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non-unique-elements
(version: 0)
Comparing performance of:
Count vs IndexOf
Created:
9 years ago
by:
Guest
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Script Preparation code:
var data=[]; for(var i=0;i<100;i++) data.push(i);
Tests:
Count
var cnt = {}; data.forEach(d => cnt[d] ? cnt[d]++ : cnt[d]=1); data.filter(d => cnt[d] > 1);
IndexOf
data.filter(d => data.indexOf(d) != data.lastIndexOf(d));
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
Run tests (2)
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Test case name
Result
Count
IndexOf
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 break down the provided JSON data and explain what is being tested on MeasureThat.net. **Benchmark Definition** The `Script Preparation Code` section defines a JavaScript benchmark that tests two different approaches: 1. **Count**: The script creates an object `cnt` to count the occurrences of each element in the `data` array using the `forEach` method. If an element is not already present in the `cnt` object, it adds it with a value of 1. Then, it filters the original `data` array to only include elements that have a value greater than their corresponding count in the `cnt` object. 2. **IndexOf**: The script uses the `filter` method to create an array that includes only elements from the original `data` array that are present at both the beginning and end of the array (i.e., `indexOf(d) != data.lastIndexOf(d)`). **Options Compared** The two approaches being tested differ in their use of: 1. **Object creation**: In the "Count" approach, an object `cnt` is created to store counts. In the "IndexOf" approach, no explicit object is used for counting. 2. **Method usage**: The "Count" approach uses `forEach` and `filter`, while the "IndexOf" approach directly uses `indexOf` and `lastIndexOf`. **Pros and Cons** 1. **Count Approach**: * Pros: More straightforward to understand and implement, as it explicitly counts elements using an object. * Cons: May be slower due to the creation of the `cnt` object and potential overhead of accessing its properties. 2. **IndexOf Approach**: * Pros: Might be faster since it avoids explicit counting and uses built-in methods that are optimized by the browser. * Cons: Less readable and maintainable, as the logic for creating a filtered array is more complex. **Library Usage** There are no libraries explicitly mentioned in the provided benchmark definition. However, some JavaScript engines may use internal libraries or optimizations under the hood. **Special JS Features or Syntax** Neither of the two approaches uses any special JavaScript features or syntax beyond what is considered standard (ECMAScript 2015).
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