var n = 0;
while(true) {
n++;
if(n==100000)
break;
}
var n = 0;
while(true) {
n++;
if(n===100000)
break;
}
var n = 0;
while(true) {
n++;
if(n=='100000')
break;
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
test equality | |
test strict equality | |
string to int |
Test name | Executions per second |
---|---|
test equality | 6300.4 Ops/sec |
test strict equality | 6294.4 Ops/sec |
string to int | 881.4 Ops/sec |
Let's break down the benchmark test cases and results.
Benchmark Definition
The benchmark is called "Which equals operator (== vs ===) is faster?" and its purpose is to compare the performance of two different equality operators in JavaScript: ==
(loose equality) and ===
(strict equality).
Test Cases
There are three test cases:
==
to check if a variable n
equals 100,000.var n = 0;
while(true) {
n++;
if(n == 100000)
break;
}
===
to check if a variable n
equals 100,000.var n = 0;
while(true) {
n++;
if(n === 100000)
break;
}
'100000'
to an integer and then compare it with the variable n
. However, this is not a valid equality comparison and will likely throw an error.var n = 0;
while(true) {
n++;
if(n == '100000')
break;
}
Library/Feature
None of the test cases use any external libraries or special JavaScript features.
Comparison Options
The benchmark compares three different equality operators:
==
(loose equality)===
(strict equality)==
Pros/Cons and Considerations
==
): This operator checks if the two values are equal, but also allows for type coercion. For example, 5 == '5'
would return true.===
): This operator checks if both the value and the type are equal.Alternatives
In this case, there aren't any alternative equality operators being compared. However, when choosing between ==
and ===
, you can consider the following alternatives:
===
whenever possible to ensure strict equality checks.==
only when you explicitly want to allow for type coercion or are working with legacy code.Results
The latest benchmark results show that:
test equality
case (using ==
) executes at approximately 6,300 executions per second.test strict equality
case (using ===
) executes at slightly lower speed than the first case, around 6,294 executions per second.string to int
case attempts to compare a string with an integer using ==
, which is not a valid comparison and will likely throw an error. As expected, this test case performs poorly, executing at approximately 881 executions per second.Overall, the results suggest that there might be a small performance difference between using ==
and ===
in some cases, but it's likely negligible for most practical purposes.