<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>
var x = 5.236;
for (var i = 0; i < 1000; i++) {
_.round(x,2);
}
for (var i = 0; i < 1000; i++) {
Math.round(x*100)/100;
}
for (var i = 0; i < 1000; i++) {
parseFloat(x.toFixed(2));
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Round floating number using lodash round function | |
Round floating number using toFixed() | |
Round floating number using toFixed() and parseFloat |
Test name | Executions per second |
---|---|
Round floating number using lodash round function | 1260.9 Ops/sec |
Round floating number using toFixed() | 5012.3 Ops/sec |
Round floating number using toFixed() and parseFloat | 2555.2 Ops/sec |
Let's dive into the explanation of the provided benchmark.
Benchmark Definition:
The benchmark compares three approaches to round a floating-point number:
round
from the Lodash librarytoFixed()
followed by parseFloat
Math.round()
Options Compared:
The benchmark is comparing the performance of these three approaches on a specific input value, x = 5.236
. The options are compared in terms of execution time.
Pros and Cons of Each Approach:
round
function:toFixed()
followed by parseFloat
:Math.round()
function:toFixed()
followed by parseFloat
)Library Used:
The Lodash library is used in the benchmark. Lodash is a popular utility library for JavaScript that provides a wide range of functions for tasks such as array manipulation, string manipulation, and more.
Special JS Feature/Syntax:
None mentioned explicitly in this benchmark.
Other Considerations:
When dealing with floating-point numbers, it's essential to consider precision issues. The toFixed()
followed by parseFloat
approach can lead to precision errors if not used carefully. In contrast, the Lodash round
function is designed to handle negative numbers and decimals more accurately.
Alternatives:
Other alternatives for rounding a floating-point number in JavaScript include:
Number.prototype.round()
: Introduced in ECMAScript 2022, this method provides a faster and more accurate way to round numbers.In summary, the benchmark provides valuable insights into the performance of different approaches for rounding floating-point numbers in JavaScript. The choice of approach depends on the specific requirements, trade-offs between speed, accuracy, and readability, and consideration of potential precision issues.