var myArray = [27, 11, 46, 64, 62, 42, 5, 9];
Math.max(myArray);
myArray.reduce((a, b) => Math.max(a, b))
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Spread operator | |
Array.prototype.reduce() |
Test name | Executions per second |
---|---|
Spread operator | 1442566.1 Ops/sec |
Array.prototype.reduce() | 566589.4 Ops/sec |
The provided JSON represents a JavaScript microbenchmark on MeasureThat.net. The benchmark tests two approaches for finding the maximum value in an array: the spread operator and Array.prototype.reduce().
Test Case 1: Spread Operator
The test case uses the following code:
Math.max(...myArray);
This line of code uses the spread operator (...
) to pass all elements of the myArray
array as separate arguments to the Math.max()
function. This approach is a concise and readable way to find the maximum value in an array.
Pros:
Cons:
Test Case 2: Array.prototype.reduce()
The test case uses the following code:
myArray.reduce((a, b) => Math.max(a, b));
This line of code uses the reduce()
method to iterate over the elements of the myArray
array and find the maximum value. The callback function (a, b) => Math.max(a, b)
is called for each pair of elements in the array, where a
and b
are consecutive elements.
Pros:
Cons:
reduce()
method's behaviorLibrary and Special JS Feature
Neither of these test cases uses any libraries or special JavaScript features. The spread operator is a built-in feature introduced in ES6, while Array.prototype.reduce() is also a built-in method.
Other Alternatives
There are other approaches to finding the maximum value in an array, such as:
Math.max.apply(null, myArray)
(which is similar to the spread operator but uses the apply()
method instead)myArray[0]
and iterating over the rest of the array using a for loopfor...of
loops to iterate over the elements of the arrayHowever, these alternatives are generally less efficient or more verbose than the Array.prototype.reduce() approach.
Benchmark Results
The benchmark results show that the spread operator is slower than Array.prototype.reduce() in this particular test case. The spread operator executes at an average rate of 566 executions per second, while Array.prototype.reduce() executes at an average rate of 1,444,566 executions per second. This suggests that for large datasets, Array.prototype.reduce() may be a more efficient approach.