Toggle navigation
MeasureThat.net
Create a benchmark
Tools
Feedback
FAQ
Register
Log In
Map.set() vs Object assignment in loops
(version: 0)
Comparing performance of:
for-loop + Map.set vs for-loop + Object assignment vs forEach + Map.set vs forEach + Object assignment
Created:
4 years ago
by:
Guest
Jump to the latest result
Tests:
for-loop + Map.set
const obj = {} const map = new Map() const n = 1000000; for (let i = 0; i < n; i++) { map.set(i, i); }
for-loop + Object assignment
const obj = {} const map = new Map() const n = 1000000; for (let i = 0; i < n; i++) { obj[i] = i; }
forEach + Map.set
const obj = {} const map = new Map() const n = Array(1000000).fill(0) n.forEach((value, index) => { map.set(index, index); })
forEach + Object assignment
const obj = {} const map = new Map() const n = Array(1000000).fill(0) n.forEach((value, index) => { obj[index] = index; })
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (4)
Previous results
Fork
Test case name
Result
for-loop + Map.set
for-loop + Object assignment
forEach + Map.set
forEach + Object assignment
Fastest:
N/A
Slowest:
N/A
Latest run results:
No previous run results
This benchmark does not have any results yet. Be the first one
to run it!
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's break down the benchmark and explain what's being tested, compared options, pros and cons of each approach, and other considerations. **Benchmark Description** The benchmark compares three approaches to assigning values to an object or a Map in JavaScript: 1. **For-loop + Object assignment**: Using a traditional for loop to iterate over a range of numbers and assign each value to the object using the dot notation (e.g., `obj[i] = i;`). 2. **For-loop + Map.set**: Using a for loop to iterate over a range of numbers and add entries to a Map using the `set()` method (e.g., `map.set(i, i);`). 3. **ForEach + Object assignment**: Using the Array.prototype.forEach() method to iterate over an array and assign each value to the object using the dot notation. 4. **ForEach + Map.set**: Using the Array.prototype.forEach() method to iterate over an array and add entries to a Map using the `set()` method. **Libraries and Features Used** In this benchmark, only built-in JavaScript libraries and features are used. There are no external libraries or frameworks involved. **Approach Comparison** Here's a brief summary of each approach: * **For-loop + Object assignment**: This approach uses traditional iteration and assignment using the dot notation. It's a straightforward and widely supported method. + Pros: Easy to understand, well-supported by most browsers. + Cons: May be slower due to the overhead of dynamic property access. * **For-loop + Map.set**: Using `Map.set()` is an efficient way to add entries to a Map. This approach leverages the optimized implementation of the `set()` method. + Pros: Efficient, fast, and optimized by browsers. + Cons: May require more memory allocation due to the use of a Map. * **ForEach + Object assignment**: This approach uses the Array.prototype.forEach() method to iterate over an array. It's a concise way to perform iteration. + Pros: Concise, efficient, and well-supported by most browsers. + Cons: May be slower due to the overhead of function invocation and callback execution. * **ForEach + Map.set**: Using `Map.set()` within a forEach loop is an efficient way to add entries to a Map while iterating over an array. This approach combines the benefits of both methods. + Pros: Efficient, fast, and optimized by browsers. + Cons: May require more memory allocation due to the use of a Map. **Other Considerations** When interpreting these results, keep in mind: * **Execution frequency**: The number of executions per second is used as the benchmark metric. Higher values indicate faster execution. * **Device platform**: The test was run on a Mac OS X 10.15.7 system with a Chrome 97 browser. This may not be representative of all platforms or browsers. * **Memory allocation**: The use of a Map for `Map.set()` and array for `forEach` methods might impact memory usage. **Alternatives** If you're interested in exploring alternative approaches, consider: * Using other data structures like Sets or WeakMaps * Investigating the performance of different iteration methods (e.g., `while`, `for...of`) * Examining the impact of caching or memoization on the benchmark results Keep in mind that these alternatives might not be relevant to the specific problem being solved, and may introduce additional complexity.
Related benchmarks:
Create Map/Set vs reuse Map/Set
Array from() vs Map.keys()
Array from() vs Map.keys() vs Map.values() vs spread
Map.forEach vs Array.forEach vs Array.from(Map.prototype.values()).forEach
new Map vs set array to map
Comments
Confirm delete:
Do you really want to delete benchmark?