Benchmark: if versus indexof

Script Preparation code:

x = undefined;
q1 =0;
q2 =0;

Tests:

IF
for( var i = 0; i< 100000 ; i++ ) { if ( x === undefined || x === "" || x === "FALSE" || x === "false" ) { q1=q1+1; } }
INDEXOF
for( var i = 0; i< 100000 ; i++ ) { if ( [undefined, "" , "FALSE", "false"].indexOf(x) !== -1 ) { q2=q2+1; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
IF
INDEXOF

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark compares the performance of two approaches: `if` statements with multiple conditions (`OR`) and the `indexOf()` method.

**What is being compared?**

In the first test case, "IF", a simple loop is executed 100,000 times. Inside the loop, a conditional statement checks if the variable `x` is either `undefined`, an empty string (`""`), or a string that can be converted to `false`. If any of these conditions are true, the value of `q1` is incremented.

In the second test case, "INDEXOF", another simple loop is executed 100,000 times. Inside the loop, the `indexOf()` method is called on an array containing the values `undefined`, an empty string (`""`), and a string that can be converted to `false`. The method returns the index of the first occurrence of `x` in the array. If `x` is not found, `-1` is returned.

**Options compared**

The benchmark compares the performance of these two approaches:

* `if` statements with multiple conditions (`OR`)
* The `indexOf()` method

**Pros and Cons:**

**IF Statements**

Pros:

* Simple to understand and implement
* Can be optimized using techniques like caching or memoization
* Allows for more control over the evaluation order and branch prediction

Cons:

* Can lead to slower performance due to the overhead of conditional statements and branching
* May not be as efficient as other methods, especially when dealing with large numbers of conditions

**IndexOf() Method**

Pros:

* Optimized by the browser's JavaScript engine for high-performance comparisons
* Avoids the overhead of conditional statements and branching
* Can take advantage of cache misses to reduce memory access patterns

Cons:

* May not be as intuitive or easy to understand, especially for developers without experience with array methods
* Can lead to slower performance if the search string is not found in the array

**Library Used:**

In the "INDEXOF" test case, the `indexOf()` method is used on an array. The purpose of this library is to provide a high-performance way to compare values against an array.

**Special JS Features/Syntax:**

There are no special JavaScript features or syntax mentioned in the benchmark definition that require specific understanding or expertise.

**Other Considerations:**

When running benchmarks like this, it's essential to consider factors such as:

* Garbage collection and memory allocation
* Cache behavior and page reloads
* Browser-specific optimizations and quirks

By controlling for these variables, developers can ensure accurate comparisons between different approaches.

**Alternatives:**

If the `indexOf()` method is not suitable or is missing in a particular browser or environment, alternative methods like:

* String.prototype.indexOf() (in older browsers)
* Array.prototype.indexOf.call() (in some environments)
* Regular expressions (.test()) could be used instead.

However, these alternatives might incur additional performance overhead or limitations.

Latest run results:

Run details: (Test run date: 2025 years ago)

User agent: Mozilla/5.0 (Windows NT 6.1; WOW64; Trident/7.0; rv:11.0) like Gecko

Browser/OS: IE 11 on Windows 7

View result in a separate tab

Test name	Executions per second
IF	30.7 Ops/sec
INDEXOF	24.6 Ops/sec

Related benchmarks:

if versus indexof (version: 0)

Check if with multiple condition "OR" is fastest that indexOf

Comparing performance of: IF vs INDEXOF

Created: 6 years ago by: Guest

Jump to the latest result

IF

INDEXOF

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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