Benchmark: + '' vs .toString() v2 rand

Script Preparation code:

const randString = function () {
  return (Math.random() + 1).toString(36).substring(7);
};

const inputs = []
  .concat(Array.from({ length: 1000 }, () => randString()))
  .concat(Array.from({ length: 1000 }, () => Math.random()))
  .concat(
    Array.from({ length: 1000 }, () => ({
      a: Math.random(),
      b: randString(),
    }))
  )
  .concat(Array.from({ length: 1000 }, () => [Math.random(), randString()]));

function getRandomInput() {
  return inputs[Math.floor(Math.random() * inputs.length)];
}
function testToString(val) {
  return val.toString();
}
function testToStringCoercion(val) {
  return val + "";
}

Tests:

testToString
let nums = []; for(let i = 0; i < 100; ++i) { const val = getRandomInput() nums.push(testToString(val)); }
testToStringCoercion
let nums = []; for(let i = 0; i < 100; ++i) { const val = getRandomInput() nums.push(testToStringCoercion(val)); }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
testToString
testToStringCoercion

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark measures the performance difference between two approaches:

1. `toString()`: This method converts an object to a string using the `String()` function, which iterates over the object's properties and concatenates their strings.
2. `+ ''`: This operator attempts to convert a value to a string by adding a newline character (`''`).

**Options Compared**

The benchmark compares two options:

* `toString()`: Converts an object to a string using the `String()` function.
* `+ ''`: Attempts to convert a value to a string by concatenating it with a newline character.

**Pros and Cons of Each Approach**

1. `toString()`:
	* Pros: Can handle complex objects, provides more control over formatting, and is widely supported.
	* Cons: Can be slow for large objects or deep nesting.
2. `+ ''`:
	* Pros: Simple and fast, suitable for small objects or simple concatenation.
	* Cons: May not work correctly with all types of objects, can be error-prone if not used carefully.

**Library Usage**

In the benchmark code, no libraries are explicitly mentioned. However, it's essential to note that the `Array.from()` method is a modern JavaScript method introduced in ECMAScript 2015 (ES6). If you're targeting older browsers or environments, you might need to use alternative methods or polyfills.

**Special JS Feature/Syntax**

The benchmark uses the spread operator (`...`) and template literals (e.g., `const val = getRandomInput()`), which are part of modern JavaScript features. These features are widely supported in modern browsers, but older browsers might not execute them correctly.

**Other Alternatives**

If you want to avoid using `toString()` or `+ ''` for string conversion, you could consider using other methods:

* `JSON.stringify()`: Converts an object to a JSON string.
* `String.fromCharCode() + ...`: Creates a string by concatenating individual characters (e.g., `new Array(10).fill('a').join('')`).

Keep in mind that each of these alternatives has its own trade-offs and limitations.

I hope this explanation helps you understand the benchmark and make informed decisions about string conversion methods in your JavaScript projects!

Related benchmarks:

+ '' vs .toString() v2 rand (version: 0)

Comparing performance of: testToString vs testToStringCoercion

Created: 2 years ago by: Guest

Jump to the latest result

testToString

testToStringCoercion

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):