Benchmark: Javascript array deducplication 2

Script Preparation code:

function m(l1, l2) {
    var u = [];
    for (var i = 0; i < l1.length; i++) {
        u.push(l1[i]);
    }
    for (var j = 0; j < l2.length; j++) {
        var dupe = false;
        for (var i = 0; i < l1.length; i++) {
            if (l1[i] === l2[j]) {
                dupe = true;
            }
        }
        if (!dupe) {
            u.push(l2[j]);
        }
    }
    return u;
}

function n(l1, l2) {
    let combined = [].concat(l1, l2);
    return [...new Set(combined)];
}

Array.prototype.unique = function() {
    var a = this.concat();
    for(var i=0; i<a.length; ++i) {
        for(var j=i+1; j<a.length; ++j) {
            if(a[i] === a[j])
                a.splice(j--, 1);
        }
    }

    return a;
};


function usingForEach(l1,l2){
    let u = [];

    l1.forEach(function(item){
        if(u.indexOf(item)<0)
            u.push(item);
    });

    l2.forEach(function(item){
        if(u.indexOf(item)<0)
            u.push(item);
    });

    return u;
}

var a = [1, 2, 3, 4, 5];
var b = [3, 3, 4, 5, 5, 6, 7];

Tests:

m
var testM = m(a, b);
n
var testN = n(a, b);
unique
var testUnique = a.concat(b).unique();
ForEACH
var testY = usingForEach(a,b);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
m
n
unique
ForEACH

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and options:

**Benchmark Definition:**

The benchmark is testing two main functions:

1. `m(l1, l2)`: This function creates an array `u` by pushing elements from `l1` into it and then checks if each element in `l2` already exists in `l1`. If it does, the element is not pushed into `u`.
2. `n(l1, l2)`: This function combines `l1` and `l2` into a single array using the spread operator (`...`) and then uses the `Set` data structure to remove duplicates.
3. `unique()`: This is a custom method that modifies the original array by removing duplicate elements.
4. `usingForEach(l1, l2)`: This function iterates over both arrays and checks if each element exists in the other array. If it does, the element is not pushed into the result array.

**Options Compared:**

The benchmark is comparing different approaches to remove duplicates from two arrays:

* Method 1: `m(l1, l2)`
* Method 2: `n(l1, l2)`
* Method 3: `unique()`
* Method 4: `usingForEach(l1, l2)`

**Pros and Cons of Each Approach:**

1. **Method 1 (m)**:
	* Pros: Custom implementation allows for fine-grained control over duplicate removal.
	* Cons: More complex logic, may be slower due to explicit checks.
2. **Method 2 (n)**:
	* Pros: Uses built-in JavaScript features (`Set`) and spread operator, which are efficient and concise.
	* Cons: May not be suitable for large arrays due to memory limitations.
3. **Method 3 (unique())**:
	* Pros: Simple and easy to understand implementation using array modification methods.
	* Cons: Modifies the original array, may not be suitable for all use cases.
4. **Method 4 (usingForEach)**:
	* Pros: Custom implementation allows for fine-grained control over duplicate removal.
	* Cons: More complex logic, slower due to explicit checks.

**Other Considerations:**

* Memory usage: Methods that create new arrays or objects may consume more memory than those that modify existing data structures.
* Performance: Methods with built-in JavaScript features tend to be faster due to optimization and caching.
* Code readability: Simple and concise implementations are often easier to understand and maintain.

**Alternatives:**

Other approaches for removing duplicates from two arrays include:

1. Using the `filter()` method in combination with a callback function.
2. Utilizing libraries like Lodash or Ramda, which provide optimized duplicate removal functions.
3. Implementing a custom sorting and filtering approach using array methods like `sort()`, `indexOf()`, and `splice()`.

Keep in mind that each approach has its trade-offs, and the best solution depends on specific requirements, performance constraints, and personal preference.

Related benchmarks:

Javascript array deducplication 2 (version: 0)

electric boogaloo

Comparing performance of: m vs n vs unique vs ForEACH

Created: 3 years ago by: Guest

Jump to the latest result

m

n

unique

ForEACH

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model llama3.2:3b, generated one year ago):