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concast test
(version: 0)
Comparing performance of:
concat vs array join vs array concat
Created:
2 years ago
by:
Guest
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Tests:
concat
var text = ''; for (i = 10000; i > 0; i--) { text += ` some text`; }
array join
var text = []; for (i = 10000; i > 0; i--) { text.push('some text'); } var val = text.join(" ");
array concat
let text = []; for (i = 10000; i > 0; i--) { text[i] = "some text"; } const val = text.join(" ");
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Suite status:
<idle, ready to run>
Run tests (3)
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Test case name
Result
concat
array join
array concat
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the world of JavaScript microbenchmarks! **What is being tested?** The provided JSON represents three individual test cases: 1. **Concatenation**: The benchmark tests the performance of concatenating strings using the `+` operator. 2. **Array Join**: The benchmark tests the performance of joining an array of strings using the `join()` method. 3. **Array Concatenation**: The benchmark tests the performance of concatenating elements in an array using a loop. **Options compared** The three benchmarks compare different approaches to achieve the same result: * Concatenation: Using the `+` operator to concatenate strings. * Array Join: Using the `join()` method on an array of strings. * Array Concatenation: Using a loop to push elements into an array and then joining them using `join()`. **Pros and Cons** Here's a brief summary of each approach: * **Concatenation**: This is a simple and straightforward way to concatenate strings. However, it can be slow because the JavaScript engine has to create new strings on each iteration. * **Array Join**: This method is generally faster than concatenation because it avoids creating intermediate strings. However, it requires an array of strings as input, which may not be as convenient as a simple string concatenation. * **Array Concatenation**: This approach can be slower than Array Join because it involves a loop and multiple push operations into the array. **Libraries and special JS features** None of the benchmarks use any external libraries. However, they do employ some JavaScript language features: * **For loop with decrementing index**: All three benchmarks use a for loop with a decrementing index to iterate from 10000 down to 1. * **String concatenation using `+`**: The Concatenation benchmark uses the `+` operator to concatenate strings. **Other alternatives** If you want to explore other approaches, here are some possible alternatives: * Using `template literals`: Instead of concatenating strings using the `+` operator, you could use template literals (e.g., `${text}`) to create a new string. This approach is faster than concatenation but slower than Array Join. * Using `String.prototype.repeat()`: If you're running in a modern JavaScript environment, you could use `String.prototype.repeat()` to concatenate strings. This method is generally faster than concatenation and Array Join. Keep in mind that these alternatives may not be relevant for every specific use case or performance optimization goal.
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