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indexOf > -1 x indexOf != -1
(version: 0)
Comparing performance of:
indexof gte vs indexof diff
Created:
2 years ago
by:
Guest
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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>
Run tests (2)
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Test case name
Result
indexof gte
indexof diff
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 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.
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