let b = {
'a': 1
};
function a (mutable) {
return mutable.a = 5;
};
a(b);
let b = {
'a': 1
};
function a (mutable) {
mutable.a = 5;
return;
}
a(b);
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Inline return | |
Newline return |
Test name | Executions per second |
---|---|
Inline return | 1668976640.0 Ops/sec |
Newline return | 1672454400.0 Ops/sec |
Let's dive into the world of JavaScript microbenchmarks.
What is being tested?
The provided JSON represents two test cases that measure the performance difference between inline returns and newline-defined returns in JavaScript. Specifically, they test how browsers handle function return statements with or without a newline character.
Options compared:
Two options are compared:
function
body, without any explicit newline character.\n
) is added before the return statement.Pros and Cons:
Library/Functionality used:
None of the test cases use a specific library. However, the let
keyword and object literals (e.g., { 'a': 1 }
) are part of the ECMAScript standard, so they don't require any external libraries.
JavaScript feature/Syntax:
The test cases demonstrate the use of implicit function return values in JavaScript. In both cases, when the function is called, it will implicitly return undefined
if no value is specified. This behavior is specific to JavaScript and is not universally supported by other programming languages.
Other alternatives:
To explore different approaches or measure alternative scenarios, you could consider modifying the benchmark code to:
Keep in mind that these modifications should be done with caution and thorough testing to ensure accurate results.