var brands = [
"Mastercard",
"Visa",
"AmericanExpress",
"DinersClub",
"Discover",
"JCB",
"UnionPay"
]
var brand = brands[Math.floor(Math.random() * 7)];
var map = {
Mastercard:"Mastercard",
Visa:"Visa",
AmericanExpress:"American Express",
DinersClub: "Diners Club",
Discover: "Discover",
JCB: "JCB",
UnionPay:"UnionPay",
}
map[brand]
switch (brand) {
case "Mastercard":
return "Mastercard";
case "Visa":
return "Visa";
case "American Express":
return "AmericanExpress";
case "Diners Club":
return "DinersClub";
case "Discover":
return "Discover";
case "JCB":
return "Jcb";
case "UnionPay":
return "UnionPay";
default:
return "UnknownCard";
}
--enable-precise-memory-info
flag.
Test case name | Result |
---|---|
Object literal | |
Switch |
Test name | Executions per second |
---|---|
Object literal | 2025288.9 Ops/sec |
Switch | 2022408.9 Ops/sec |
The provided JSON represents a JavaScript microbenchmark test case on the MeasureThat.net website. The test case is designed to measure the performance difference between two approaches: object literal and switch statement.
What's being tested?
The test case creates an array of strings representing different credit card brands, selects a random brand from the array using Math.random()
, and then uses this selected brand to access a value in a map (object literal) or a series of cases in a switch statement. The goal is to measure which approach is faster.
Options being compared
The two options being compared are:
Pros and Cons of each approach:
Library used
There is no explicitly mentioned library in this test case. However, it's worth noting that using a library like map
or Object.keys()
can provide a more convenient and readable way to perform lookups.
Special JS feature/syntax: None mentioned
Neither object literal nor switch statement require any special JavaScript features or syntax beyond standard ES6 syntax.
Other alternatives
For this specific test case, alternative approaches could include:
in
operator: Instead of using a map or object literal, you could use the in
operator to check if the brand is present in an array of strings.However, these alternatives might not be as straightforward or readable as using a map or switch statement.
In summary, the test case is designed to measure the performance difference between two common approaches for accessing values in JavaScript: object literals and switch statements.