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push vs set length and index vs index vs typedArray to array vs typedArray
(version: 0)
Comparing performance of:
push vs set length and index vs index vs typedArray to js array vs typedArray
Created:
2 years ago
by:
Guest
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Tests:
push
const arr = [] const length = 100000 for(let i = 0; i < length; i++) { arr.push(i, 1) } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
set length and index
const arr = [] const length = 100000 arr.length = length*2+1 for(let i = 0; i < length; i++) { arr[i*2] = i; arr[i*2+1] = 1; } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
index
const arr = [] const length = 100000 for(let i = 0; i < length; i++) { arr[i*2] = i; arr[i*2+1] = 1; } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
typedArray to js array
const typedArray = new Int8Array(20001); const length = 100000 for(let i = 0; i < length; i++) { typedArray[i*2] = i; typedArray[i*2+1] = 1; } const arr = Array.from(typedArray); console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
typedArray
const arr = new Int8Array(20001); const length = 100000 for(let i = 0; i < length; i++) { arr[i*2] = i; arr[i*2+1] = 1; } console.log(arr[0], arr[100], arr[1000], arr[10001], arr[20000])
Rendered benchmark preparation results:
Suite status:
<idle, ready to run>
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Test case name
Result
push
set length and index
index
typedArray to js array
typedArray
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 explanation of the provided benchmark. **What is being tested?** The benchmark tests four different approaches to populate an array with values and then access those values: 1. **Push**: Using the `push()` method to add elements to the end of the array. 2. **Set length and index**: Setting the length property of the array and accessing elements by their index directly. 3. **Index**: Similar to the previous approach, but without setting the length explicitly. 4. **TypedArray to JavaScript array**: Converting a TypedArray (a binary data type) to a regular JavaScript array using `Array.from()`. **Options compared** The benchmark compares the performance of these four approaches: * Push vs Set length and index * Index vs TypedArray to JavaScript array **Pros and cons of each approach:** 1. **Push**: * Pros: Simple, efficient, and widely supported. * Cons: Can be slower for large arrays due to the overhead of pushing elements individually. 2. **Set length and index**: * Pros: Can be faster than push for large arrays since it avoids the overhead of individual element pushes. * Cons: Requires setting the length property explicitly, which can be error-prone and may not work as expected if the array is modified later. 3. **Index**: * Pros: Similar to Set length and index, but without the need to set the length property explicitly. * Cons: May still incur overhead due to individual element accesses. 4. **TypedArray to JavaScript array**: * Pros: Can be faster than push and Set length and index since it uses a more efficient data structure (TypedArray). * Cons: Requires converting the TypedArray to a regular JavaScript array using `Array.from()`, which can incur additional overhead. **Library used** In this benchmark, no specific library is mentioned. However, the use of `Int8Array` suggests that the benchmark is written for performance-critical code and may be targeting modern browser implementations. **Special JS feature or syntax** The benchmark uses a few features that are not commonly encountered in everyday JavaScript development: * The `for...of` loop (not explicitly used here, but implied by the use of `push()` and indexing) is not explicitly mentioned. * The use of `Array.from()` to convert a TypedArray to a regular JavaScript array. **Other alternatives** Some alternative approaches that are not tested in this benchmark include: * Using `splice()` to insert elements at specific indices. * Using a library like Lodash or Ramda for array manipulation. * Using a different data structure, such as an object or a Map, instead of an array.
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