not used carefully **Library Usage** The benchmark uses the built-in JavaScript `Map` object, which is a simple key-value store that allows you to look up values by their corresponding keys. **Special JavaScript Features/Syntax** There are no special JavaScript features or syntax mentioned in the benchmark. It's purely focused on comparing two approaches for iterating over an array when using a Map. **Other Alternatives** Other alternatives to consider when dealing with arrays and Maps include: * Using `Object.keys()` or `Array.prototype.forEach()` to iterate over keys, instead of directly accessing them through the `map.get()` method * Using other data structures like Sets or Objects to store and look up values * Optimizing the code for specific use cases, such as using caching or memoization techniques I hope this explanation helps!
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