const params = { "foo": [], "bar": [], "baz":[] };
const newObj = Object.assign({}, params);
newObj.foo = "FOO";
return newObj;
const params = { "foo": [], "bar": [], "baz":[] };
return {params, foo: "FOO",}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Array.prototype.concat | |
spread operator |
Test name | Executions per second |
---|---|
Array.prototype.concat | 940068.9 Ops/sec |
spread operator | 1326741.8 Ops/sec |
Let's dive into the world of MeasureThat.net and explore what's being tested in this benchmark.
Benchmark Overview
The benchmark is designed to compare two approaches for creating a new object by copying an existing one: Array.prototype.concat
(traditional method) and the ES6 spread operator (...
). The goal is to determine which approach is faster, more efficient, or both.
Options Compared
Two options are being compared:
concat()
function to create a new array by concatenating multiple arrays....
): This new feature allows creating a new object by spreading an existing object into the desired form.Pros and Cons of Each Approach
Here's a brief summary of the pros and cons of each approach:
...
):Library Usage
None of the test cases uses any external libraries. The Object.assign()
function is used in both benchmarks to create a new object by copying an existing one.
Special JS Feature/Syntax
The ES6 spread operator (...
) is a relatively new feature introduced in ECMAScript 2015 (ES6). It allows creating a new object by spreading an existing object into the desired form, making it a concise alternative to traditional object creation methods.
Other Alternatives
Before settling on these two approaches, other alternatives could have been considered:
Object.create()
: This method creates a new object with respect to the given prototype.Keep in mind that these alternative approaches might not be as concise or efficient as the spread operator or concat()
method.
The benchmark seems well-structured and focuses on comparing two fundamental aspects of JavaScript: traditional array manipulation (concat()
) versus modern object creation with the spread operator.