Benchmark: indexOf > -1 x indexOf != -1

Script Preparation code:

var a = [
  'height',
  'width',
  'maxHeight',
  'maxWidth',
  'maxHeight',
  'minWidth',
  'color',
  'bg',
  'backgroundColor',
  'opacity',
  'm',
  'mt',
  'mb',
  'mr',
  'mr',
  'mx',
  'my',
  'p',
  'pt',
  'pb',
  'pr',
  'pl',
  'px',
  'py',
  'border',
  'boxShadow',
  'flex',
  'verticalAlign',
  'textAlign',
  'overflow',
  'display',
  'cursor'
];
var b = new Set(a)

Tests:

indexof gte
return a.indexOf('mx') >= 0
indexof diff
return a.indexOf('mx') != -1

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexof gte
indexof diff

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

The provided JSON represents a benchmark test case created using MeasureThat.net. The test is designed to measure the performance of the `indexOf` method in JavaScript, which returns the index of the first occurrence of a specified value in an array.

**Test Cases**

There are two individual test cases:

1. **indexof gte**: This test case checks if the `indexOf` method returns a non-negative index when searching for the string `'mx'` in array `a`.
2. **indexof diff**: This test case is similar to the first one, but it also checks if the return value of `indexOf` is not equal to -1.

**Library and Purpose**

The `Set` object is used in both test cases. A `Set` in JavaScript is an unordered collection of unique values. In this benchmark, a new `Set` object named `b` is created from the array `a`. The purpose of using a `Set` here is to ensure that each value in the array is unique and can be used as a key for indexing.

**Special JS Feature/Syntax**

The only special syntax or feature used in this benchmark is the use of the `>=` operator, which performs a non-strict greater-than-or-equal comparison. This is not specific to any particular JavaScript implementation but rather a general mathematical operation.

**Approach Options**

There are two approaches compared in these test cases:

1. **strict equality check**: The first approach checks if the return value of `indexOf` is strictly equal to 0 (i.e., `-1`). This means that the method returns -1 when the specified value is not found.
2. **non-strict equality check**: The second approach checks if the return value of `indexOf` is not equal to -1, which allows for a non-negative index.

**Pros and Cons**

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

* **Strict Equality Check (indexof gte)**:
	+ Pros: More accurate results, as it checks for exact equality.
	+ Cons: May return incorrect results if the array contains duplicate values, which is not a concern in this specific test case.
* **Non-Strict Equality Check (indexof diff)**:
	+ Pros: Less restrictive, allowing for non-negative indices even when the specified value is not found. This can be beneficial in certain scenarios where a negative index would indicate an error.
	+ Cons: May return incorrect results if the array contains duplicate values or if the method returns -1.

**Other Alternatives**

If you were to rewrite this benchmark, you could consider adding additional test cases that explore other aspects of the `indexOf` method, such as:

* **Searching for a value at the beginning of the array**: This would involve checking if the return value is 0.
* **Searching for a value in an array with duplicates**: This would involve checking if the return value is not equal to -1 and also handles duplicate values correctly.

Overall, this benchmark provides a good starting point for measuring the performance of the `indexOf` method in JavaScript.

Related benchmarks:

indexOf > -1 x indexOf != -1 (version: 0)

Comparing performance of: indexof gte vs indexof diff

Created: 2 years ago by: Guest

Jump to the latest result

indexof gte

indexof diff

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):