var arr = [10];
for (let i = 0; i < 10; i++){
arr.unshift(i);
}
for (let i = 0; i < 10; i++){
arr.push(i);
}
arr.reverse();
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
unshift | |
push + reverse |
Test name | Executions per second |
---|---|
unshift | 5331.7 Ops/sec |
push + reverse | 2970.0 Ops/sec |
Let's break down the provided benchmark and explain what's being tested, compared, and their pros and cons.
Benchmark Overview
The benchmark is comparing two approaches to add an element to an array:
unshift
: Adding an element to the beginning of the array using the unshift
method.push + reverse
: Adding an element to the end of the array using the push
method, followed by reversing the entire array.Library Used
The benchmark doesn't explicitly mention any libraries being used beyond JavaScript's built-in functionality. However, it's likely that the browser's implementation of JavaScript is using a specific library or engine that might affect the results.
Special JS Features or Syntax
There are no special JavaScript features or syntaxes mentioned in this benchmark. The focus is on comparing two common array manipulation techniques.
Options Compared
The benchmark is comparing the performance of:
unshift
: Adding an element to the beginning of the array.push + reverse
: Adding an element to the end of the array and then reversing the entire array.Pros and Cons of Each Approach
unshift
:push + reverse
:unshift
because of the additional step of reversing the entire array.Other Considerations
push + reverse
.let i = 0;
for looping instead of traditional for
loops might add additional overhead due to the need to create and initialize local scope variables.Alternatives
If you wanted to explore other array manipulation techniques, here are a few alternatives:
splice
: Removing and replacing elements at specific indices.concat
: Adding one or more arrays together using concatenation.slice
with push
(or vice versa): Using slice
to create a new array from a subset of the original array, then pushing the elements onto the end.These alternatives might offer different performance characteristics depending on the specific use case and array size.