Benchmark: Js Search -Stri - MeasureThat.net

Tests:

Index Of
var a = 'hello#a#bc#helloa'; var b = a.indexOf('helloa') > -1;
Includes
var a = 'hello#a#bc#helloa'; var b = a.includes('helloa') > -1;

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Index Of
Includes

Fastest: N/A

Slowest: N/A

Latest run results:

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Autogenerated LLM Summary (model gemma2:9b, generated one year ago):

LLMs can make mistakes. Check important info.

This benchmark tests two different ways to search for a specific substring within a string in JavaScript.

**Options Compared:**

* **`indexOf()`**: This method returns the *first* index (position) of a given substring within a string. If the substring is not found, it returns -1.
* **`includes()`**: This method returns `true` if a given substring is found *anywhere* within the string, and `false` otherwise.

**Pros/Cons:**

* **`indexOf()`**:
    * **Pro**:  More precise; you get the exact position of the first occurrence.
    * **Con**: Less readable if you just need to know if the substring exists. If it's not found, it returns -1, which might require additional checks in your code.
* **`includes()`**:
    * **Pro**: More concise and readable for simply checking if a substring is present.  
    * **Con**: Doesn't give you the position of the substring. If you need that information, `indexOf()` is necessary.

**Other Considerations:**

* **Performance:** While both methods are generally efficient, `includes()` might be slightly faster in some cases because it doesn't need to return a specific index if the substring isn't found.  This benchmark highlights this difference.
    * Notice how much higher the execution speed is for "Index Of" compared to "Includes".

* **Use Case:** Choose the method that best suits your needs. If you only care about whether the substring exists, `includes()` is simpler and often faster. If you need to know the position of the substring, use `indexOf()`.

**Alternatives:**

While not directly comparable in this benchmark, other string searching methods exist:

* **`String.prototype.match()`**: This method uses regular expressions to find matches within a string. It's more powerful but can be slower for simple searches.
* **Libraries**: Specialized libraries like  "lodash" or "js-regex" offer optimized string manipulation functions, potentially offering performance gains over built-in methods.

Related benchmarks:

Js Search -Stri (version: 0)

Comparing performance of: Index Of vs Includes

Created: 3 years ago by: Guest

Jump to the latest result

Index Of

Includes

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

Autogenerated LLM Summary (model gemma2:9b, generated one year ago):