Benchmark: indexOf vs match

Script Preparation code:

var brand = "ted baker";
var isTedBaker;

Tests:

indexOf
isTedBaker = brand.indexOf("ted baker") !== -1;
match
isTedBaker = brand.match(/ted\s+baker/i)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
indexOf
match

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 break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare two approaches: `indexOf` and `match`. Both methods are used to check if a string contains a specific substring.

**Options Compared**

There are two options being compared:

1. **`indexOf`**: This method returns the index of the first occurrence of the specified substring in the original string. If the substring is not found, it returns -1.
2. **`match`**: This method returns an array containing all matches if the regular expression pattern is found anywhere in the string. The `i` flag at the end of the regex pattern makes the match case-insensitive.

**Pros and Cons**

* `indexOf`:
	+ Pros: Generally faster than `match`, as it doesn't require creating a regex object or compiling a pattern.
	+ Cons: Returns only the index of the first occurrence, which might not be what you want if you need to check for multiple occurrences or perform operations on the entire string.
* `match`:
	+ Pros: Can be more convenient when working with regular expressions, as it returns all matches, and can be used for more complex pattern matching.
	+ Cons: Generally slower than `indexOf`, especially for simple substring searches.

**Library/Utility Used**

In this benchmark, the `match()` function is used in combination with a regex pattern. The regex pattern `/ted\\s+baker/i` breaks down as follows:

* `^`: Matches the start of the string.
* `ted`: Matches the literal substring "ted".
* `\s+`: Matches one or more whitespace characters (spaces, tabs, etc.).
* `baker`: Matches the literal substring "baker".
* `$`: Matches the end of the string.
* `i`: Makes the match case-insensitive.

**Special JS Feature/Syntax**

In this benchmark, the use of the `\s+` regex pattern is worth noting. This is a special syntax in JavaScript that matches one or more whitespace characters. It's not specific to any particular browser or version, but rather part of the standard JavaScript regular expression API.

**Other Alternatives**

If you needed to compare these two approaches for different reasons, some alternative methods could be:

* Using `includes()` instead of `indexOf` (which is a modern method introduced in ES2019). `includes()` would return a boolean indicating whether the string contains the specified substring.
* Using `replace()` or `split()` instead of `match`. These methods can be used to perform more complex operations on the string, but might not be as efficient for simple substring searches.

Keep in mind that the best approach depends on your specific use case and requirements.

Related benchmarks:

indexOf vs match (version: 0)

Comparing performance of: indexOf vs match

Created: 9 years ago by: Guest

Jump to the latest result

indexOf

match

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):