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custom function vs conversion to array+ at()
(version: 0)
Comparing performance of:
function vs convert to array
Created:
3 years ago
by:
Guest
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Tests:
function
function getLastValue(set){ let value; for(value of set); return value; } const map1 = new Map(); map1.set('a', []); map1.set('b', [{a:2}]); map1.set('c', [1,2,3,4]); getLastValue(map1); map1.delete('c'); getLastValue(map1);
convert to array
const map1 = new Map(); map1.set('a', []); map1.set('b', [{a:2}]); map1.set('c', [1,2,3,4]); [...map1].at(-1) || [] map1.delete('c'); [...map1].at(-1) || []
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Suite status:
<idle, ready to run>
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Test case name
Result
function
convert to array
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks. **Benchmark Overview** The provided JSON represents a benchmark test case on MeasureThat.net, where two different approaches are compared: using a custom function (`getLastValue`) and converting to an array with `at()` method. The goal is to determine which approach is faster for this specific use case. **Options Compared** Two options are being tested: 1. **Custom Function**: The first test case uses a custom function `getLastValue` that iterates over the Map using the `for...of` loop and returns the last value. 2. **Conversion to Array + at() Method**: The second test case converts the Map to an array using spread operator (`[...]`) and then accesses the last element using the `at()` method. **Pros and Cons of Each Approach** 1. **Custom Function (`getLastValue`)**: * Pros: + Simple and intuitive implementation. + No additional library dependencies required. * Cons: + The function iterates over all values in the Map, which may be inefficient for large Maps. + May not be optimized by the JavaScript engine. 2. **Conversion to Array + at() Method**: * Pros: + More efficient than iterating over all values in the Map. + Uses a well-known and widely supported method (at()) for accessing array elements. * Cons: + Requires conversion of the Map to an array, which may incur additional overhead. + May require additional library dependencies or imports. **Library Used** In this benchmark test case, the `Map` data structure is used. A Map is a built-in JavaScript object that stores key-value pairs and provides efficient iteration over its values. **Special JS Feature/Syntax** None of the provided code uses any special JavaScript features or syntax. **Other Considerations** When running benchmarks like this, it's essential to consider factors such as: * **Garbage collection**: The frequency and duration of garbage collections can impact performance. * **Cache effects**: The order in which values are accessed in the Map may affect cache behavior. * **Platform and browser variations**: Different platforms and browsers may have varying implementation details or optimizations for Map operations. **Alternatives** If you were to create a similar benchmark test case, consider exploring other approaches, such as: * Using `for...in` loop instead of `for...of` loop in the custom function. * Implementing a custom iterator for the Map data structure. * Comparing performance with different data structures, like arrays or linked lists. Keep in mind that JavaScript engine optimizations and implementation details may influence the results. Be sure to consider these factors when creating and interpreting benchmark test cases.
Related benchmarks:
array.prototype.at() vs array[array.length - 1]
array[array.length - 1] vs array.at(-1)
array[] vs array.at()
array[2] vs array.at(2)
array[index] vs array.at(index)
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