Benchmark: Replace string methods, .replace(), replaceAll(), and split+join

Script Preparation code:

var strOut = '';
var strIn = 'This is just a test';
var just = 'just';

Tests:

Replace
strOut = strIn.replace('just', '');
Replace All
strOut = strIn.replaceAll('just', '');
Split+Join
strOut = strIn.split('just').join('');
Replace from var
strOut = strIn.replace(just, '');
Replace all from var
strOut = strIn.replaceAll(just, '');
Split+join from var
strOut = strIn.split(just).join('');
Replace with template literal
strOut = strIn.replace(`${just}`, '');
Split+join with template literal
strOut = strIn.split(`${just}`).join('');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Replace
Replace All
Split+Join
Replace from var
Replace all from var
Split+join from var
Replace with template literal
Split+join with template literal

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

This benchmark does not have any results yet. Be the first one to run it!

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

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the JavaScript benchmark test case provided by MeasureThat.net.

**Overview**

The benchmark tests four different approaches for replacing or removing substrings from a string in JavaScript:

1. `replace()`
2. `replaceAll()`
3. `split()` + `join()`
4. Using template literals with `${}`

Each approach is tested multiple times on various browsers, devices, and operating systems.

**Approaches Compared**

Here's a brief explanation of each approach:

### 1. `replace()`

The most traditional way to replace a substring in JavaScript. It takes two arguments: the substring to be replaced and the replacement string.

Pros: Simple, widely supported, and well-documented.
Cons: Can be slow for large strings or complex patterns.

Example:
```javascript
strOut = strIn.replace('just', '');
```

### 2. `replaceAll()`

An alias of `replace()` with multiple arguments. It's used to replace all occurrences of a substring with another string.

Pros: Similar to `replace()`, but with more flexibility.
Cons: Still relatively slow for large strings or complex patterns.

Example:
```javascript
strOut = strIn.replaceAll('just', '');
```

### 3. `split()` + `join()`

A clever approach that splits the input string into an array of substrings using the separator, and then joins them back together without the separator.

Pros: Can be faster than traditional approaches for large strings or complex patterns.
Cons: Requires creating an intermediate array, which can consume more memory.

Example:
```javascript
strOut = strIn.split('just').join('');
```

### 4. Using template literals with `${}`

A modern approach that uses template literals to insert variables into a string. It's similar to `replace()`, but with the added benefit of being more readable and efficient.

Pros: Fast, readable, and efficient.
Cons: Requires support for template literals in JavaScript engines.

Example:
```javascript
strOut = strIn.replace(`${just}`, '');
```

**Library Used**

None of the approaches use any external libraries. They're all built-in to JavaScript.

**Special JS Features/Syntax**

The benchmark uses modern JavaScript features, such as:

* Template literals (`${}`) in approach 4.
* `replaceAll()` (an alias of `replace()`) in approaches 1 and 2.
* Array methods like `split()` and `join()` in approach 3.

Note that the benchmark does not use any special JS features or syntax beyond what's mentioned above. If you'd like me to elaborate on any specific aspect, feel free to ask!

Related benchmarks:

Replace string methods, .replace(), replaceAll(), and split+join (version: 0)

Comparing performance of: Replace vs Replace All vs Split+Join vs Replace from var vs Replace all from var vs Split+join from var vs Replace with template literal vs Split+join with template literal

Created: 3 years ago by: Guest

Jump to the latest result

Replace

Replace All

Split+Join

Replace from var

Replace all from var

Split+join from var

Replace with template literal

Split+join with template literal

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):