Overview

The provided benchmark measures the performance of three string search methods in JavaScript: startsWith, indexOf, and includes. These methods are commonly used to check if a substring is present within a larger string.

Benchmark Definition

The JSON data defines two test cases:

1. "Starts With"
2. "Index Of"
3. "Includes"

Each test case involves creating a string (a) with a sample Lorem ipsum text and then checking if another string (b) starts with, contains as an index, or includes the specified substring.

Options Compared

The benchmark compares three different string search methods:

1. startsWith: Returns true if the string b starts with the specified substring.
2. indexOf: Returns the index of the first occurrence of the specified substring in the string a. If the substring is not found, returns -1.
3. includes: Returns true if the string a includes the specified substring.

Pros and Cons

• startsWith:
  • Pros: More efficient than indexOf or includes, especially when searching for a specific prefix.
  • Cons: May not be as intuitive to use, as it requires careful consideration of edge cases (e.g., empty strings).
• indexOf:
  • Pros: Simple to use and understand, with minimal overhead. Suitable for most use cases where the search is not exact.
  • Cons: Can be slower than startsWith, especially when searching for a specific prefix or substring in a large string.
• includes:
  • Pros: More readable and intuitive than indexOf, with fewer edge cases to consider. Suitable for most use cases where the search is exact.
  • Cons: May be slower than startsWith due to the overhead of searching for the substring in the entire string.

Library Usage

None of the benchmark test cases explicitly use a JavaScript library. However, it's worth noting that some libraries (e.g., Lodash) provide optimized implementations of these methods.

Special JS Features or Syntax

There are no special JavaScript features or syntax used in this benchmark.

Other Alternatives

Other string search methods in JavaScript include:

• localeCompare: Compares two strings based on their locale and language settings.
• match: Returns an array of matches for a regular expression applied to the string.
• replace: Replaces occurrences of a specified pattern in the string with a new value.

Keep in mind that each of these methods has its own strengths, weaknesses, and use cases. This benchmark provides a concise way to compare the performance of three common string search methods: startsWith, indexOf, and includes.

If you're interested in exploring other options or learning more about the trade-offs between these methods, I can provide additional resources or guidance!