npm install variator
Prefix based method dispatch is an extendable alternative to imperative
[switch][] statements.
``js
var variator = require("variator")
var price = variator("price")
price.define("Oranges", function(fruit, pound) {
var n = pound || 1
return "Total price for " + fruit + " is $" + n * 0.59
})
price.define("Apples", function(fruit, pound) {
var n = pound || 1
return "Total price for " + fruit + " is $" + n * 0.32
})
price("Oranges") // => "Total price for Oranges is $1"
price("Apples", 5) // => "Total price for Apples is $1.6"
// Errors are thrown for unknown cases:
price("Cherries", 2) // => TypeError: Method price#0hq76f not implemented for: Cherries
// Although new cases can be defined
price.define("Cherries", function(fruit, pound) {
var n = pound || 1
return "Total price for " + fruit + " is $" + n * 3.00
})
price("Cherries", 2) // => "Total price for Cherries is $6"
``
npm install variator
[switch]:https://developer.mozilla.org/en-US/docs/JavaScript/Reference/Statements/switch