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Object VS Map VS Array
(version: 0)
Comparing performance of:
Object vs Array vs Map
Created:
3 years ago
by:
Guest
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Tests:
Object
var b = {} for (var i = 0; i < 5000; i++) { b[i] = i; }
Array
var c = [] for (var i = 0; i < 5000; i++) { c[i] = i }
Map
var a = new Map(); for (var i = 0; i < 5000; i++) { a.set(i, i); }
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
Object
Array
Map
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 provided benchmark and its components. **Benchmark Purpose:** The goal of this benchmark is to compare the performance of three data structures in JavaScript: 1. **Object:** An object is an unordered collection of key-value pairs. In this benchmark, we're creating an object with 5000 properties, where each property has a unique integer value. 2. **Array:** An array is a collection of values that can be accessed by their index. Here, we're creating an array of length 5000 and assigning each element a unique integer value using a for loop. 3. **Map:** A map (also known as an object in some browsers) is a data structure that stores key-value pairs. In this benchmark, we're creating a Map with 5000 entries, where each entry has a unique integer key and corresponding value. **Benchmark Comparison:** The benchmark compares the performance of these three data structures under different conditions. The test cases are identical, except for the data structure used to create the initial collection: * **Object:** Creates an object using the literal syntax (`var b = {}`). * **Array:** Creates an array using the constructor syntax (`var c = []`). * **Map:** Creates a Map using the `new Map()` constructor. **Library and Special Features:** There are no libraries used in this benchmark. The only special feature is that each data structure uses a for loop to populate its elements, which can vary depending on the browser's internal optimizations. **Pros and Cons of Different Approaches:** * **Object:** Creates an object using the literal syntax. * Pros: More concise syntax, easier to read and write. * Cons: Can be less efficient due to the overhead of object creation and property access. * **Array:** Creates an array using the constructor syntax. * Pros: More flexible than objects for indexed data, can take advantage of optimized array operations in browsers. * Cons: Less concise syntax compared to objects, might require additional steps to achieve similar functionality. * **Map:** Creates a Map using the `new Map()` constructor. * Pros: Offers better performance and memory efficiency for key-value pairs, can be more convenient than objects when dealing with large datasets. * Cons: Syntax might seem less familiar or less intuitive to some developers compared to objects. **Alternatives:** Other alternatives to consider when working with data structures in JavaScript include: * **Set:** A set is an unordered collection of unique values. It's useful for storing collections of unique elements, but it doesn't maintain the order in which elements were added. * **WeakMap:** A weak map is a variant of Map that allows keys to be garbage collected when they are no longer referenced. This makes it useful for caching or other scenarios where keys may become unnecessary over time. Each data structure has its strengths and weaknesses, and the choice ultimately depends on your specific use case and requirements.
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Array.from() vs new Array().map()
new Map vs set array to map
Array Spread vs Fill vs New Array
Object.fromEntries vs Map
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