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Array concat vs spread operator vs push vs push apply
(version: 0)
Compare the new ES6 spread operator with the traditional concat() method and push
Comparing performance of:
Array.prototype.concat vs spread operator vs Push vs Push w/apply
Created:
2 years ago
by:
Guest
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Tests:
Array.prototype.concat
var params = [5 , 8, 9 ]; var other = [ 1, 2 ].concat(params);
spread operator
var params = [5 , 8, 9 ]; var other = [ 1, 2, ...params ]
Push
var params = [5 , 8, 9 ]; var other = [ 1, 2 ].push(...params);
Push w/apply
var params = [5 , 8, 9 ]; var ar = [ 1, 2 ] var other = ar.push.apply(ar, params);
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Suite status:
<idle, ready to run>
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Test case name
Result
Array.prototype.concat
spread operator
Push
Push w/apply
Fastest:
N/A
Slowest:
N/A
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Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**Overview** MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark definition JSON and test case describe four different methods for concatenating or merging arrays: the traditional `concat()` method, the new ES6 spread operator (`...`), `push`, and `push.apply`. We will analyze each method, its pros and cons, and consider alternative approaches. **Benchmark Definition** The benchmark definition states that we want to compare: * `Array.prototype.concat` * The new ES6 spread operator (`...`) * `push` * `push.apply` **Methods and their Pros/Cons:** ### 1. `Array.prototype.concat` * **Method:** `concat([array1], [array2])` merges two arrays into a single array. * **Pros:** Well-established, widely supported, and easy to use. * **Cons:** Can be slow for large arrays due to the overhead of creating a new array object. ### 2. New ES6 Spread Operator (`...`) * **Method:** `var arr = [1, 2]; var other = [...arr, 3, 4];` * **Pros:** Fast, concise, and efficient. * **Cons:** Requires JavaScript engine support for the spread operator (not all browsers or environments). ### 3. `push` * **Method:** `array.push(element)` adds an element to the end of an array. * **Pros:** Fast, as it only modifies the existing array object. * **Cons:** Can lead to inefficient stack operations if the array is large and pushed multiple times. ### 4. `push.apply` * **Method:** `Array.prototype.push.apply(arr, [element1], [element2])` applies an array of elements to a target array using `push`. * **Pros:** Similar performance benefits as `push`, but with more flexibility. * **Cons:** Less readable than the other methods and may be less supported by older browsers. **Library and Purpose** None of these methods rely on external libraries. However, if we were to use libraries like Lodash or Ramda for array manipulation, they might provide additional benefits or optimizations. **Special JS Feature/Syntax: ES6 Spread Operator** The new ES6 spread operator (`...`) is a concise way to merge arrays. It was introduced in ECMAScript 2015 and has become widely adopted since then. Its performance benefits come from the fact that it avoids creating a new array object, instead modifying the existing one. **Alternative Approaches** Other methods for merging or concatenating arrays include: * Using `Array.prototype.reduce()` with an initial value. * Creating a new array using the spread operator (`[...array1, ...array2]`) and then assigning it to a variable. * Using `Array.prototype.concat()` followed by assignment. These alternatives may offer different performance benefits or trade-offs in terms of readability. However, they are generally less efficient than the methods described above. **Conclusion** Each method has its strengths and weaknesses. The choice between them ultimately depends on your specific use case, performance requirements, and personal preference. MeasureThat.net provides a useful platform for comparing these methods and determining their relative performance on different hardware configurations.
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