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Array.prototype.concat vs spread operator for joining arrays
(version: 0)
Comparing ES6 spread against concat for joining two complex arrays.
Comparing performance of:
ES6 Spread Operator vs Array.prototype.concat
Created:
5 years ago
by:
Guest
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Tests:
ES6 Spread Operator
const foo = [ {a: 'b', c: 'd'}, {a: 'b', c: 'd'}, ]; const bar = [ {a: 'b', c: 'd'}, {a: 'b', c: 'd'}, ]; const baz = [...foo, ...bar];
Array.prototype.concat
const foo = [ {a: 'b', c: 'd'}, {a: 'b', c: 'd'}, ]; const bar = [ {a: 'b', c: 'd'}, {a: 'b', c: 'd'}, ]; const baz = foo.concat(bar);
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Suite status:
<idle, ready to run>
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Test case name
Result
ES6 Spread Operator
Array.prototype.concat
Fastest:
N/A
Slowest:
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the explanation of the provided benchmark. **Benchmark Overview** The benchmark compares two approaches for joining two complex arrays: the ES6 spread operator (`...`) and `Array.prototype.concat()`. The test case is designed to measure the performance difference between these two methods on a large dataset. **Options Compared** Two options are compared: 1. **ES6 Spread Operator**: This approach uses the spread operator (`...`) to concatenate two arrays. 2. **`Array.prototype.concat()`**: This approach uses the `concat()` method of the Array prototype to concatenate two arrays. **Pros and Cons of Each Approach** * **ES6 Spread Operator**: + Pros: Efficient, concise, and easy to read. + Cons: May not be supported in older browsers or environments. + Additional note: The spread operator is a relatively new feature introduced in ES6. It's a powerful tool for array manipulation. * **`Array.prototype.concat()`**: + Pros: Widely supported across modern browsers and environments, including older versions. + Cons: Less concise and less readable than the spread operator. **Library Used** There is no explicit library used in this benchmark. The ES6 spread operator is a built-in feature of JavaScript, and `Array.prototype.concat()` is also a built-in method. **Special JS Feature or Syntax** The benchmark uses the ES6 spread operator, which introduces a new syntax for array manipulation. This syntax was introduced in ES2015 (also known as ECMAScript 6) and has become a standard feature of modern JavaScript. **Other Alternatives** If you're interested in exploring alternative approaches, here are a few options: 1. **Using `Array.prototype.push()`**: You could use the `push()` method to concatenate two arrays by pushing each element from one array into another. 2. **Using `Array.prototype.reduce()`**: You could use the `reduce()` method to concatenate two arrays by reducing an accumulator array and adding elements from both input arrays. Keep in mind that these alternatives may have different performance characteristics and trade-offs compared to the ES6 spread operator or `Array.prototype.concat()`.
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