var arr = [ 1, 2, 3 ];
arr.map(a => (
a === 0 ||
a === 2
));
arr.map(a => [0, 2].includes(a));
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
compare | |
includes |
Test name | Executions per second |
---|---|
compare | 5680058.5 Ops/sec |
includes | 4435589.5 Ops/sec |
I'd be happy to explain the provided benchmark and its different aspects.
Benchmark Overview
The given benchmark is focused on comparing two approaches: using arr.includes()
(which checks if an element exists in an array) versus a custom implementation of includes using logical operators (===
or !==
). The purpose of this benchmark is to measure which approach performs better, likely in terms of speed and/or memory usage.
Options Compared
The two options being compared are:
arr.includes()
: This method checks if an element exists in the array by iterating through its elements and verifying if it finds a match.===
or !==
): This implementation manually checks for membership in the array, using logical operators to compare each element with the target value.Pros and Cons of Each Approach
arr.includes()
:===
or !==
):Library Used
There isn't a library explicitly mentioned in the provided benchmark definition. However, arr.includes()
is a built-in JavaScript method that's part of the ECMAScript standard.
Special JS Feature or Syntax
The custom implementation uses arrow functions (=>
) and template literals (\r\n ... \r\n
), which are supported by most modern browsers. The use of \r\n
for line breaks might be specific to certain platforms, but it's unlikely to affect the benchmarking results.
Other Considerations
arr.includes()
.Other Alternatives
Alternative methods for array membership checking include:
Array.prototype.findIndex()
: Returns the index of the first element that satisfies the condition, or -1 if no match is found.Array.prototype.indexOf()
: Returns the index of the first occurrence of a specified value, or -1 if not found.Keep in mind that these methods might have different performance characteristics and are more suitable for specific use cases.