let num = 500;
let nums = [];
for(let i = 0; i < 100; ++i) {
nums.push(num+'');
}
let num = 500;
let nums = [];
for(let i = 0; i < 100; ++i) {
nums.push(num.toString());
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
String() | |
.toString() |
Test name | Executions per second |
---|---|
String() | 5139344.0 Ops/sec |
.toString() | 1516883.1 Ops/sec |
I'll break down the provided benchmark and explain what's being tested, compared, and analyzed.
Benchmark Overview
The provided JSON represents a JavaScript microbenchmark on MeasureThat.net. The benchmark compares two approaches to concatenate strings: using the +
operator (string concatenation) versus calling the .toString()
method.
Test Cases
There are two test cases:
.toString()
method on the number 500 instead of using string concatenation.Comparison
The benchmark compares the performance of these two approaches:
+
operator to concatenate strings. For example: num + ''
..toString()
method on the number 500, which returns a string representation of the number: 500.toString()
.Pros and Cons
Here's a brief analysis of each approach:
Library and Special Features
Neither test case uses any external libraries or special JavaScript features beyond the standard String
type and basic syntax. The .toString()
method is a built-in method on the Number
type that returns a string representation of the number.
Other Alternatives
If you wanted to modify this benchmark, here are some alternative approaches you could consider:
push
method with a template literal (e.g., [...nums, num]
) or using a library like Lodash's repeat
function.slice()
or substring()
.I hope this explanation helps!