Benchmark: indexOf vs map iterator

Script Preparation code:

var array = [];
for (var i = 0; i < 300; ++i) {
    array.push('00' + i);
}

function hasWithIndexOf(needle) {
    return array.indexOf(needle) !== -1;
}

var map = {};
array.forEach(item => map[item] = true);

function hasWithMap(needle) {
    array.map(item => {
        if (item === needle) {
            return true;
        }
        return false;
    })
}

Tests:

indexOf
for (var i=0; i<100; ++i) { hasWithIndexOf('404'); }
map
for (var i=0; i<100; ++i) { hasWithMap('404'); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
map

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 benchmark and its components.

**Benchmark Overview**

The benchmark compares the performance of two approaches: using `indexOf` (a built-in method) versus using a map iterator to achieve the same result.

**Script Preparation Code**

The script preparation code generates an array of 300 strings, each representing a number in the format "00nnn" where n is an integer from 0 to 299. This array will be used as the input data for both test cases.

Two functions are defined:

1. `hasWithIndexOf(needle)`: This function uses the `indexOf` method to check if a given string (`needle`) exists in the array.
2. `hasWithMap(needle)`: This function creates a map (an object in JavaScript) and iterates over the array using `forEach`, adding each element as a key with a value of `true`. It then uses another function (not shown in this code snippet) to check if the given string (`needle`) exists in the map.

**Test Cases**

There are two test cases:

1. **indexOf**: This test case runs the `hasWithIndexOf` function 100 times with the input "404".
2. **map**: This test case runs the modified version of the `hasWithMap` function (not shown) 100 times with the input "404".

**Library and Features**

In this benchmark, two libraries are used:

1. **Array.prototype.indexOf()**: A built-in method in JavaScript that returns the index of a specified element in an array.
2. **Array.prototype.forEach()**: A built-in method in JavaScript that executes a provided function once for each element in an array.

No special JavaScript features or syntax are used in this benchmark.

**Pros and Cons**

Here's a brief analysis of the pros and cons of each approach:

1. **indexOf**:
	* Pros: Native implementation, usually faster.
	* Cons: May not be as efficient if the input string is large, as it may require a linear search.
2. **Map iterator**:
	* Pros: Can be more efficient for larger inputs, as it uses a hash table to store the elements.
	* Cons: Requires creating an additional object (the map), which can incur overhead.

**Other Alternatives**

Alternative approaches could include:

1. Using `Array.prototype.includes()` instead of `indexOf()`, as it is a modern alternative with similar performance characteristics.
2. Using other search algorithms, such as binary search or interpolation search, which may be more efficient for certain use cases.
3. Using a custom implementation that avoids the overhead of built-in methods and uses native operations instead.

Keep in mind that these alternatives may not offer significant performance improvements over the current benchmark setup, but they could provide alternative approaches to explore if needed.

Related benchmarks:

indexOf vs map iterator (version: 0)

Comparing performance of: indexOf vs map

Created: 2 years ago by: Guest

Jump to the latest result

indexOf

map

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):