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JS: Array.prototype.concat vs spread operator
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method
Comparing performance of:
Array.prototype.concat vs spread operator
Created:
6 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [ "hello", true, 7 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [ "hello", true, 7 ] var other = [ 1, 2, ...params ]
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Result
Array.prototype.concat
spread operator
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
Let's dive into the benchmark. **Benchmark Description** The benchmark compares two ways to concatenate arrays in JavaScript: the traditional `Array.prototype.concat()` method and the new ES6 spread operator (`...`). **Options Compared** The benchmark tests two options: 1. **Array.prototype.concat()**: This method concatenates two or more arrays and returns a new array containing all elements from both arrays. 2. **Spread Operator (new ES6 syntax)**: This operator allows you to expand an array into individual arguments, effectively creating a new array. **Pros and Cons of Each Approach** * `Array.prototype.concat()`: + Pros: well-established method, easy to understand and implement. + Cons: may be slower than the spread operator due to the overhead of calling a function on the `Array.prototype`. * Spread Operator (`...`): + Pros: more concise and expressive way to concatenate arrays, potentially faster execution. + Cons: relatively new syntax, may not be immediately familiar to all developers. **Library Used** There is no specific library used in this benchmark. However, it's worth noting that the spread operator relies on the `Object.assign()` method, which is a part of the JavaScript standard library. **Special JS Feature or Syntax** The spread operator (`...`) was introduced in ECMAScript 2015 (ES6) and has since become a widely adopted feature. It allows you to "spread out" an array into individual arguments when calling a function that expects multiple arguments. **Other Considerations** When choosing between `Array.prototype.concat()` and the spread operator, consider the following: * Performance: If speed is critical, the spread operator may be slightly faster due to its concise syntax and potential for inlining. * Readability: The spread operator can make code more readable when concatenating arrays, but may require additional context for less familiar developers. **Alternatives** Other alternatives for array concatenation include: * `Array.prototype.push()`: Adding elements to the end of an array using `push()` and then indexing into the resulting array. * Using a temporary variable: Creating a new array by assigning individual elements from one or more arrays to a temporary variable, then reassigning that variable's contents back to the desired array. However, these alternatives are generally less concise and may be slower than the spread operator.
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