var array = []
var object1 = {}
var object2 = {}
for(var i = 0; i < 1e6; i++) {
var v = Math.random()
array[i] = v
object1[i] = v
object2[`v${i}`] = v
}
var sum = 0
for(var i = 1e6 - 1; i >= 0; i--) {
sum += array[i]
}
sum
var sum = 0
for(var i = 1e6 - 1; i >= 0; i--) {
sum += object1[i]
}
sum
var sum = 0
for(var i = 1e6 - 1; i >= 0; i--) {
sum += object2[`v${i}`]
}
sum
var sum = 0
for(var i = 1e6 - 1; i >= 0; i--) {
sum += object2['v' + i]
}
sum
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
array | |
object | |
object with text field | |
object with concat |
Test name | Executions per second |
---|---|
array | 9.8 Ops/sec |
object | 8.2 Ops/sec |
object with text field | 1.5 Ops/sec |
object with concat | 1.6 Ops/sec |
Let's break down the provided JSON and explain what's being tested.
Benchmark Definition
The benchmark definition provides the script preparation code for each test case. In this case, we have four test cases:
var array = []
. The script then iterates over the array to calculate the sum of its elements.object1
and another named object2
are created, each with a single property (i
) that increments from 0 to 999999 (1 million - 1). The script then iterates over both objects to calculate the sum of their properties.'v' + i
).concat()
method to concatenate strings when accessing the property.Options Compared
The four test cases compare different approaches for accessing elements in an object:
array[i]
) to access elements.object1[i]
or object2['v' + i]
) to access properties.'v' + i
) when accessing properties.Pros and Cons of Each Approach
Here's a brief summary:
Library and Purpose
There is no library explicitly mentioned in the benchmark definition. However, some libraries may be used indirectly by the browser or the operating system (e.g., Math.random()
).
Special JS Feature or Syntax
The provided benchmark definition does not include any special JavaScript features or syntax that would require specific treatment.
Other Alternatives
If you were to modify the benchmark to explore different approaches, some alternatives could be:
Map
instead of an object).number
) vs. objects with properties.Please note that these alternatives would require significant changes to the benchmark definition and script preparation code, which might not be feasible within the provided constraints.