Benchmark: empty string 3 - MeasureThat.net

Tests:

not string
function isEmpty(string) { return !string; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);
length is 0
function isEmpty(string) { return string.length === 0; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);
not length
function isEmpty(string) { return !string.length; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);
string equals empty string
function isEmpty(string) { return string.length > 0; } const text = 'This is an example of a non empty string'; const empty = ''; const test1 = isEmpty(text); const test2 = isEmpty(empty);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
not string
length is 0
not length
string equals empty string

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/124.0.0.0 Safari/537.36

Browser/OS: Chrome 124 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
not string	176279360.0 Ops/sec
length is 0	171709408.0 Ops/sec
not length	160182704.0 Ops/sec
string equals empty string	157284720.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Measuring the performance of different approaches to check if a string is empty is a valuable benchmarking exercise, especially in JavaScript. Let's dive into the details.

**Benchmark Definition**
The benchmark is defined by a JSON object that specifies four test cases:

1. `not string`: This test case checks if the input `string` is not a string.
2. `length is 0`: This test case checks if the length of the input `string` is 0.
3. `not length`: This test case checks if the length property of the input `string` is not a number (i.e., it's not a valid length check).
4. `string equals empty string`: This test case checks if the input `string` is equal to an empty string.

**Options Compared**
The benchmark compares four different approaches to check if a string is empty:

1. Using the `!` operator: `return !string;`
2. Checking the length of the string using the `length` property: `return string.length === 0;`
3. Using the `!` operator on the length property: `return !string.length;`
4. Checking if the length is greater than 0: `return string.length > 0;`

**Pros and Cons**

1. **Using the `!` operator**: This approach is simple and straightforward. However, it may be slower than other approaches because it involves a potentially expensive coercion operation.
2. **Checking the length of the string using the `length` property**: This approach is more efficient than the first one because it avoids the coercion operation. However, it may not work as expected if the input `string` has some special properties (e.g., `NaN`, `undefined`, or an object with a `length` property).
3. **Using the `!` operator on the length property**: This approach is similar to the first one but avoids the coercion operation altogether.
4. **Checking if the length is greater than 0**: This approach is actually checking for the opposite of what's expected, which means it will return `true` for non-empty strings and `false` for empty strings.

**Library and Special Features**
There are no libraries or special JavaScript features used in this benchmarking exercise.

**Other Considerations**

* The benchmark assumes that the input `string` is a primitive value (i.e., not an object with a `length` property).
* The benchmark doesn't account for edge cases like `NaN` or `undefined` inputs.
* The benchmark only measures the performance of these four approaches and doesn't consider other factors like memory usage or cache effects.

**Alternatives**
If you're interested in exploring alternative approaches to check if a string is empty, here are a few options:

1. Use the `toString()` method: `return string.toString().length === 0;`
2. Use a regular expression: `return !/^\s*$/g.test(string);`
3. Use a custom implementation using bitwise operations: `return (string.charCodeAt(0) ^ 0x00) !== 0;`

Keep in mind that these alternatives may have different performance characteristics and edge cases to consider.

In conclusion, this benchmark helps us understand the performance differences between four common approaches to check if a string is empty in JavaScript. By analyzing the results, we can make informed decisions about which approach to use in our own codebases.

Related benchmarks:

empty string 3 (version: 0)

Different ways of checking if string is empty

Comparing performance of: not string vs length is 0 vs not length vs string equals empty string

Created: one year ago by: Guest

Jump to the latest result

not string

length is 0

not length

string equals empty string

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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